The Hoymiles HMS-500-1T-NA rates 3.9 among one panel microinverters; the NEP BDM-600X rates 3.6 among two panel ones. The NEP BDM-600X costs $99 less ($100 vs $199).
A single panel inverter for big 500 W+ panels where shade or odd roof planes call for one inverter per panel. For a plain array, a Hoymiles four panel unit costs much less per watt.
Self2Solar $199The cheapest way per watt to run pairs of 300 W class panels, but confirm the warranty with the seller before buying.
Signature Solar $100Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
These two sit in different panel count classes (one panel and two panel), and each is scored against the reference points for its own class, so a rating says how well each does among its own panel count peers. How we rank explains each factor.
| Factor weight | Hoymiles HMS-500-1T-NA | NEP BDM-600X |
|---|---|---|
| Overall rating | 3.9/5 | 3.6/5 |
| Value 25% | 26 $0.42 per watt ($199, 475 W) | 90 $0.17 per watt ($100, 580 W) |
| Grid listing 20% | 100 UL 1741 listed, meets rapid shutdown | 100 UL 1741 listed, meets rapid shutdown |
| Efficiency 15% | 60 96.5% CEC weighted efficiency | 60 96.5% CEC weighted efficiency |
| Input current 15% | 50 14 A per input | 50 14 A per input |
| Warranty 25% | 100 25-year warranty | 0 warranty not published, scored as none |
| Hoymiles HMS-500-1T-NA | NEP BDM-600X | |
|---|---|---|
| Output | ||
| Panel inputs | 1 | 2 |
| AC output | 475 W | 580 W |
| Grid voltage | 240 V split phase or 208 V | 240 V split phase or 208 V |
| CEC efficiency | 96.5% | 96.5% |
| Peak efficiency | 96.5% | - |
| Panel input | ||
| Largest panel | 670 W | 450 W |
| Current per input | 14 A | 14 A |
| MPPT range | 16 to 60 V | 22 to 55 V |
| Listing and build | ||
| UL 1741 | Yes | Yes |
| Rapid shutdown | Yes | Yes |
| Monitoring | gateway (sold separately) | power line to a gateway |
| Enclosure | IP67 (NEMA 6) | IP67 (NEMA 6) |
| Weight | 3.9 lb | 6.4 lb |
| Warranty | 25 years | - |
