EcoFlow
DELTA 3
- Nominal capacity
- 1,024 Wh Manufacturer source for Nominal capacity (checked 2026-10-04; opens in a new tab)
When to consider another option Loads requiring 240 V or more than the continuous output rating.
Read the fit and limitationsCalculators Backup power planning
What solar and battery capacity supports essential loads?
Size essential loads first, then estimate battery, solar, and inverter needs.
About 4 minutes You’ll need: essential loads, use hours, and sun assumptions
Solar power calculator for household backup energy planning
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Illustrative sizing math
Daily essential watt-hours to array and storage planning figures
These illustrative rows show how daily essential energy use relates to array watts (using an example 4 peak-sun-hour window and 75% system efficiency) and a 1-day storage target (using an example 20% reserve and 85% conversion efficiency). Actual production depends on season, weather, tilt, shade, and charge-controller voltage/current limits.
| Daily essential load | Illustrative array @ 4 peak sun hours | Illustrative array @ 3 peak sun hours | 1-day battery nameplate estimate |
|---|---|---|---|
| 500 Wh / day | ~167 W array | ~222 W array | ~735 Wh nameplate |
| 1,000 Wh / day | ~333 W array | ~444 W array | ~1,471 Wh nameplate |
| 2,000 Wh / day | ~667 W array | ~889 W array | ~2,941 Wh nameplate |
Use the estimate as a design brief
Start with essential loads and a conservative solar assumption. The result helps frame questions for site-specific production modeling and professional electrical design.
- List essential appliances, their running watts, daily hours, and any motor or compressor startup load.
- Use a conservative peak-sun-hours value for the least favorable season you expect the system to cover.
- Check production in NLR PVWatts, confirm site constraints, and have final electrical work designed and permitted correctly.
Common questions
Does this tell me how many panels fit on my roof?
No. It estimates energy capacity and a rough area. A site assessment must account for shade, orientation, setbacks, structure, wind or snow loads, equipment clearances, and local codes.
Why is battery capacity larger than one day of use?
Storage planning includes the autonomy period and conversion or usable-capacity assumptions. Real performance also varies with temperature, age, discharge limits, and equipment settings.
Can I use this as a final electrical design?
No. Verify solar production with a tool such as NLR PVWatts, confirm surge loads, and use qualified professionals for final equipment, permitting, and electrical work.
Plan first. Buy what is missing.
Compare solar-rechargeable 1 kWh LFP power stations
Verify solar input voltage, amp limits, and continuous AC output against your array and loads. These documented examples are not selected from your calculator answers.
Anker SOLIX
C1000 Gen 2
- Nominal capacity
- 1,024 Wh Manufacturer source for Nominal capacity (checked 2026-10-04; opens in a new tab)
When to consider another option 240 V loads, needs above the 2,000 W rated AC output, or a plan that depends on additional battery capacity.
Read the fit and limitations