Solaris ReserveCAPACITY SIZING

What Size Solar Generator Do You Need?

A defensible estimate is built from loads, runtime, surge demand, and a realistic reserve—not guesswork.

01

List the Devices That May Run Together

Output capacity must cover the combined running watts of devices operating at the same time. Refrigerators, pumps, and power tools may briefly require higher startup power, so check their published surge requirements.

02

Estimate Daily Energy

Measured-load method24-hour appliance Wh × outage days = load energy

Cyclic appliances need a longer measurement. Do not treat one momentary refrigerator reading as its daily energy use.

For the complete measurement, startup, food-safety, and recharge method, open the refrigerator and freezer backup-power guide.

Air conditioning changes rapidly with weather and thermostat behavior. Use the separate air-conditioner backup-power guide instead of applying a mild-day wattage reading to a heat emergency.

03

Add Real-World Margin

A planning margin helps account for inverter losses, aging, cold or hot temperatures, and loads running longer than expected. Avoid treating the battery’s advertised watt-hour number as completely usable energy.

  • Confirm continuous AC output
  • Confirm startup or surge capability
  • Check usable capacity information
  • Allow room for unexpected runtime
  • Verify solar input voltage and connector limits
04

Use This Decision Shortcut

If your priority is…Start researching…
Phones, lights, laptop300–700 Wh
Internet plus selected essentials700 Wh–1.5 kWh
Managed refrigerator backup1–2 kWh
Longer or heavier household loads2–5+ kWh, often expandable

Ranges are educational starting points. Measure or verify your actual loads before buying.

Apply the Estimate

Return to the Solaris Power Match tool and choose the devices that matter to your household.

Open Power Match