Inverter Battery Runtime Calculator
Calculate how long your inverter battery will last based on the connected load and battery capacity.
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Result
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Formula
Converts chemical energy capacity to watt-hours and divides by the power demand, adjusting for conversion losses.
Worked Example
Maximizing Battery Life
- Turn off non-essential appliances to extend runtime.
- Temperature affects battery capacity; keep them in a cool area.
- Lithium batteries offer higher usable capacity than lead-acid.
Regularly test your batteries to ensure they hold the expected charge.
You can also calculate changes using our Battery Backup Calculator or Inverter Load Calculator.
Frequently Asked Questions
Why 80% efficiency?
Inverters lose energy as heat during the DC to AC conversion process.
Can I discharge a lead-acid battery to 0%?
No, it significantly shortens life. This calculation assumes full capacity for simplicity, but 50% is recommended for lead-acid.
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