Balcony Solar in New Hampshire
New Hampshire's SB 540-FN allows one plug-in solar system per customer with a 1,200-watt AC inverter cap — one of the few laws to state the cap explicitly in AC. Its main provisions take effect January 1, 2027.
Reviewed August 6, 2026 against primary sources. Laws change — the sources below let you re-check.
Does New Hampshire require UL 3700?
No — the statute does not name UL 3700.
certified by a nationally recognized testing laboratory to meet nationally recognized safety standards applicable to distributed energy resources and plug-in solar generation systems.
Does not name UL 3700, and the operative section does not reference the NEC — UL, ANSI, and IEEE appear only as a rulemaking ceiling.
Why this matters: “certified by UL” names an organization; “certified to UL 3700” names a plug-in-PV standard. They are not the same claim. Full explainer →
What the law does
- No utility approval, interconnection review, agreement, or fees; notification is for information only.
- Utility is not liable (RSA 374:1-b).
What's still unsettled
- Anti-islanding is not explicit; it relies on the definition's requirement to meet national DER interconnection standards.
- A building-code section is further contingent on the NH Department of Energy certifying that a national standard for safe connection exists.
Before you buy in New Hampshire
A state law opening the door is only one of three gates. The gear must actually be certified to what the law asks for — and today no plug-in kit sold in the US carries UL 3700 yet. Your utility may still want notification. If you rent, your lease or HOA is a separate yes. What "UL 3700 certified" really means →