How long will a Generic 10 kWh home battery keep your power on?
With no sun, one Generic 10 kWh home battery runs a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave for about 33 h. With 7 kW of solar panels to recharge it, it gets many homes through a three-day outage.
A typical 10 kWh wall battery: a useful yardstick when comparing quotes for less common brands.
Runtime for one appliance at a time
| Appliance | kWh/day | Runtime | Power OK? |
|---|---|---|---|
| Refrigerator | 1.4 | 7.0 days | ✓ |
| Chest freezer | 0.8 | 11.9 days | ✓ |
| Modem + Wi-Fi router | 0.5 | 19.8 days | ✓ |
| LED lights (6 rooms) | 0.3 | 31.6 days | ✓ |
| Phones & laptop charging | 0.2 | 52.7 days | ✓ |
| Gas furnace blower (winter) | 3.0 | 3.2 days | ✓ |
| TV + streaming box | 0.5 | 19.8 days | ✓ |
| Box / ceiling fans (2) | 0.8 | 11.9 days | ✓ |
| Window AC (one room) | 7.2 | 32 h | ✓ |
| Central AC (3-ton) | 28.0 | 8 h | check surge |
| Heat pump heating (winter) | 30.0 | 8 h | ✓ |
| Space heater | 6.0 | 38 h | ✓ |
| Well pump (1 hp) | 1.0 | 9.5 days | ✓ |
| Sump pump (⅓ hp, storm) | 1.6 | 5.9 days | ✓ |
| Electric water heater | 9.0 | 25 h | ✓ |
| CPAP (no humidifier) | 0.3 | 29.6 days | ✓ |
| Oxygen concentrator | 8.4 | 27 h | ✓ |
| Microwave | 0.3 | 28.7 days | ✓ |
| Coffee maker | 0.2 | 52.7 days | ✓ |
| Electric cooktop (1 burner) | 1.1 | 8.4 days | ✓ |
| Washing machine (1 load) | 0.5 | 19.0 days | ✓ |
| EV charging (Level 1, 120 V) | 5.6 | 41 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 | 4.1 days | 8.2 days |
| Essentials + furnace fan + TV | 6.9 | 33 h | 66 h |
| Rural: essentials + well + sump | 6.0 | 38 h | 3.1 days |
| Summer outage with window AC | 10.8 | 21 h | 42 h |
| Medical: CPAP + essentials | 2.6 | 3.6 days | 7.2 days |
| Most of the house incl. central AC | 33.5 | ✗ power | 14 h |
“✗ power” means everything switched on at once would draw more than the battery can deliver.
With solar: a three-day outage in 19 cities
One Generic 10 kWh home battery plus 7 kW of south-facing panels, running the essentials above (6.9 kWh/day). The outage starts at 6 pm.
| City | Overcast January | Typical July |
|---|---|---|
| Seattle, WA | 53 h | all 3 days ✓ |
| Portland, OR | 55 h | all 3 days ✓ |
| San Francisco, CA | all 3 days ✓ | all 3 days ✓ |
| Los Angeles, CA | all 3 days ✓ | all 3 days ✓ |
| Phoenix, AZ | all 3 days ✓ | all 3 days ✓ |
| Las Vegas, NV | all 3 days ✓ | all 3 days ✓ |
| Denver, CO | all 3 days ✓ | all 3 days ✓ |
| Salt Lake City, UT | all 3 days ✓ | all 3 days ✓ |
| Dallas, TX | all 3 days ✓ | all 3 days ✓ |
| Houston, TX | all 3 days ✓ | all 3 days ✓ |
| Minneapolis, MN | all 3 days ✓ | all 3 days ✓ |
| Chicago, IL | all 3 days ✓ | all 3 days ✓ |
| Detroit, MI | 61 h | all 3 days ✓ |
| Atlanta, GA | all 3 days ✓ | all 3 days ✓ |
| Miami, FL | all 3 days ✓ | all 3 days ✓ |
| Charlotte, NC | all 3 days ✓ | all 3 days ✓ |
| Washington, DC | all 3 days ✓ | all 3 days ✓ |
| New York, NY | all 3 days ✓ | all 3 days ✓ |
| Boston, MA | all 3 days ✓ | all 3 days ✓ |
Questions about the Generic 10 kWh home battery
How long will a Generic 10 kWh home battery run a refrigerator?
About 7.0 days on its own, with no solar recharge, for a typical fridge using 1.4 kWh a day.
Can a Generic 10 kWh home battery run central air conditioning?
It can supply the roughly 3.5 kW a 3-ton unit draws, but at about 28 kWh on a hot day it would empty quickly. Check its motor-start (surge) rating with your installer.
How many Generic 10 kWh home battery units do I need for whole-home backup?
Roughly 3 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 is usually enough.
Can solar panels recharge a Generic 10 kWh home battery during a power outage?
Depends on the inverter: ask the installer.
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 |
| 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 |
| EcoFlow DELTA 2 (1 kWh class) | 1.02 | 1.8 | 3 h |
Specifications are manufacturer figures as of September 2026. We are not paid by any manufacturer. Verify the current datasheet before you buy.