Can a Solar Generator Run a Sump Pump?
Short answer: Yes — but surge wattage is the critical spec. A standard ⅓ HP sump pump needs 800-1,300W surge to start. The EcoFlow Delta Pro (7,200W surge) handles it easily. The EcoFlow Delta 2 Max (2,400W surge) is marginal for larger pumps. The biggest risk is during a power outage storm when the pump cycles frequently — battery depletion is the real concern, not startup.
Sump Pump Power Requirements
| Pump size | Running watts | Startup surge | Cycles per hour | Wh per hour |
|---|---|---|---|---|
| ⅓ HP | 300-400W | 800-1,300W | 6-10 | 100-150 Wh |
| ½ HP | 400-500W | 1,200-2,000W | 6-10 | 150-200 Wh |
| ¾ HP | 600-700W | 1,800-2,800W | 4-8 | 180-240 Wh |
| 1 HP | 750-900W | 2,200-3,500W | 4-8 | 220-280 Wh |
The Real Risk: Battery Depletion During a Storm
During heavy rain, a sump pump can cycle 8-10 times per hour. At 150 Wh per hour for a ⅓ HP pump, a 1,024 Wh battery (EcoFlow Delta 2) lasts approximately 6-7 hours of active pumping. A 3,600 Wh Delta Pro lasts 20-24 hours. For a multi-day storm outage, even the Delta Pro may need recharging.
Recommended Generators for Sump Pumps
| Generator | Surge | ⅓ HP pump | ½ HP pump | Price |
|---|---|---|---|---|
| EcoFlow Delta Pro | 7,200W | ✓ Easy | ✓ Easy | $1,799 |
| Bluetti AC200P | 4,800W | ✓ Easy | ✓ Yes | $1,299 |
| EcoFlow Delta 2 Max | 2,400W | ✓ Yes | ⚠️ Marginal | $899 |
| EcoFlow Delta 2 | 2,700W | ✓ Yes | ⚠️ Marginal | $699 |
Honest Recommendation
For a standard ⅓ HP sump pump during a 12-hour outage, the EcoFlow Delta 2 ($699) is the minimum practical option — it handles the surge and provides enough capacity for moderate pumping cycles. For ½ HP pumps or extended outages, the EcoFlow Delta Pro ($1,799) is the safe choice.
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