Certification watch
UL 3700 is the North American safety standard written for plug-in solar systems. Some state laws require it, or certification of the whole system, before a kit qualifies. This page tracks which products have that certificate, based on certificates we have seen, not marketing.
States where this matters most
These states' laws name UL 3700 (or a comparable standard) or require certification as a complete plug-in system:
- California: no confirmed kit yet
- Maine: no confirmed kit yet
- New Jersey: no confirmed kit yet
- Vermont: no confirmed kit yet
States that ask for lab certification only
These laws require certification by UL or an equivalent lab without naming UL 3700. Where we have seen a lab certificate for a kit's inverter, we show it as likely compatible: confirm with seller. Where the maker only claims a listing, we say so.
- Colorado: no complete kit confirmed, 1 likely compatible (confirm with seller)
- Connecticut: no complete kit confirmed, 1 likely compatible (confirm with seller)
- Maryland: no complete kit confirmed, 1 likely compatible (confirm with seller)
- Utah: no complete kit confirmed, 1 likely compatible (confirm with seller)
- Virginia: no complete kit confirmed, 1 likely compatible (confirm with seller)
Status by product
| Product | UL 3700 status | Certifier and conditions | Evidence |
|---|---|---|---|
| APsystems EZ1-LV plug-in microinverter | Certified (certificate seen) component only | CSA Group CSA Certificate of Compliance 80310017 (issued 2026-07-15) certifies the EZ1-LV as a PIPV grid-interactive inverter "interconnected with other subassembly plug-in equipment to form a PIPV System". Conditions: further evaluation is needed when forming a complete system; for use on dedicated circuits (10 A breaker); a listed proprietary latching or locking plug and receptacle (mated pair) per UL 6703; a listed Class A GFCI between the system and any non-dedicated circuit. | Evidence Checked November 10, 2026 |
| Hoymiles HiFlow Pro LV HMS-391-1WM-LV | Claimed by maker, not verified | Hoymiles calls HiFlow Pro "the first UL 3700-compliant plug-in microinverter" and its datasheet lists UL 3700. We found no certificate document or directory entry, and the certifier is not named. | Evidence Checked November 10, 2026 |
| Hoymiles HiFlow Pro LV HMS-420-1WM-LV | Claimed by maker, not verified | Hoymiles calls HiFlow Pro "the first UL 3700-compliant plug-in microinverter" and its datasheet lists UL 3700. We found no certificate document or directory entry, and the certifier is not named. | Evidence Checked November 10, 2026 |
| Bright Saver Balcony Solar Kit, 180 W | Not certified | The seller states it cannot ship to states that require whole-system UL 3700 certification (it names California, Maine and Vermont) "as UL 3700 balcony solar kits have not yet been achieved." | Evidence Checked November 10, 2026 |
| Bright Saver Balcony Solar Kit, 360 W | Not certified | Same seller statement as the 180 W kit: no UL 3700 balcony kits yet. | Evidence Checked November 10, 2026 |
| EcoFlow STREAM Microinverter | Unknown | No UL 3700 claim found on the manufacturer page and no directory entry found. UL Product iQ and the CSA directory were not reachable from our research environment. | None found Checked November 10, 2026 |
| EcoFlow STREAM Microinverter + 2 x 400W Rigid Solar Panels | Unknown | No UL 3700 claim found on the manufacturer page and no directory entry found. UL Product iQ and the CSA directory were not reachable from our research environment. | None found Checked November 10, 2026 |
| EcoFlow STREAM Ultra | Unknown | No UL 3700 claim found on the manufacturer page and no directory entry found. UL Product iQ and the CSA directory were not reachable from our research environment. | None found Checked November 10, 2026 |
| CraftStrom 800 Watt Plug&Play Solar | Unknown | No UL 3700 claim found on the manufacturer page and no directory entry found. UL Product iQ and the CSA directory were not reachable from our research environment. | None found Checked November 10, 2026 |
| CraftStrom 1200 Watt Plug&Play Solar | Unknown | No UL 3700 claim found on the manufacturer page and no directory entry found. UL Product iQ and the CSA directory were not reachable from our research environment. | None found Checked November 10, 2026 |
How we check
We mark a product "certified" only with an entry in the certifier's public directory or a certificate document. A product page that says "UL 3700 compliant" counts as a claim. We also record what the certificate covers: a single component, such as an inverter, or the complete system you plug in. On November 10, 2026, UL's Product iQ and CSA's directory could not be reached from our research tools, so the one certificate listed comes from a CSA certificate the manufacturer publishes. We re-check every week. Full method.
Tell me when a certified kit is legal in my state
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This page is general information, not legal or electrical advice. Laws change and utilities differ. Check the linked official sources, your lease or HOA rules, and your utility before you buy or install anything. Full disclaimer.