APsystems DS3-S
#5 in Two panelFull review
A two panel unit for smaller 300 to 350 W panels. Most buyers should get the DS3-L, which costs less.
APsystems $205 US Solar Supplier $195$195
The APsystems DS3-S is the better microinverter overall, rated 4.2 to 3.6. The APsystems DS3-S leads on input current. The NEP BDM-600X wins on value. The NEP BDM-600X costs $95 less ($100 vs $195).
NEP BDM-600X
#7 in Two panelFull review
The cheapest way per watt to run pairs of 300 W class panels, but confirm the warranty with the seller before buying.
Signature Solar $100$100
Prices 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.
Which should you buy?
- Choose the APsystems DS3-S for input current (16 A per input vs 14 A per input).
- Choose the NEP BDM-600X for value ($0.17 per watt ($100, 580 W) vs $0.30 per watt ($195, 640 W)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every two panel microinverter; a clear win is highlighted. How we rank explains each one.
| Factor weight | APsystems DS3-S | NEP BDM-600X |
|---|---|---|
| Overall rating | 4.2/5 | 3.6/5 |
| Value 25% | 49 $0.30 per watt ($195, 640 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% | 75 16 A per input | 50 14 A per input |
| Warranty 25% | 100 25-year warranty | 0 warranty not published, scored as none |
Specifications
| APsystems DS3-S | NEP BDM-600X | |
|---|---|---|
| Output | ||
| Panel inputs | 2 | 2 |
| AC output | 640 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 | 97.3% | - |
| Panel input | ||
| Largest panel | 480 W | 450 W |
| Current per input | 16 A | 14 A |
| MPPT range | 28 to 45 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 | NEMA 6 | IP67 (NEMA 6) |
| Weight | 5.7 lb | 6.4 lb |
| Warranty | 25 years | - |
| Released | 2021-09 | - |