Best Solar Companies for Battery Storage and Backup Power Systems (2026)

The research in brief

Sunrun is the consensus leader for solar plus battery backup installation in this 7-platform study, named by 5 of 7 platforms (71.4% share) at an average listed position of 1.2 and a best position of 1. Tesla ranks second (4 mentions, 57.1%, average 2.0), and Blue Raven Solar third (3 mentions, 42.9%, average 4.33). For distinct buyer needs, Tesla is the strongest alternative for integrated hardware and high continuous backup output, Blue Raven Solar for Enphase-centered solar-plus-storage, Rooftop Power Co for Southern New England homeowners wanting in-house crews and optional generator pairing, Momentum Solar for Enphase-based turnkey installation, Palmetto for $0-down battery leasing, Semper Solaris for California dual-brand (Enphase/Tesla) installation, Pennstar Solar for Southeastern Pennsylvania multi-brand design, and SolarEdge for a single-vendor inverter-battery-backup ecosystem. The principal limitation: this index reflects one standardized prompt sent once to each of 7 AI platforms on 2026-09-30, and platform answers vary by date, wording, location, account state, model, interface, browsing configuration, and retrieved sources.

Research Snapshot

• Topic: Best solar and battery storage companies for solar plus battery backup installation
• Target buyer: A homeowner who has experienced repeated power outages and wants a new solar system paired with a home battery to keep essential appliances running during a blackout, prioritizing backup capacity design, correct battery sizing, and reliable switchover integration
• Platforms included (7): ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, Gemini
• Research date: 2026-09-30 (authoritative run date)
• Unique entities named across platforms: 37
• Qualifying entities (named by at least two platforms): 9
• Eligibility rule: An entity qualified for this index only if it was named by at least two of the 7 included platforms during ranking discovery
• Geography: United States
• Ranking unit: Solar and battery storage installation company

Platform-reported research dates were not uniform. Deepseek reported 2026-01-15 for most entities (2026-06-01 for Rooftop Power Co, 2026-06-11 for Momentum Solar and Semper Solaris, and 2025-04-11 for SolarEdge), and Claude reported 2026-01-15 for Blue Raven Solar. These dates are provenance metadata and do not independently prove freshness; the study date used throughout is 2026-09-30.

The Consensus Ranking

Questions explored

• What are the best solar and battery storage companies for solar plus battery backup installation in 2026?
• Which solar-plus-battery installer was named by the most AI platforms for blackout protection?

The table below is the sole authority for rank, platform mentions, platform share, average listed position, and best position. Platform mentions count only ranking-discovery mentions; they do not represent the number of platforms that later completed a fit assessment.

Which provider fits your needs?

Questions explored

• Which solar-plus-battery installer should a homeowner choose if they want $0 down and no maintenance responsibility?
• Is Tesla or Sunrun better for whole-home backup when high continuous power matters?
• Which installer is best for a homeowner who already has Enphase solar equipment and wants to add a battery?

1. Sunrun

Questions explored

• Is Sunrun worth it for solar plus battery backup, and what are its main drawbacks?
• Which solar-plus-battery company has the lowest published upfront cost for a homeowner who wants a lease or subscription?
• What should a buyer check before signing a Sunrun lease or PPA for blackout protection?

Sunrun is the consensus leader of this index: 5 of 7 platforms named it, at an average listed position of 1.2 and a best position of 1. It is a good fit for homeowners who want turnkey blackout protection with professional design, monitoring, and service rather than lowest lifetime cost or maximum equipment-choice flexibility ^[156]. The fit is strongest where Sunrun offers Tesla Powerwall 3, the proposed backup design covers the buyer's critical loads, and the buyer accepts a long-term subscription, lease, PPA, or service arrangement.

Why it ranked here. Sunrun was ranked first by Claude, DeepSeek, Gemini, and Perplexity, and second by ChatGPT. Its scale, battery partnerships, and financing breadth recur across every platform bundle. Anthropic reported 266,000+ installed storage and solar systems as of June 2026 with 4.6 GWh of networked storage capacity and a 74% storage attachment rate in Q2 2026 ^[319]. Google cited a 25-year comprehensive warranty covering equipment maintenance, repairs, and battery replacements under Subscription and Protection Plus plans ^[154].

Best suited for. Homeowners wanting solar, battery storage, installation, monitoring, maintenance, and outage support from one provider; buyers preferring little or no upfront payment through a subscription, lease, or PPA; homeowners in markets where Sunrun can install Tesla Powerwall 3 and design sufficient capacity for critical loads.

Main strengths for this use case. Sunrun states it partners with Tesla and Lunar Energy and offers Tesla Powerwall 3 and Lunar Energy Battery products, with availability depending on location, eligibility, and package ^[147]. Tesla Powerwall 3 provides 13.5 kWh of nominal energy and up to 11.5 kW of continuous backup power per Tesla's specifications ^[16]. Sunrun states that battery equipment is covered by Sunrun or the manufacturer for at least 10 years, depending on location and package, and eligible Subscription and Protection Plus plans advertise monitoring, maintenance, repairs, and battery-health coverage ^[156]. Anthropic reported that lease and subscription customers receive 25-year comprehensive warranty coverage including repair or replacement if the battery falls below warrantied performance ^[145].

2. Tesla

Questions explored

• Is Tesla worth it for solar plus battery backup, and what are its main drawbacks?
• Is Tesla or Sunrun better for whole-home backup when high continuous power and motor-start capability matter?
• What should a buyer verify before ordering a Tesla Powerwall 3 system for blackout protection?

Tesla ranked second: 4 of 7 platforms named it, at an average listed position of 2.0 and a best position of 1. It is a good fit for a homeowner prioritizing blackout protection when the buyer wants a tightly integrated solar-and-battery system, whole-home or partial-home backup design, app monitoring, and a scalable battery platform ^[161]. It is not an unequivocally strong fit because installed pricing is address-specific, installer quality and availability vary by market, utility approval is required for some backup equipment, and a single 13.5 kWh battery may not sustain high household loads for long outages.

Why it ranked here. Tesla was ranked first by ChatGPT, second by DeepSeek and Gemini, and third by Claude. Its Powerwall 3 hardware specifications - 13.5 kWh nominal energy, configurable continuous output up to 11.5 kW, integrated solar inverter, and up to four units per system - recur across every platform bundle ^[19]. Google cited a 185 A locked rotor amps (LRA) motor-start capability and LFP chemistry at roughly 13% below the market average battery price ^[162].

Best suited for. Homeowners seeking an integrated solar, inverter, battery, gateway, and monitoring ecosystem; homes needing automatic outage isolation and whole-home backup where the electrical service and utility permit the required configuration; buyers who may expand storage later with additional Powerwall 3 units or Powerwall 3 Expansion units.

Main strengths for this use case. Powerwall 3 includes an integrated solar inverter and can accept up to 20 kW of solar STC input through six MPPTs, according to Tesla technical documentation ^[19]. Tesla states that Powerwall with Backup Gateway, Backup Switch, or Gateway 3 automatically disconnects the home from the grid and supplies backup power during an outage ^[168]. The U.S. Powerwall warranty is 10 years with 70% retained capacity at 10 years for solar self-consumption, time-based control, and backup, with unlimited cycles under that use category ^[22]. Tesla lists 89% solar-to-battery-to-home/grid round-trip efficiency for a typical solar-shifting use case and 97.5% solar-to-home/grid efficiency under its stated test methodology ^[19].

3. Blue Raven Solar

Questions explored

• Is Blue Raven Solar worth it for solar plus battery backup, and what are its main drawbacks?
• Which solar-plus-battery installer should a homeowner choose if they already have Enphase microinverters and want modular battery expansion?
• What should a buyer verify about Blue Raven Solar's battery warranty and corporate ownership before signing?

Blue Raven Solar ranked third: 3 of 7 platforms named it, at an average listed position of 4.33 and a best position of 1. It is a mixed fit for a homeowner whose primary goal is dependable blackout protection. It publicly discusses Enphase battery storage and grid-outage operation, but publicly available information does not establish a current, standardized Blue Raven battery package, guaranteed whole-home backup design, current battery warranty terms, or demonstrated outage-performance results for every market ^[5].

Why it ranked here. Blue Raven was ranked first by Grok and sixth by both DeepSeek and Gemini. Grok cited the Enphase IQ Battery 5P with a 15-year limited warranty and modular design ^[8]. Google cited partnerships with Tesla Powerwall 3, Franklin Home Power, and Enphase IQ Battery, installed by in-house employees rather than third-party contractors ^[257]. Deepseek and Kimi both rated the fit uncertain because battery-specific documentation was thin.

Best suited for. Homeowners who want one installer for rooftop solar and an Enphase-based storage system; existing or planned Enphase solar systems where AC-coupled battery integration and modular expansion are valuable; buyers willing to compare the detailed battery design, warranty, service obligations, and pricing against specialist storage installers.

Main strengths for this use case. Blue Raven publicly identifies the Enphase IQ Battery 5P as a battery option and describes battery storage as an available solution ^[5]. Blue Raven states that grid-connected solar shuts down during an outage and presents battery storage as the solution for continued backup power ^[4]. Anthropic reported a 5+ year relationship with Enphase on IQ8 microinverter systems, Tesla Certified and NABCEP certifications in multiple states, and 9,000+ installations since 2014 ^[200]. Google reported that Blue Raven relies entirely on fully trained, in-house employees for installation rather than third-party subcontractors ^[257]. Grok reported the Enphase IQ Battery 5P carries a 15-year limited warranty up to 6,000 cycles with 60% retention, and that Blue Raven provides 2-year service/workmanship support then assists with manufacturer claims ^[6].

4. Rooftop Power Co

Questions explored

• Is Rooftop Power Co worth it for solar plus battery backup in Rhode Island, Massachusetts, or Connecticut, and what are its main drawbacks?
• Which solar-plus-battery installer should a Southern New England homeowner choose if they want in-house crews and optional standby generator pairing?
• What should a buyer verify about Rooftop Power Co's Powerwall 3 design, warranty, and outage runtime before signing?

Rooftop Power Co ranked fourth: 2 of 7 platforms named it, at an average listed position of 3.5 and a best position of 2. It appears to be a good fit for a United States homeowner in Rhode Island, Massachusetts, or Connecticut who prioritizes blackout protection and wants solar, battery storage, electrical work, permitting, and possible generator integration from one regional installer ^[101]. The fit is not rated strong because the public information does not verify a fixed Powerwall 3 package, installed pricing, specific outage-runtime guarantees, or the company's exact workmanship and battery-service warranty terms.

Why it ranked here. Rooftop Power Co was ranked second by Kimi and fifth by Grok. Kimi's ranking reflects the company's regional focus and Powerwall 3 positioning; Grok's reflects the same regional scope with a lower overall position. Google rated the fit strong within the regional footprint, citing certified Tesla Powerwall installation with entirely in-house crews ^[101]. Deepseek rated the fit weak because the official site did not clearly document Tesla or other battery partnerships at the time of research ^[100].

Best suited for. Homeowners in Rhode Island, Massachusetts, or Connecticut seeking integrated solar and battery installation; essential-loads backup covering refrigeration, heating controls, water, lighting, communications, and similar circuits; homeowners wanting a whole-home design study with possible multiple batteries; homes needing battery and standby-generator coordination for potential multi-day outages.

Main strengths for this use case. Rooftop Power Co publicly identifies itself as Tesla Powerwall certified and promotes Tesla battery storage ^[101]. The company says it sizes around actual loads, outage history, solar recharge capability, and the distinction between essential-loads and whole-home backup, and that multiple battery units may be used when capacity or runtime requires them ^[101]. It markets standby generators alongside batteries and states that it can coordinate solar, battery, and generator transfer schemes for long outages ^[103]. The company claims its own licensed electricians perform battery installation, panel or subpanel work, load calculations, permits, inspections, commissioning, and monitoring setup in its service states ^[101].

5. Momentum Solar

Questions explored

• Is Momentum Solar worth it for solar plus battery backup, and what are its main drawbacks?
• Which solar-plus-battery installer should a homeowner choose if they want one contractor for solar, Enphase storage, commissioning, and monitoring?
• What should a buyer verify about Momentum Solar's battery model, warranty, and service response times before signing?

Momentum Solar ranked fifth: 2 of 7 platforms named it, at an average listed position of 3.5 and a best position of 3. It is a good but quote-dependent fit for homeowners seeking integrated solar and battery backup, particularly where Momentum can provide an Enphase-based system with correctly sized whole-home or critical-load backup ^[42]. The battery technology and warranty are well documented, but Momentum's public information does not establish uniform availability, pricing, installation quality, outage results, or storage warranty administration across all U.S. markets.

Why it ranked here. Momentum was ranked third by ChatGPT and fourth by DeepSeek. Openai cited the Enphase partnership and documented IQ Battery specifications; DeepSeek cited the same offering but flagged a reported 2024 Chapter 11 bankruptcy filing as a counterparty risk ^[309]. Anthropic rated the fit mixed, citing severe documented service delays ^[261].

Best suited for. Homeowners wanting one contractor for solar, Enphase storage, commissioning, and monitoring; new Enphase solar installations or homes that already use compatible Enphase equipment; buyers prioritizing modular expansion, app monitoring, and a long manufacturer battery warranty.

Main strengths for this use case. Momentum markets an Enphase partnership and describes integrated solar-plus-storage systems using Enphase storage equipment ^[42]. Current IQ Battery 5P provides 5.0 kWh and 3.84 kW continuous output; IQ Battery 10C provides 10.0 kWh and 7.08 kW continuous output ^[31]. Enphase's published U.S. warranties for IQ Battery 5P and IQ Battery 10C provide coverage for the earlier of 15 years or 6,000 discharged cycles, with capacity-retention thresholds including at least 70% at year 10 and 60% at year 15 for the 5P ^[28]. Anthropic reported a 25-year workmanship and equipment warranty for purchased systems and a 5-year roof penetration warranty ^[291]. Google reported that Momentum acts as a full-service turnkey contractor handling system design, local permitting, utility interconnection, and certified installation ^[249].

Main limitations. Momentum's public battery page appears to describe earlier Encharge models, so the exact current model and availability are unclear ^[42].

6. Palmetto

Questions explored

• Is Palmetto worth it for solar plus battery backup, and what are its main drawbacks?
• Which solar-plus-battery company has the lowest published monthly cost for a battery-only lease with no upfront payment?
• What should a buyer verify about Palmetto's battery model, backed-up circuits, and end-of-term obligations before signing?

Palmetto ranked sixth: 2 of 7 platforms named it, at an average listed position of 4.0 and a best position of 3. It is a good fit for homeowners prioritizing a turnkey, no-upfront-cost battery backup system and predictable service coverage, but only a mixed fit for buyers requiring clearly disclosed whole-home backup, guaranteed outage runtime, ownership, or highly transparent long-term pricing ^[36].

Why it ranked here. Palmetto was ranked third by DeepSeek and fifth by Perplexity. Both cited the Energy Backup lease structure and multi-brand battery approach. Anthropic and Grok rated the fit good; Gemini, Perplexity, and DeepSeek rated it mixed; Kimi rated it uncertain because battery hardware brands and specifications were not transparently disclosed in accessible sources ^[61].

Best suited for. Homeowners seeking $0-down battery installation with maintenance and repairs handled by the provider; buyers comfortable leasing or subscribing to storage for a 10- or 12-year term; homes needing designated-circuit backup or a professionally designed system using Tesla, Enphase, or SolarEdge equipment; existing Palmetto or third-party solar customers whose electrical configuration is compatible with an AC-coupled retrofit.

Main strengths for this use case. Palmetto LightReach's published approved-vendor list identifies Tesla Powerwall 3 and Powerwall Expansion, Enphase IQ Battery 10C, and SolarEdge Nexis as approved Energy Backup batteries ^[35]. For the Energy Backup lease, Palmetto LightReach states that major maintenance, repairs, and warranty coverage apply for the signed 10- or 12-year term ^[36]. Energy Backup is described as an AC-coupled installation connected to the home's electrical system rather than modifying the existing PV modules, inverter, or DC wiring ^[40]. Anthropic reported that parts, labor, repairs, replacements, and full warranty coverage apply for the entire lease term, including coverage beyond the OEM warranty period ^[62]. Google reported that the lease is AC-coupled and fully standalone, meaning it can be added to homes with existing solar of any financing type without altering the pre-existing system ^[75].

7. Semper Solaris

Questions explored

• Is Semper Solaris worth it for solar plus battery backup in California, and what are its main drawbacks?
• Which California solar-plus-battery installer should a homeowner choose if they want both Enphase and Tesla storage options?
• What should a buyer verify about Semper Solaris's battery warranty, service response times, and contract terms before signing?

Semper Solaris ranked seventh: 2 of 7 platforms named it, at an average listed position of 4.0 and a best position of 3. It is a good, but not clearly strongest, fit for a California homeowner prioritizing blackout protection. It publicly offers Enphase and Tesla battery systems, advertises whole-home or modular backup, and has a documented Enphase partnership ^[116]. However, project-specific battery capacity, critical-load design, outage duration, installed pricing, contract economics, and the exact terms of the advertised lifetime/full-backup guarantees are not sufficiently disclosed publicly.

Why it ranked here. Semper Solaris was ranked third by Perplexity and fifth by Gemini. Both cited the Enphase partnership and dual-brand battery options. Anthropic and ChatGPT rated the fit good; DeepSeek and Grok rated it mixed; Kimi rated it uncertain because no independent or company-source evidence about its battery partnerships, backup capacity design, outage performance, integration expertise, or storage warranty was retrievable on 2026-09-30 ^[66].

Best suited for. California homeowners seeking an installer that can offer both Enphase and Tesla storage options; homeowners wanting an integrated new solar-plus-storage installation rather than a battery-only purchase; buyers who value local California coverage, financing options, and potential PPA structures.

Main strengths for this use case. Semper Solaris states that it offers Tesla Powerwall and Enphase battery systems, and Enphase independently announced a California partnership with Semper Solaris for solar and battery sales ^[116]. The company's battery page describes Enphase as modular and suited to integration with Enphase solar, and its warranty page lists an Enphase 10-year limited warranty ^[126]. PanelCensus reports 36,647 recorded Semper Solaris installations through December 31, 2025, with a 22% battery-attach rate ^[213]. Google reported an expanded strategic relationship with Enphase Energy to install the third-generation Enphase Energy System, featuring IQ8 Microinverters and IQ Battery 5P ^[189]. Google also reported the Semper 360 bundle combining solar, battery backup, cool roofing technology, and energy-efficient HVAC upgrades ^[290].

8. Pennstar Solar

Questions explored

• Is Pennstar Solar worth it for solar plus battery backup in Southeastern Pennsylvania, and what are its main drawbacks?
• Which solar-plus-battery installer should a Philadelphia-area homeowner choose if they want multi-brand battery design and architecture-matched recommendations?
• What should a buyer verify about Pennstar Solar's battery pricing, workmanship warranty, and service area before signing?

Pennstar Solar ranked eighth: 2 of 7 platforms named it, at an average listed position of 5.0 and a best position of 5. It appears to be a good fit for a Southeastern Pennsylvania homeowner prioritizing blackout protection because it publicly advertises whole-home or critical-load battery designs, automatic backup, multiple battery brands, design and permitting support, and a five-year workmanship guarantee ^[305]. The fit is not rated strong because public information does not establish independently verified outage-performance results, project-specific backup sizing quality, published installed pricing, or the precise scope of manufacturer warranty administration.

Why it ranked here. Pennstar Solar was ranked fifth by both Kimi and ChatGPT. Both cited the multi-brand battery portfolio and architecture-matched design guidance. Anthropic, Gemini, Kimi, ChatGPT, and Perplexity rated the fit good; Grok rated it strong; DeepSeek rated it uncertain because the official website was unreachable during research ^[85].

Best suited for. Homeowners in the greater Philadelphia and Southeastern Pennsylvania service area seeking a locally managed solar-plus-storage installation; new solar installations where a DC-coupled Tesla Powerwall 3 or Sigenergy system may be appropriate; existing Enphase systems needing an Enphase IQ Battery retrofit; existing non-Enphase solar systems where FranklinWH, Sol-Ark, EG4, or another compatible AC-coupled or hybrid architecture may be evaluated; buyers interested in whole-home backup, critical-load backup, or potential Sigenergy vehicle-to-home capability.

Main strengths for this use case. Pennstar states that it is a certified installer for Tesla Powerwall, Enphase, Sol-Ark, EG4, Sigenergy, FranklinWH, and Fortress systems, and its comparison page specifically discusses Tesla Powerwall 3, Sigenergy SigenStor, FranklinWH aPower 2, and Enphase IQ Battery ^[305]. Pennstar advertises whole-home or critical-load backup and says it designs systems around the home's backup needs, distinguishing DC-coupled systems for new solar installations, Enphase for existing Enphase microinverter systems, and FranklinWH as an AC-coupled retrofit option ^[305]. Pennstar states that projects include design, permitting, and PECO interconnection, and that physical installation typically takes one to three days with a total process of approximately six to ten weeks ^[95]. Pennstar states that every installation includes a five-year workmanship guarantee ^[95].

9. SolarEdge

Questions explored

• Is SolarEdge worth it for solar plus battery backup, and what are its main drawbacks?
• Which solar-plus-battery system should a homeowner choose if they want a single-vendor inverter, battery, monitoring, and backup ecosystem?
• What should a buyer verify about SolarEdge's Nexis compatibility, backup power output, and warranty conditions before signing?

SolarEdge ranked ninth: 2 of 7 platforms named it, at an average listed position of 6.5 and a best position of 6. It is a good fit for a homeowner seeking integrated solar-plus-battery backup, especially where a certified installer can correctly size partial or whole-home backup and the homeowner values a single-vendor inverter, battery, monitoring, and support ecosystem ^[134]. It is not an automatic best fit because backup output, supported equipment, local rules, installer quality, and system pricing are site-specific, and the requested Nexis/Home Battery/Home Hub combination requires compatibility confirmation.

Why it ranked here. SolarEdge was ranked sixth by Claude and seventh by DeepSeek. Both cited the integrated battery-backup architecture and published warranty terms. Anthropic, Gemini, Kimi, ChatGPT, and Perplexity rated the fit good; Grok rated it mixed; DeepSeek rated it uncertain because official pages for the SolarEdge Home Battery and Nexis inverter were not retrieved ^[67].

Best suited for. Homeowners wanting integrated SolarEdge solar, battery, inverter, monitoring, and backup controls; homes needing partial-home backup or a designed whole-home backup system; buyers who value DC-coupled architecture, scalable battery capacity, and a single manufacturer warranty/support channel.

Main strengths for this use case. SolarEdge states that full or partial backup requires the SolarEdge Home Battery, a SolarEdge Home Hub Inverter, and the SolarEdge Home Backup Interface; the interface automatically disconnects backed-up loads from the grid during an outage ^[134]. The Home Battery 400V is specified at 9.7 kWh per battery, with up to three batteries per inverter, 5 kW continuous and 7.5 kW peak battery output, while the Home Hub datasheet lists up to 12.5 kW continuous charge/discharge capability for the inverter ^[135]. The SolarEdge Home Battery 400V warranty effective January 1, 2026 provides 10 years of coverage and 70% energy retention at the end of the warranty period, with unlimited cycles for standard solar use ^[48]. SolarEdge states that the Home Backup Interface includes a 12-year warranty, including its inline meter and auto-transformer components ^[134]. SolarEdge markets the Home Battery as DC-coupled with 94.5% round-trip efficiency and integrated monitoring and control through mySolarEdge ^[53].

What this study reveals

Questions explored

• What does the cross-platform AI study reveal about how solar-plus-battery installers are recommended for blackout protection?
• Which battery brands and architectures dominate AI platform recommendations for solar plus battery backup installation?

Three patterns dominate this market as reflected in the platform bundles.

First, battery brand partnerships are the primary sorting mechanism. Tesla Powerwall 3 appears in the evidence bundles for Sunrun, Tesla, Blue Raven Solar, Rooftop Power Co, Momentum Solar (via Enphase alternatives), Palmetto, Semper Solaris, Pennstar Solar, and SolarEdge (as a competitor reference). Enphase IQ Battery appears in the bundles for Blue Raven Solar, Momentum Solar, Palmetto, Semper Solaris, and Pennstar Solar. Lunar Energy appears for Sunrun. FranklinWH appears for Blue Raven Solar, Pennstar Solar, and as a competitor reference for Tesla and SolarEdge. The platforms consistently treat named battery partnerships as evidence of integration capability, and treat the absence of a named battery partner as a limitation.

Second, ownership structure is the sharpest dividing line. Sunrun and Palmetto are recommended primarily through lease, subscription, or PPA structures with $0 to little down. Tesla, SolarEdge, and Pennstar Solar are recommended primarily through purchase or loan structures. Blue Raven Solar, Momentum Solar, and Semper Solaris appear in both.

Where the AI Platforms Agreed

Questions explored

• Which solar-plus-battery installers did all AI platforms agree on for blackout protection?
• What did the AI platforms agree on about battery sizing and backup design for outage protection?

The platforms agreed on several points.

Sunrun is the consensus leader. Five of seven platforms named Sunrun, and four ranked it first. No platform rated Sunrun below good. The recurring rationale is turnkey delivery, Tesla Powerwall 3 availability, and bundled monitoring and service.

Tesla Powerwall 3 is the reference battery. Every platform bundle that discusses battery hardware references Powerwall 3 specifications: 13.5 kWh nominal energy, configurable continuous output up to 11.5 kW, integrated solar inverter, and 10-year warranty with 70% capacity retention ^[19].

Battery energy capacity is not the same as outage runtime. Openai, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini all state or imply that actual outage duration depends on household load, battery count, solar production, weather, and reserve settings. No platform claims a universal runtime guarantee.

Whole-home backup usually requires more than one battery. Anthropic reported that two Powerwall 3 units (27 kWh, 23 kW) are recommended for true whole-home backup in most houses ^[198].

Where the AI Platforms Disagreed

Questions explored

• Where did the AI platforms disagree about solar-plus-battery installers for blackout protection?
• Which solar-plus-battery installer had the widest disagreement among AI platforms about fit?

The platforms disagreed on several material points.

Fit ratings diverged sharply for several entities. Sunrun was rated good by six platforms and mixed by Kimi. Tesla was rated strong by three platforms, good by three, and mixed by one. Blue Raven Solar was rated good by two, mixed by three, and uncertain by two. Rooftop Power Co was rated strong by one, good by four, weak by one, and uncertain by one. Momentum Solar was rated good by two, mixed by three, and uncertain by two. Palmetto was rated good by three, mixed by three, and uncertain by one. Semper Solaris was rated good by four, mixed by two, and uncertain by one. Pennstar Solar was rated strong by one, good by five, and uncertain by one. SolarEdge was rated good by five, mixed by one, and uncertain by one.

Battery chemistry was reported inconsistently for Tesla and SolarEdge. Anthropic stated NMC chemistry for Powerwall 3 ^[202], while Kimi and Gemini reported LFP ^[305].

How to compare your options

Questions explored

• What should a homeowner check before choosing a solar-plus-battery installer for blackout protection?
• Which solar-plus-battery installer should a buyer choose if they want ownership and federal tax credit eligibility rather than a lease?

Buyers should work through five decisions in order.

1. Decide ownership versus lease first. This single choice eliminates or elevates entire categories of providers. Sunrun and Palmetto are built around lease, subscription, or PPA structures with $0 to little down. Tesla, SolarEdge, and Pennstar Solar are built around purchase or loan structures. Lease and PPA structures generally disqualify the homeowner from claiming the federal residential tax credit directly, and the federal Section 25D credit expired December 31, 2025 for homeowner-owned systems ^[296].

2. Match the battery platform to your existing or planned solar equipment. If you already have Enphase microinverters, Blue Raven Solar, Momentum Solar, and Pennstar Solar all publicly support Enphase IQ Battery integration. If you already have SolarEdge inverters, SolarEdge's Home Battery and Backup Interface are the native path. If you have non-Enphase, non-SolarEdge solar, Pennstar Solar explicitly positions FranklinWH as an AC-coupled retrofit option ^[305].

**3.

Methodology

This index was produced from a single standardized research prompt sent once to each of 7 included AI platforms on 2026-09-30. The prompt described a homeowner who has experienced repeated power outages and wants to pair a new solar system with a home battery to keep essential appliances running during a blackout, prioritizing backup capacity design, correct battery sizing, and reliable switchover integration. The prompt asked which providers the platform would recommend and why.

The 7 included platforms were ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. Platform configurations varied: ChatGPT used gpt-5.6-luna with native search; Claude used claude-haiku-4-5-20251001 with native search; DeepSeek used deepseek-v4-flash with search disabled; Grok used x-ai/grok-4.3 with server-tool search; Perplexity used perplexity/sonar with native options; Kimi used moonshotai/kimi-k2.6 with a web plugin; and Gemini used gemini-3.5-flash with native search.

Entities were extracted from platform responses and deduplicated. An entity qualified for the final ranking only if it was named by at least two of the 7 included platforms during ranking discovery. The final ranking order was determined by platform mentions first, then average listed position, then best listed rank. The final ranking table is the sole authority for rank, platform mentions, platform share, average listed position, and best position.

Research limitations

This study has several limitations that buyers should weigh.

Single prompt, single run. The study used one standardized prompt sent once to each included platform. AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved. A different prompt or a different day could produce a different ranking.

Platform-reported research dates differ from the authoritative run date. Deepseek reported 2026-01-15 for most entities (2026-06-01 for Rooftop Power Co, 2026-06-11 for Momentum Solar and Semper Solaris, and 2025-04-11 for SolarEdge). Anthropic reported 2026-01-15 for Blue Raven Solar. These dates are provenance metadata and do not independently prove freshness. The study date used throughout is 2026-09-30.

Platform mentions count only ranking-discovery mentions. All included platforms evaluated fit, but platform_mentions counts only platforms that named the entity during ranking discovery. An entity named by two platforms may have been evaluated for fit by more.

Citations are platform-reported evidence, not independently verified facts. No-search model claims require explicit verification before being described as current facts. Deepseek's research capability was configured with search disabled, so its claims rest on model knowledge rather than retrieved sources.

The consensus assessment

Sunrun is the consensus leader for solar plus battery backup installation in this 7-platform study, named by 5 of 7 platforms at an average listed position of 1.2. Its strongest case is turnkey delivery with Tesla Powerwall 3 availability, monitoring, and bundled service under an eligible plan. It is a weaker choice for buyers who prioritize transparent cash pricing, direct ownership, maximum installer and battery choice, or guaranteed whole-home and multi-day backup without first validating the exact design and written terms.

Tesla is the strongest alternative for buyers who want integrated hardware, high continuous backup output, and a scalable battery platform. Blue Raven Solar is the strongest alternative for Enphase-centered solar-plus-storage. Rooftop Power Co is the strongest alternative for Southern New England homeowners who want in-house crews and optional generator pairing. Momentum Solar is the strongest alternative for turnkey Enphase installation with one contractor. Palmetto is the strongest alternative for $0-down battery leasing. Semper Solaris is the strongest alternative for California homeowners who want both Enphase and Tesla storage options. Pennstar Solar is the strongest alternative for Southeastern Pennsylvania homeowners who want multi-brand battery design. SolarEdge is the strongest alternative for buyers who want a single-vendor inverter, battery, monitoring, and backup ecosystem.

Frequently Asked Questions

What is the best solar and battery storage company for solar plus battery backup installation in 2026?

Sunrun ranked first in this 7-platform study, named by 5 of 7 platforms at an average listed position of 1.2. Tesla ranked second (4 mentions, average 2.0), and Blue Raven Solar ranked third (3 mentions, average 4.33). The ranking reflects how often and how highly AI platforms named each entity for this specific use case, not verified installation quality.

How many platforms were studied?

Exactly 7 platforms were included: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. The study used one standardized prompt sent once to each platform on 2026-09-30.

How many entities qualified for the ranking?

37 unique entities were named across platforms, and 9 qualified for the final ranking by being named by at least two platforms.

Does a higher ranking mean better installation quality?

No. Platform recommendations are market intelligence, not independent customer reviews or proof of quality. A high ranking reflects how often and how highly AI platforms named an entity for this use case.

Sources used in this study

Company-Owned Sources

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28. Enphase IQ Battery 5P Warranty: https://enphase.com/download/iq-battery-5p-en-us-2024-10-01-warranty
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50. Limited Product Warranty SolarEdge Home Battery 48V: https://knowledge-center.solaredge.com/sites/kc/files/se-home-battery-48v-warranty.pdf
51. SolarEdge Home Hub Inverter Datasheet: https://knowledge-center.solaredge.com/sites/kc/files/se-home-hub-inverter-single-phase-inverter-made-in-usa-datasheet-nam.pdf
52. Home Hub Single Phase Inverter Supported Use Cases for Storage and Backup Installations: https://knowledge-center.solaredge.com/sites/kc/files/se-home-hub-single-phase-inverter-supported-use-cases-for-storage-and-backup-installations-application-note.pdf
53. SolarEdge Home Battery 400V Datasheet: https://knowledge-center.solaredge.com/sites/kc/files/se-solaredge-home-battery-datasheet-nam.pdf
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55. SolarEdge Solution Connections and Configuration Guide - AUS - Version 6.2: https://knowledge-center.solaredge.com/sites/kc/files/SolarEdge%20Solution%20Connections%20and%20Configuration%20Guide%20-%20AUS%20-%20Version%206.2.pdf
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60. Enphase Energy and Momentum Solar Expand Partnership to Include Battery Storage: https://newsroom.enphase.com/node/18776/pdf
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68. SolarEdge Home Backup Interface: https://solaredge.com/products/battery-storage/backup-interface
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103. Whole-Home Standby Generators in RI, MA and CT: https://www.rooftoppowerco.com/generators/
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117. Enphase Encharge Battery | Best Solar Battery Storage: https://www.sempersolaris.com/battery-storage/enphase/
118. Tesla Powerwall vs. Enphase: Which is Best for You?: https://www.sempersolaris.com/blog/tesla-powerwall-vs-enphase/
119. Solar & Battery Storage at no cost to you now available!: https://www.sempersolaris.com/free-solar-program/
120. Limited Time Solar Sale | No Payments for 18 months!: https://www.sempersolaris.com/limited-time-offer/
121. Semper Solaris Locations: https://www.sempersolaris.com/locations/
122. Semper Solaris San Diego Solar Installation: https://www.sempersolaris.com/locations/san-diego/
123. Semper Solaris Reviews | What Real Homeowners Are Saying: https://www.sempersolaris.com/reviews-testimonials/
124. Project Quebec: https://www.sempersolaris.com/semper-cares-initiative/missions/project-quebec/
125. Solar Loan & Financing Options in California | (888) 210-3366: https://www.sempersolaris.com/solar-panels/solar-incentives/
126. Warranty Coverage: https://www.sempersolaris.com/warranties/
127. Semper Solaris warranties page: https://www.sempersolaris.com/warranty/
128. SolarEdge Home Backup Interface Datasheet: https://www.solaredge.com/
129. SolarEdge 3-Phase Home Battery: https://www.solaredge.com/aus/products/residential/storage-and-backup/solaredge-3-phase-home-battery
130. SolarEdge Home Backup Interface: https://www.solaredge.com/en/products/residential/storage-and-backup/solaredge-home-backup-interface
131. Residential Solutions: SolarEdge Home Battery 48V: https://www.solaredge.com/en/products/residential/storage-and-backup/solaredge-home-battery-48v
132. Battery for Home: 5 Big Questions to Ask | SolarEdge Blog: https://www.solaredge.com/en/solaredge-blog/battery-for-home
133. Solar Storage & Backup Solutions: https://www.solaredge.com/us/products/residential/storage-and-backup
134. SolarEdge Home Backup Interface: https://www.solaredge.com/us/products/residential/storage-and-backup/solaredge-home-backup-interface
135. SolarEdge Home Battery 400V: https://www.solaredge.com/us/products/residential/storage-and-backup/solaredge-home-battery
136. Troubleshoot SolarEdge Energy Bank / Home Battery Backup: https://www.solaredge.com/us/support/system-owner/troubleshoot-solaredge-energy-bank
137. Official pricing and terms source: https://www.sunrun.com
138. Sunrun About: https://www.sunrun.com/about-sunrun
139. Add a Tesla Powerwall battery to your solar system: https://www.sunrun.com/add-a-battery
140. Sunrun Backup: https://www.sunrun.com/backup
141. ConnectedSolutions: https://www.sunrun.com/connectedsolutions
142. Solar Battery Backup Systems for Home | Sunrun: https://www.sunrun.com/go-solar-center/solar-articles/best-solar-battery-backup-for-homes
143. How Much Are Solar Batteries in 2026?: https://www.sunrun.com/go-solar-center/solar-articles/how-much-are-solar-batteries
144. Guide on the Differences of Solar PPA vs Lease | Sunrun: https://www.sunrun.com/go-solar-center/solar-articles/whats-a-solar-lease-or-ppa
145. Battery Backup & Solar FAQs: https://www.sunrun.com/go-solar-center/solar-faq
146. Home Battery Backup Explained: https://www.sunrun.com/learn-center-battery
147. Solar Battery Storage: https://www.sunrun.com/solar-battery-storage
148. Tesla Powerwall Backup Battery | Premium Installer | Sunrun: https://www.sunrun.com/solar-battery-storage/tesla-powerwall
149. Sunrun Solar Lease and PPA: https://www.sunrun.com/solar-lease
150. Sunrun Protection Plus: https://www.sunrun.com/solar-panel-protection-plus
151. Official pricing and terms source: https://www.sunrun.com/solar-plans-and-services
152. Official pricing and terms source: https://www.sunrun.com/solar-plans-and-services/monthly-solar-lease
153. Ownership Plans Sunrun: https://www.sunrun.com/solar-plans-and-services/owned-plans
154. Sunrun's Solar Warranty & Solar Guarantee: https://www.sunrun.com/solar-plans-and-services/warranty
155. 7-Steps to Solar: https://www.sunrun.com/why-sunrun
156. The Sunrun Guarantee: https://www.sunrun.com/why-sunrun/your-guarantee
157. Become a Certified Installer: https://www.tesla.com/partner-with-tesla
158. Tesla Powerwall 3 Official Product Page: https://www.tesla.com/powerwall
159. Tesla Powerwall 3 Order Page: https://www.tesla.com/powerwall/design
160. Tesla Certified Installer Program: https://www.tesla.com/solarpanels/design
161. How to Find a Certified Installer: https://www.tesla.com/support/energy/how-to-find-certified-installer
162. Powerwall 3 Technical Datasheet & Specifications: https://www.tesla.com/support/energy/powerwall/documents
163. Powerwall Pre-Installation: https://www.tesla.com/support/energy/powerwall/install/pre-installation
164. Powerwall Installation Documents: https://www.tesla.com/support/energy/powerwall/installer-resources/powerwall-installation-documents
165. Combining Systems with Powerwall: https://www.tesla.com/support/energy/powerwall/learn/combining-systems
166. How Powerwall Works | Tesla Support: https://www.tesla.com/support/energy/powerwall/learn/how-powerwall-works
167. Powerwall System Design: https://www.tesla.com/support/energy/powerwall/learn/system-design
168. Tesla Backup Switch: https://www.tesla.com/support/energy/powerwall/learn/tesla-backup-switch
169. What to Expect for Powerwall 3: https://www.tesla.com/support/energy/powerwall/learn/what-expect-powerwall-3
170. Order Powerwall: https://www.tesla.com/support/energy/powerwall/order/order-powerwall
171. Receive up to $1,000 for Your Powerwall System: https://www.tesla.com/support/energy/powerwall/order/rebate
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173. Frequently Asked Questions: https://www.tesla.com/support/energy/solar-panels/faqs/frequently-asked-questions
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329. Palmetto opens battery-only lease plan to all residential contractors: https://www.solarpowerworldonline.com/2026/07/palmetto-opens-battery-only-lease-plan-to-all-residential-contractors/
330. SolarEdge Home Battery Review: 9.7kWh, DC Coupled, Optional Backup: https://www.solarquotes.com.au/blog/solaredge-home-battery-review/
331. SolarEdge Backup Interface: Complete Guide: https://www.solarreviews.com/
332. Solar Reviews - Tesla Powerwall 3 Review: https://www.solarreviews.com/batteries/tesla-powerwall-3-review
333. The Actual Cost of a Tesla Powerwall: Is it Worth it? (2026 Data): https://www.solarreviews.com/blog/is-the-tesla-powerwall-the-best-solar-battery-available
334. Expert Review Of The New SolarEdge Battery: https://www.solarreviews.com/blog/solaredge-battery-complete-review
335. Expert Review Of The New SolarEdge Battery: https://www.solarreviews.com/blog/solaredge-energy-bank-battery-review
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337. Blue Raven Solar solar reviews, complaints, address & solar panels cost: https://www.solarreviews.com/installers/blue-raven-solar-reviews
338. Momentum Solar solar reviews, complaints, address & solar panels cost: https://www.solarreviews.com/installers/momentum-solar-nj-reviews
339. Semper Solaris solar reviews, complaints, address & solar panels cost: https://www.solarreviews.com/installers/semper-solaris-reviews
340. LightReach Solar + Battery California: https://www.solarwithwatts.com/lightreach-battery-lease
341. Solar Battery Backup for PSPS Outages - California 2026 | Solar With Watts: https://www.solarwithwatts.com/solar-battery-backup
342. Sunrun Solar Lease & PPA: Is It Predatory? An Honest Comparison After 3 Years of Mistakes: https://www.sunrunus.com/blog/sunrun-solar-lease-amp-ppa-is-it-predatory-an-honest-comparison-after-71.html
343. Blue Raven Solar: Spokane Solar Installer | SurgePV: https://www.surgepv.com/solar-installers/blue-raven-solar-spokane
344. SolarEdge Nexis residential inverter battery system launch details: https://www.thebatterymagazine.com/solaredge-launches-nexis-hybrid-inverter-and-high-voltage-battery-for-residential-solar/
345. Homeowner says Enphase batteries failed a sunny outage test when monitoring went down: https://www.thecooldown.com/green-tech/enphase-batteries-charging-issues-sunny-outage/
346. Tesla home battery hit 0 in an outage, and rooftop solar could not bring it back: https://www.thecooldown.com/green-tech/powerwall-3-solar-outage-homeowner-lesson/
347. Homeowner shares honest Tesla Powerwall review during first 'major power outage': 'The whole neighborhood is out': https://www.thecooldown.com/green-tech/powerwall-california-homeowner-battery-solar/
348. Tesla Powerwall 3 Specs: Capacity, Power, Efficiency, And Price (2026): https://www.thegreenwatt.com/tesla-powerwall-3-specs/
349. Blue Raven Solar Review (2026 Guide): https://www.thisoldhouse.com/solar-alternative-energy/blue-raven-solar-review
350. Palmetto Solar Reviews (2026 Guide): https://www.thisoldhouse.com/solar-alternative-energy/palmetto-solar-review
351. Semper Solaris Review (2026 Guide): https://www.thisoldhouse.com/solar-alternative-energy/semper-solaris-review
352. Sunrun Solar Review: Installation and Financing (2026): https://www.thisoldhouse.com/solar-alternative-energy/sunrun-review
353. Blue Raven Solar Reviews: https://www.trustpilot.com/review/blueravensolar.com
354. Momentum Solar Reviews | Read Customer Service Reviews of momentumsolar.com: https://www.trustpilot.com/review/momentumsolar.com
355. Semper Solaris Reviews | Read Customer Service Reviews of www.sempersolaris.com: https://www.trustpilot.com/review/www.sempersolaris.com
356. Momentum Solar Review 2024 | U.S. News: https://www.usnews.com/360-reviews/services/solar/momentum-solar
357. Sunrun partners with startup Lunar Energy to operate nationwide portfolio of virtual power plants: https://www.utilitydive.com/news/sunrun-lunar-energy-rooftop-solar-energy-storage-virtual-power-plants/641923/

Other Sources

358. Main Service: https://assets.solarbrain.com.au/uploads/attachment/file/1563/06c31d034492a0861df8cbc770a555ed.pdf
359. Sunrun and Tesla Solar Roof vs Solar Panels: 2026 EV Home Charging Guide: https://autoedgeview.com/ev-reviews/sunrun-tesla-solar-ev-charging-2026
360. SolarEdge Home Battery 48V Limited Product Warranty: https://cdn.shopify.com/s/files/1/0017/8847/7489/files/SolarEdge-Home-Battery-lv-Warranty.pdf?v=1777419458
361. Palmetto LightReach Lease Exhibit: https://evocloud-prod3-public.s3.us-east-2.amazonaws.com/meetings/21/attachments/21058.pdf
362. Organization - SEC.gov: https://www.sec.gov/Archives/edgar/data/1854401/000185440124000072/cslr-20240930.htm Explore more solar panel installation and energy systems guidance in the category directory.