Growatt INFINITY 1500 vs OUPES 1800
Mid-range value challengers
Our Verdict
OUPES 1800 wins overall
Score 64 vs 59 —
better value at $0.54/Wh
| Spec | INFINITY 1500 | 1800 |
|---|---|---|
| SunSee Score | 59 | 64★ |
| Capacity | 1,512 Wh★ | 1,488 Wh |
| AC Output | 2,000W★ | 1,800W |
| Surge Output | 4,000W★ | 3,600W |
| Solar Input | 800W★ | 500W |
| Weight | 17.5 kg | 17 kg★ |
| Cycle Life | 3,000 | 3,500★ |
| Charge Time | 1.2h★ | 1.5h |
| $/Wh | $0.59 | $0.54★ |
| Battery Type | LiFePO4 | LiFePO4 |
Choose Growatt INFINITY 1500 if:
- +2000W from PV inverter leader
- +Fast solar charging
- +UPS function (seamless switchover)
Choose OUPES 1800 if:
- +1800W at great price
- +LiFePO4
- +UPS function
Not sure which size you need?
Our calculator tells you the exact capacity based on your appliances.
Size My SystemAffiliate Disclosure: Links may earn a commission at no extra cost to you. Learn more. Specs from official product pages as of July 2026.