How long will a EcoFlow DELTA 2 (1 kWh class) keep your power on?
With no sun, one EcoFlow DELTA 2 (1 kWh class) runs a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave for about 3 h. Add a portable solar panel and it lasts longer on sunny days.
EcoFlow DELTA 2 is a 1 kWh-class portable station, enough for a fridge, lights and phones for part of a day.
Runtime for one appliance at a time
| Appliance | kWh/day | Runtime | Power OK? |
|---|---|---|---|
| Refrigerator | 1.4 | 15 h | ✓ |
| Chest freezer | 0.8 | 26 h | ✓ |
| Modem + Wi-Fi router | 0.5 | 43 h | ✓ |
| LED lights (6 rooms) | 0.3 | 69 h | ✓ |
| Phones & laptop charging | 0.2 | 4.8 days | ✓ |
| Gas furnace blower (winter) | 3.0 | 7 h | ✓ |
| TV + streaming box | 0.5 | 43 h | ✓ |
| Box / ceiling fans (2) | 0.8 | 26 h | ✓ |
| Window AC (one room) | 7.2 | 3 h | ✓ |
| Central AC (3-ton) | 28.0 | 45 min | ✗ too big |
| Heat pump heating (winter) | 30.0 | 42 min | ✗ too big |
| Space heater | 6.0 | 3 h | ✓ |
| Well pump (1 hp) | 1.0 | 21 h | check surge |
| Sump pump (⅓ hp, storm) | 1.6 | 13 h | ✓ |
| Electric water heater | 9.0 | 2 h | ✗ too big |
| CPAP (no humidifier) | 0.3 | 65 h | ✓ |
| Oxygen concentrator | 8.4 | 2 h | ✓ |
| Microwave | 0.3 | 63 h | ✓ |
| Coffee maker | 0.2 | 4.8 days | ✓ |
| Electric cooktop (1 burner) | 1.1 | 18 h | ✓ |
| Washing machine (1 load) | 0.5 | 42 h | ✓ |
| EV charging (Level 1, 120 V) | 5.6 | 4 h | ✓ |
Typical running watts × hours a day; starting full, no recharge. “Check surge” means the motor’s start-up draw may exceed the battery’s surge rating.
Runtime for common outage plans
| What stays on | kWh/day | 1 unit | 2 units |
|---|---|---|---|
| Keep the food cold & lights on | 2.3 | 9 h | 18 h |
| Essentials + furnace fan + TV | 6.9 | ✗ power | 6 h |
| Rural: essentials + well + sump | 6.0 | ✗ power | 7 h |
| Summer outage with window AC | 10.8 | 2 h | 4 h |
| Medical: CPAP + essentials | 2.6 | 8 h | 16 h |
| Most of the house incl. central AC | 33.5 | ✗ power | ✗ power |
“✗ power” means everything switched on at once would draw more than the battery can deliver.
Questions about the EcoFlow DELTA 2 (1 kWh class)
How long will a EcoFlow DELTA 2 (1 kWh class) run a refrigerator?
About 15 h on its own, with no solar recharge, for a typical fridge using 1.4 kWh a day.
Can a EcoFlow DELTA 2 (1 kWh class) run central air conditioning?
Not reliably: a 3-ton central AC draws about 3.5 kW, more than its 1.8 kW output, and far more at start-up.
How many EcoFlow DELTA 2 (1 kWh class) units do I need for whole-home backup?
Roughly 30 for a house with central AC and electric cooking, sized both for energy (a day of use) and for power (everything running at once). For essentials only, one or two are usually enough.
Can solar panels recharge a EcoFlow DELTA 2 (1 kWh class) during a power outage?
Yes, from portable solar panels.
Compare with other batteries
| Battery | Usable kWh | kW | Essentials runtime |
|---|---|---|---|
| Tesla Powerwall 3 | 13.5 | 11.5 | 44 h |
| FranklinWH aPower 2 | 15 | 10 | 49 h |
| Enphase IQ Battery 5P | 5 | 3.84 | 16 h |
| SolarEdge Home Battery | 9.7 | 5 | 32 h |
| Generic 10 kWh home battery | 10 | 5 | 33 h |
| EcoFlow DELTA Pro Ultra (1 battery) | 6.1 | 7.2 | 18 h |
| Anker SOLIX F3800 | 3.84 | 6 | 11 h |
| Jackery Explorer 2000 Plus | 2.04 | 3 | 6 h |
Specifications are manufacturer figures as of September 2026. We are not paid by any manufacturer. Verify the current datasheet before you buy.