Hoymiles HiFlow Pro LV HMS-420-1WM-LV
Inverter only (panels sold separately) · Checked November 10, 2026
Specs
- AC output
- 420 W
- Panels
- Not included
- Inverter
- Hoymiles HMS-420-1WM-LV (1 MPPT; 420 VA rated output, 120 V)
- Battery
- Not included
- Plug
- Not stated
- Price
- Unknown
Same family as HMS-391. The datasheet also lists 360, 450 and 500 VA models.
Certification
| Standard | Status | Evidence |
|---|---|---|
| UL 3700 | 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 |
| UL 1741 | Claimed by maker, not verified Listed under compliance on the North America datasheet (REV1.1). | Evidence Checked November 10, 2026 |
Which state limits it fits
| State | Result |
|---|---|
| California | UL 3700 claimed, no certificate seen maker’s claim |
| Colorado | Listing claimed, no certificate seen maker’s claim |
| Connecticut | Listing claimed, no certificate seen maker’s claim |
| Maine | UL 3700 claimed, no certificate seen maker’s claim |
| Maryland | Listing claimed, no certificate seen maker’s claim |
| New Hampshire | State rules not yet verified |
| New Jersey | UL 3700 claimed, no certificate seen maker’s claim |
| Utah | Listing claimed, no certificate seen maker’s claim |
| Vermont | UL 3700 claimed, no certificate seen maker’s claim |
| Virginia | Listing claimed, no certificate seen maker’s claim |
Only states with an enacted law are listed.
What these labels mean
- Listing claimed, no certificate seen
- The maker says the product is lab-listed (for example to UL 1741), but we have not seen a certificate.
- UL 3700 claimed, no certificate seen
- The maker says the product meets UL 3700, but we have not seen a certificate.
- State rules not yet verified
- We have not yet confirmed this state’s rules on an official source.
Sources
- Hoymiles HiFlow (360-500) Pro LV North America datasheet REV1.1 (Manufacturer page; accessed November 10, 2026)
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.