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Cold-weather optimized, snow-rated, built for NEM 2.0 credit maximization. Five panels ranked by real NH installer experience — not manufacturer marketing.
With the federal 25D tax credit at $0 and the NH state rebate repealed by SB 303, you are paying the full installed cost of your solar system. There is no 30% cushion to absorb the difference between a $2.85/W and a $3.30/W installation. Choosing the right panel for your budget and goals has never been more important.
The good news: New Hampshire charges 0% sales tax on solar equipment, saving you ~$1,500 compared to buying the same system in Massachusetts or Connecticut.
Cold weather is an advantage, not a liability. Here is what matters for panel selection in New Hampshire.
POSITIVE — Solar panels produce MORE power in cold weather. NH winters boost panel efficiency 5-15% vs. summer.
Panels are rated at 25°C (77°F). NH winter temps of -10°C to 5°C increase voltage output significantly. A panel with a -0.29%/°C coefficient gains ~10% efficiency at 0°C.
TEMPORARY — Snow slides off properly tilted panels within 1-2 days. Annual production loss: 2-5%.
Panels mounted at 25-35° pitch (standard NH roof angle) shed snow naturally. Dark panel surfaces absorb heat. Microinverters eliminate the string-level shutdown that occurs with string inverters when one panel is covered.
OFFSET BY — Long summer days (15+ hours) and high electricity rates make annual economics work.
NH gets ~1,175 peak sun hours/year. While lower than sunbelt states, NH electricity at $0.27/kWh is 65% above the national average — so each kWh produced is worth more.
CRITICAL — Panels must handle NH snow loads. Look for 5,400 Pa minimum.
5,400 Pa = approximately 113 lbs/sq ft. NH building code requires roofs to handle 40-60 lbs/sq ft snow load depending on location. All panels on our list exceed this requirement.
Ranked by cold-weather performance, snow-load rating, warranty, and value in a post-ITC market. These are the panels NuWatt installs across New Hampshire.
Lowest installed cost
Best value in a post-ITC market. At ~$2.85-$3.05/W installed, this panel delivers the fastest payback when every dollar counts.
Budget-conscious NH homeowners who want the fastest payback without the federal ITC.
Required for Propel lease
Made in North America (FEOC-compliant). Required for Section 48 Propel lease — the only way to access federal ITC savings in 2026.
NH homeowners using Propel lease to access Section 48 commercial ITC savings.
Highest efficiency & output
The best temp coefficient on this list (-0.26%/°C) means more power in NH cold. 7,000 Pa snow load is overkill for any NH winter.
Homeowners who want maximum output per panel and the strongest snow-load rating.
Strong Tier-1 option
Bankable Tier-1 manufacturer with excellent cold-weather specs. A solid mid-range choice for NH homeowners.
Homeowners who want a proven, bankable brand at a competitive price.
Widely available
German-engineered quality with strong cold-weather performance. Widely available from multiple NH installers for easy comparison shopping.
Homeowners who want a well-known European brand with wide installer availability.
| Spec | Hyundai HiE-S440VG | Silfab SIL-440-BG | REC Alpha | Canadian Solar | Q.CELLS Q.TRON |
|---|---|---|---|---|---|
| Wattage | 440W | 440W | 460W | 435W | 420W |
| Efficiency | 22.0% | 22.2% | 22.6% | 22.1% | 21.6% |
| Temp Coefficient | -0.30%/°C | -0.29%/°C | -0.26%/°C | -0.29%/°C | -0.29%/°C |
| Snow Load | 5,400 Pa | 5,400 Pa | 7,000 Pa | 5,400 Pa | 5,400 Pa |
| Warranty | 25-year product & performance | 30-year product & performance | 25-year product, 92% output at year 25 | 25-year product & performance | 25-year product & performance |
| Propel Eligible |
New Hampshire is one of five states with 0% sales tax. This applies to all solar equipment, inverters, racking, and installation labor. Here is what that saves you compared to neighboring states on a typical $24,000 system:
MA exempts solar equipment but NH saves on total
CT has partial exemption — NH is cleaner
VT exempts solar — but NH has no tax at all
ME exempts solar equipment
Note: Several NE states exempt solar from sales tax. NH's advantage is that there is no tax on anything — no exemption forms, no compliance, no risk of policy changes.
NH's NEM 2.0 credits you at ~85% of retail rate (100% supply + 100% transmission + 25% distribution). Higher-output panels maximize these credits.
A 460W panel produces ~5% more power than a 435W panel in the same roof space. Over 25 years with NEM 2.0 locked through 2041, that is thousands in additional credits.
Panels with lower temperature coefficients produce more power in NH cold. The REC Alpha (-0.26%/°C) gains ~11% efficiency at 0°C vs. rated output, while the Hyundai (-0.30%/°C) gains ~9%.
Your NEM credit rate is locked under NH PUC Docket DE 16-576. Higher-performing panels produce more credits at this guaranteed rate for 15+ years.
NH credits exported solar at approximately 85% of the retail rate — not the full retail rate. This means you save more money by self-consuming solar power (avoiding the full $0.27/kWh bill) than by exporting it (earning ~$0.23/kWh in credits). Panel sizing should target ~100% of your annual usage to maximize self-consumption. NuWatt designs systems for this optimal ratio.
Over 40% of NH electricity customers are now on Community Power Coalition (CPCNH) competitive supply rates. If your town is on CPCNH, the supply component of your NEM 2.0 credit may be slightly different than the default utility supply rate.
This does not change which panel you should choose — it slightly adjusts the value of exported credits. Higher-efficiency panels still maximize self-consumption (which is always at full retail rate) regardless of your supply source.
Full CPCNH & Solar GuideLowest $/W with strong cold-weather specs. Best for cash buyers who want the fastest return.
FEOC-compliant. Required for Propel lease to access Section 48 commercial ITC in 2026.
Best efficiency, lowest temp coefficient, highest snow-load. For homeowners who want the best panel available.
EXPIRED Dec 31, 2025
$0 for homeowner cash/loan purchases. Gone.
REPEALED by SB 303 (2024)
Previously $0.20/W up to $1,000. Permanently eliminated.
EXPIRED Dec 31, 2025
$0 for heat pumps, insulation, energy improvements.
No expired tax credits in our estimates. No repealed rebates. Choose your panel tier — Hyundai, Silfab, or REC — and get a real price for your NH home.