Hoymiles Power Electronics makes microinverters, single- and three-phase hybrid inverters and module-level rapid shutdown hardware; its North American single-phase hybrid line is sold as the HYS-LV-USG1 series.
Product / system scope unresolved. Hoymiles’ North America HiFlow (360-500) Pro LV datasheet, REV1.1, page 2 prints HMS-360-1WM-LV in its model columns and “UL 1741, UL 3700, IEEE 1547” in the shared Compliance row. Page 1 names the HiFlow Pro LV series; the matching North America manual cover also prints the exact five codes. Those retained originals were re-hashed and the datasheet’s two pages and manual cover were visually read. The current US HiFlow Pro product page says “certified to UL 3700”; the July 15, 2026 announcement says “UL 3700-compliant”. Both current maker pages were read November 6, 2026 Pacific (November 7 UTC). The page’s certification wording and the announcement’s compliance wording are kept separately as manufacturer claims. No issuer, file number, edition, certification configuration or complete-kit scope was established; no current issuer record was read. This row reaches only the printed North America LV code, not European HiFlow variants or any assembled kit.
Product / system scope unresolved. Hoymiles’ North America HiFlow (360-500) Pro LV datasheet, REV1.1, page 2 prints HMS-391-1WM-LV in its model columns and “UL 1741, UL 3700, IEEE 1547” in the shared Compliance row. Page 1 names the HiFlow Pro LV series; the matching North America manual cover also prints the exact five codes. Those retained originals were re-hashed and the datasheet’s two pages and manual cover were visually read. The current US HiFlow Pro product page says “certified to UL 3700”; the July 15, 2026 announcement says “UL 3700-compliant”. Both current maker pages were read November 6, 2026 Pacific (November 7 UTC). The page’s certification wording and the announcement’s compliance wording are kept separately as manufacturer claims. No issuer, file number, edition, certification configuration or complete-kit scope was established; no current issuer record was read. This row reaches only the printed North America LV code, not European HiFlow variants or any assembled kit.
Product / system scope unresolved. Hoymiles’ North America HiFlow (360-500) Pro LV datasheet, REV1.1, page 2 prints HMS-420-1WM-LV in its model columns and “UL 1741, UL 3700, IEEE 1547” in the shared Compliance row. Page 1 names the HiFlow Pro LV series; the matching North America manual cover also prints the exact five codes. Those retained originals were re-hashed and the datasheet’s two pages and manual cover were visually read. The current US HiFlow Pro product page says “certified to UL 3700”; the July 15, 2026 announcement says “UL 3700-compliant”. Both current maker pages were read November 6, 2026 Pacific (November 7 UTC). The page’s certification wording and the announcement’s compliance wording are kept separately as manufacturer claims. No issuer, file number, edition, certification configuration or complete-kit scope was established; no current issuer record was read. This row reaches only the printed North America LV code, not European HiFlow variants or any assembled kit.
Product / system scope unresolved. Hoymiles’ North America HiFlow (360-500) Pro LV datasheet, REV1.1, page 2 prints HMS-450-1WM-LV in its model columns and “UL 1741, UL 3700, IEEE 1547” in the shared Compliance row. Page 1 names the HiFlow Pro LV series; the matching North America manual cover also prints the exact five codes. Those retained originals were re-hashed and the datasheet’s two pages and manual cover were visually read. The current US HiFlow Pro product page says “certified to UL 3700”; the July 15, 2026 announcement says “UL 3700-compliant”. Both current maker pages were read November 6, 2026 Pacific (November 7 UTC). The page’s certification wording and the announcement’s compliance wording are kept separately as manufacturer claims. No issuer, file number, edition, certification configuration or complete-kit scope was established; no current issuer record was read. This row reaches only the printed North America LV code, not European HiFlow variants or any assembled kit.
Product / system scope unresolved. Hoymiles’ North America HiFlow (360-500) Pro LV datasheet, REV1.1, page 2 prints HMS-500-1WM-LV in its model columns and “UL 1741, UL 3700, IEEE 1547” in the shared Compliance row. Page 1 names the HiFlow Pro LV series; the matching North America manual cover also prints the exact five codes. Those retained originals were re-hashed and the datasheet’s two pages and manual cover were visually read. The current US HiFlow Pro product page says “certified to UL 3700”; the July 15, 2026 announcement says “UL 3700-compliant”. Both current maker pages were read November 6, 2026 Pacific (November 7 UTC). The page’s certification wording and the announcement’s compliance wording are kept separately as manufacturer claims. No issuer, file number, edition, certification configuration or complete-kit scope was established; no current issuer record was read. This row reaches only the printed North America LV code, not European HiFlow variants or any assembled kit.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HYS-11.5LV-USG1 {240V}": UL 1741 SB, certifying entity CSA Group, certificate date 2023-10-30, CEC listing date 2024-02-01. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model HYS-11.5LV-USG1 listed on the California Energy Commission Grid Support Battery Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HYS-11.5LV-USG1 {240V}", CEC listing date 2024-02-01. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Model HYS-11.5LV-USG1 listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HYS-11.5LV-USG1 {240V}", CEC listing date 2024-02-01. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-400NT {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2020-06-12, CEC listing date 2020-08-03. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-400NT {240V}": UL 1741 SB, certifying entity CSA Group, certificate date 2023-02-27, CEC listing date 2020-08-03. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model HM-400NT listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HM-400NT {208V}"; "HM-400NT {240V}", CEC listing date 2020-08-03. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-800NT {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2020-04-03, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-800NT {208V}": UL 1741 SB, certifying entity CSA Group, certificate date 2023-03-15, CEC listing date 2023-04-21. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model HM-800NT listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HM-800NT {208V}"; "HM-800NT {240V}", CEC listing date 2023-04-21. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-1200NT {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2020-03-12, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-1200NT {240V}": UL 1741 SB, certifying entity CSA, certificate date 2023-06-06, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model HM-1200NT listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HM-1200NT {240V}", CEC listing date 2020-05-11. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-1500N {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2020-03-12, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-1500N {240V}": UL 1741 SB, certifying entity CSA, certificate date 2023-06-06, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model HM-1500N listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HM-1500N {208V}"; "HM-1500N {240V}", CEC listing date 2020-05-11. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Model HM-350NT listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HM-350NT {240V}", CEC listing date 2020-08-03. This is an equipment listing, not UL certification or complete-system approval.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-700NT {240V}": UL 1741 SA, certifying entity CSA Group, certificate date 2020-04-03, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) as Hoymiles Power Electronics Inc. "HM-700NT {240V}": UL 1741 SB, certifying entity CSA Group, certificate date 2023-03-15, CEC listing date 2020-05-11. A state equipment list entry, not the certification body's own record.
Product / system scope unresolved. Model HM-700NT listed on the California Energy Commission Grid Support Solar Inverter List (data unchanged since October 1, 2026; downloaded October 11, 2026) under Hoymiles Power Electronics Inc., as "HM-700NT {240V}", CEC listing date 2020-05-11. This is an equipment listing, not UL certification or complete-system approval.
This manufacturer is listed as Hoymiles. Manufacturing entities, factories, cell origin and model-specific ownership relationships have not been audited.
Product certificates and company management certificates are tracked separately. No company management certificates have been reviewed for this manufacturer yet.
Summary:
Works as expected
Gets hot
Can add a fan for cheap
Build an OpenDTU for monitoring
I have had a SolarEdge system for 5 years but wanted to bootleg a bit more power into my PTO system without getting kicked onto NEM 3.0.
Anyways, I found this in 2025 and purchased it on a whim for about $350 from NAZ Solar. I connected some old 250w panels to test it out and it got all it could out of those for about 6 months, as much as other MPPT's have. I then purchased four N Type 390w panels and this inverter is going strong. I've gotten 1300+w out of it with the panels are laying almost level on a patio roof. I installed them in August, after solar peak so I'm hoping to see it get to almost the panels rated capacity, to be honest.
It does get pretty hot. I'm only using about 3/4 of its rated capacity and it's pushing 140°F on a 100°F day. I ended up printing a rack to mount a pair of fans on it and it dropped the temp by about 40°. It was working fine but I figure it is better to be cooler. The fan cost about $50 to build with the solar panel and buck converter. It just runs when the panel is producing power. I figure that is a pretty decent proxy for inverter heat.
The only ding I have about the company is that if you want to do any monitoring, they want you to use their $300 DTU. I tried to source the DTU Lite and it didn't work out. Hoymiles will only let you open an account if your seller creates one for you. NAZ solar wouldn't do it for the DTU Lite because I didn't buy it though them.
Anyways, I built an OpenDTU for about $50 in parts and now I have a dashboard running in Home Assistant, so it worked out fine. The way I see it, this is a real bargain. I don't know if I'd push it to 2000w and expect it to last forever, but I don't have any real reason to think it won't. It has worked perfect for me for a year. I'm looking forward to seeing how close to the panel's max it get in July.
This is about what I have into it:
$350 Inverter
$50 cable and tool
$50 fans and panel (3D printed fan mount)
$50 Open DTU
$5 ABS filament for custom design stand, fan mounts and covers
