Granite State Solar Review
Solar, battery and generator installerBased in Bow, New HampshireProfile updated October 13, 2026
Is Granite State Solar a good choice?
Granite State Solar fits New Hampshire homeowners who want a local installer that names its equipment and handles batteries and generators too. It says it was founded in 2008 and has an in-house service team. Its FAQ states a 12-year workmanship warranty that it says backs its roof penetrations. Financing is listed through one credit union only, so ask about other ways to pay.
- Price
- Quote required; no system price on the company pages we reviewed. Costs
- Coverage
- NH statewide, per the company. Service area
- Warranty
- Workmanship 12 years, covering roof penetrations; panel makers’ 25-year product and 30-year output terms. Warranty
On this page
Why choose Granite State Solar, and why you might not
What Granite State Solar does well, and where to be careful, compared with the installers it competes with most.
Reasons to choose Granite State Solar
Its warranty covers roof leaksGranite State covers its own work for 12 years. Its FAQ says that includes leaks where the panels are bolted to the roof. ReVision and Boston Solar also say they cover those leaks.
It names its equipmentIt names JA Solar and Hyundai panels and Enphase microinverters, the small boxes that turn solar power into home power. Catamount and ReVision name no panel brand. You can look them up before a sales visit.
It does batteries and generators tooGranite State also puts in batteries and generators. It names Enphase, Franklin and Tesla Powerwall batteries. It says it has its own service team.
Owners praise clear talk and clean crewsIts head-office Google listing shows 4.8 from 235 reviews. Its good reviews praise clear answers upfront, clean installers and help with the power company.
Reasons to look at others
It lists only one way to payGranite State lists one way to pay: a loan from EastRise Credit Union. It does not say if you can pay upfront, rent the panels or take a PPA (you pay for the power; the company owns the panels). Ask.
Some warranty repairs took monthsIts negative reviews describe warranty repairs that waited months, and emails with no answer. Ask how fast it books a warranty visit.
Some owners report surprise chargesNegative reviews describe an extra drilling charge and $2,000 more for financing. Get every charge in writing before you sign.
It shows no license numberGranite State does not print its New Hampshire license number. Its license was active when we checked on October 13, 2026. Ask for the number and keep it with your contract.
Granite State Solar reviews: what customers say
Each review site shows its own score; we read them on October 12 and 13, 2026 and do not combine them or add our own rating.
- Google4.8 / 5235 reviews · Bow, NH office listing only, not company-wideRead reviews
The five positive reviews below praise upfront communication, clean installers, help with the utility, and defective panels replaced quickly. The five negative reviews describe tracker warranty repairs that waited months, an extra drilling charge the reviewer calls misrepresented, a monitoring system the utility refused because of wiring, a failed inspection plus $2,000 more for financing, and emails that went unanswered. These are issues to ask about, not a measure of how often they happen. Ask Granite State how quickly warranty visits are scheduled, and get every charge in writing.
5 recent 5-star reviews
“Great communicative team who were very upfront about current technologies, project details and steps in the process to install a whole home battery backup system.”
Mark F. · Read on Google
“The installation was great and installers nice and professional clean up afterwards would have them back in a instant”
michael c. · Read on Google
“The installation team and the electricians were fabulous, in that they were friendly, efficient, good workmanship, and were willing to answer many of the questions I had and left the work-site spotless.”
John H. · Read on Google
“Thank you, Granite State Solar!”
Douglas M. · Read on Google
“The entire team is amazing and professional and accommodating.”
Donald B. · Read on Google
5 recent 1- and 2-star reviews
“Again I still have not received an estimate on when they will be able to come out to address the warranty issue.”
Carly M. · Read on Google
“I am more disappointed with the way the install went and how it was misrepresented in the beginning..”
Rcher · Read on Google
“But worse, they initially miswired the monitoring system such that Eversource refused to connect to it.”
Jason B. · Read on Google
“I had paid in full and still had to beg to be granted access to something I owned 100% out-right.”
Justin R. · Read on Google
“I even showed him my electric bill and he never responded.”
Dave M. · Read on Google
How we picked these: the five newest 5-star and the five newest 1- or 2-star reviews with written text on Google and Trustpilot, as of October 2026 (200 reviews read, back to Apr 10, 2019). We found no Trustpilot page for Granite State Solar on October 12, 2026. Each quote is one sentence, word for word. Picking the highest and lowest ratings shows the range of experiences; it is not a representative sample, and we did not verify what reviewers describe.
How much does Granite State Solar cost?
Granite State Solar does not publish a price for your system on the pages we reviewed. Ask for an itemized quote with the cash price, system size, panel and inverter models and, for a loan, the credit union’s full terms. Its financing page says the EastRise loan can fund the full project cost. For state price ranges, see our solar panel cost guide; for how the plans compare, see loans, leases and PPAs.
Credit union loan
You own itThrough EastRise Credit Union. The company says there are no prepayment penalties and you join NESEA at no cost to qualify for membership.
Plans as listed on Granite State Solar’s financing page, read October 13, 2026. No cash, lease or PPA terms are listed.
Granite State Solar’s residential solar page lists JA Solar and Hyundai panels and Enphase microinverters. Its battery page lists the Enphase IQ Battery 10C, Franklin Home Power and Tesla Powerwall 3, and says it is a Tesla Powerwall Certified Installer and Enphase Platinum Installer. Your written proposal should list the exact models, the system size in kilowatts (kW) and the forecast yearly production in kilowatt-hours (kWh). It installs roof and ground mounts.
What does Granite State Solar’s warranty cover?
Coverage | What Granite State Solar publishes | What to confirm |
|---|---|---|
Solar panels | 25 years (maker’s product warranty for the JA Solar and Hyundai panels it lists) | Which panel model you get and that the maker’s term applies to it. |
Panel output | 30 years (maker’s linear power warranty for the panels it lists) | The guaranteed output percentage at the end of the term. |
Inverter | 15 years (the company cites a 15-year limited warranty on Enphase products) | The exact inverter model and its maker’s current term. |
Battery | Franklin 12 years; Enphase 15 years, per its battery page | The battery model, its maker’s term and who services it. |
Labor and workmanship | 12 years | That the 12-year term is in your contract and what it excludes. |
Roof penetrations | Covered by the 12-year workmanship warranty, per its FAQ | That leaks at mounts are covered in writing, and how claims are handled. |
Company-published terms from Granite State Solar’s FAQ, residential solar page and battery page, read October 13, 2026. Your signed agreement decides what applies.
Where does Granite State Solar operate, and which licenses were checked?
Granite State Solar’s about page says it serves the entire state of New Hampshire from Bow (read October 13, 2026). Its service area page lists towns in Grafton, Hillsborough, Merrimack, Rockingham and Sullivan counties and says it may still serve towns not listed. A listed town does not mean every address qualifies or that EcoGen can connect you with Granite State Solar there.
Showing Bow, NH (headquarters)
Office address (1)
- Bow, NH (headquarters)57 Ryan Rd, Bow, NH 03304Show on mapOpen in Google Maps
Address from Granite State Solar’s website, read October 13, 2026.
Licenses
We found 1 active license record in state registries (October 13, 2026). Check the license yourself under the exact business name on your contract. A license check confirms registration, not workmanship quality.
New Hampshire1 recordActive, checked Oct 13, 2026
- License
- Electrical contractor or solar license
- Number
- Not published
- Registry check
- Not checked by us
- Note
- No license number appears on the pages we read (October 13, 2026). Ask for it before you sign.
- License
- Electrical Corporation
- Number
- 0366C
- Registry check
- Active, New Hampshire Office of Professional Licensure and Certification (Electricians Board), checked October 13, 2026
- Note
- Registry lists GRANITE STATE SOLAR LLC; expires 2027-05-31.
Granite State Solar’s battery page says it is a Tesla Powerwall Certified Installer and an Enphase Platinum Installer. Its about page names Green Mountain Solar and Vermont Generator Systems as sister companies. These are company statements; we did not verify them.
Granite State Solar compared with three other installers
All eight alternatives share Granite State’s one state, New Hampshire. We chose these three because, like Granite State, each is a New England installer that lists a warranty on its own work. Every fact comes from the company profiles linked below.
| Granite State SolarThis page | ReVision Energy | Catamount Solar | Boston Solar | |
|---|---|---|---|---|
| Best for | NH homes wanting named equipment and battery backup | An employee-owned installer with its own service team | A small local co-op for roof or off-grid | A long-running installer in MA and southern NH |
| Head office | Bow, NH | South Portland, ME | Randolph, VT | Woburn, MA |
| States shared with Granite State Solar | Its only state | 1: NH | 1: NH | 1: NH |
| Roofing | Not listed | Not listed | Not listed | Not listed |
| Ways to pay | Credit union loan | Buy, loan, rent, prepaid rent, community solar | Buy, credit union loan, prepaid rent | Buy, loan, rent, PPA |
| Labor warranty | 12 years | 10 years in NH | 15 years | 10 or 30 years (its pages differ) |
| Roof leak warranty | Covered by its 12-year warranty | Covered by its 10-year NH warranty | Not listed separately | Its FAQ says covered for 30 years |
| Brands named | JA Solar, Hyundai, Enphase, Tesla, Franklin | Tesla, FranklinWH, SolarEdge, Enphase, SMA | Enphase, Tesla, SolarEdge, Solis, FranklinWH | Qcells, REC, Enphase, FranklinWH, Tesla |
| Google score* | 4.8 (235 reviews) | 4.9 (357 reviews) | 4.9 (59 reviews) | 4.7 (1,360 reviews) |
*Each Google score is for the company’s head-office listing only, read October 12 and 13, 2026.
Full profiles: ReVision Energy · Catamount Solar · Boston Solar
Before choosing Granite State Solar
Ask for these in writing:
- An itemized quote with the cash price and the financed total, including the APR and all fees.
- The exact panel, inverter and battery models, the system size in kW and the forecast yearly production in kWh.
- The warranty documents for your payment plan: panels, inverter, labor and roof penetrations.
- Your local service contact, and who handles utility approval and warranty claims.
- The exact company on the contract, such as Granite State Solar, and its license for your state.
Before you sign, read the quote line by line and bring our questions to ask a solar installer.
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How we researched this profile
We read Granite State Solar’s own pages on October 13, 2026: homepage, who we are, service areas, residential solar, residential battery backup, financing, FAQ and contact. We did not buy a system, request a quote, visit an office or interview customers. Granite State Solar did not review this page.
Our installer methodology explains what we check.
Sources (8)
- Granite State Solar: Homepage, read October 13, 2026
- Granite State Solar: Who we are, read October 13, 2026
- Granite State Solar: Service areas, read October 13, 2026
- Granite State Solar: Residential solar (panel warranties), read October 13, 2026
- Granite State Solar: Residential battery backup, read October 13, 2026
- Granite State Solar: Financing, read October 13, 2026
- Granite State Solar: FAQ (workmanship warranty), read October 13, 2026
- Granite State Solar: Contact (address), read October 13, 2026