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Battery Size Calculator

Calculate the battery size you need from your load list and backup time.

Enter load name, running power, quantity, and backup hours to estimate the right battery capacity.

Start Battery Calculation Get Battery Recommendation

Calculator

Use this battery size calculator for home backup, solar storage, and small business backup sizing.

Enter Your Loads

Load Name Running Power (W) Quantity Backup Hours
Optional Settings

Use this battery size calculator for solar when you need stored power for night use, outage backup, or essential loads.

Load Examples

Use the watt rating on the appliance or equipment label.

Home Loads

Business Loads

Solar Backup Loads

  • Solar panels
  • Inverter
  • Battery storage
  • Night use
  • Backup output

Battery Size Result

Your result shows how many kWh you need.

  • Energy Needed

    Power demand from your selected loads and backup hours.

  • Recommended Battery Size

    Battery capacity adjusted for usable energy, inverter loss, and safety margin.

  • Product Direction

    The battery bank size calculator result points to a 5kWh Battery, 10kWh Battery, 15kWh Battery, 20kWh Battery, or 50kWh Battery.

Capacity Match

  • 5kWh Battery

    For WiFi, lights, phone charging, security, and small backup loads.

  • 10kWh Battery

    For refrigerator, WiFi, lights, TV, and standard home backup.

  • 15kWh Battery

    For longer night use, more home loads, and larger solar homes.

  • 20kWh Battery

    For larger homes, more essential loads, and higher evening power use.

  • 50kWh Battery

    For POS, freezer, water pump, office, small business, and commercial backup loads.

Project Videos

  • Home Battery Installation

    Battery placement, wiring, and inverter connection.

  • Solar Battery Charging Test

    Solar panels charging the battery during the day.

  • Power Outage Switching Test

    Backup output for refrigerator, lights, WiFi, and selected loads.

  • Commercial Backup Test

    POS, freezer, lighting, router, and small business backup loads.

FAQ

How do I use the battery size calculator?

Enter each load, running power, quantity, and backup hours. The calculator estimates the kWh needed and suggests a matching battery size.

What loads should I enter?

Enter only the loads you want to keep running, such as refrigerator, lights, WiFi, TV, POS system, freezer, water pump, security system, or home office equipment.

Can this solar battery size calculator work for home solar systems?

Yes. Use it to estimate storage needs for solar backup, night use, and essential home loads. Solar production and inverter compatibility still need to be checked.

Is a 10kWh Battery enough for home backup?

10kWh Battery capacity can support refrigerator, WiFi, lights, TV, and selected home loads. HVAC, pumps, large appliances, or whole-home backup need separate load calculation.

Can this battery backup size calculator be used for business loads?

Yes. POS systems, freezers, routers, lights, pumps, and office equipment can be entered as loads. Startup current and inverter output should also be checked.

Why is the recommended battery size larger than my load calculation?

Battery sizing needs usable capacity, inverter loss, depth of discharge, and safety margin. The final battery size should be larger than the exact energy number.

Can I use the result to choose a product directly?

Yes, for initial selection. Final product choice should still check load type, inverter output, battery voltage, installation space, and expansion needs.

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