Battery Storage Calculator
Estimate how much battery capacity you need to backup your essential loads during a power outage.
Backup Requirements
How much power you need per day during an outage.
How many days you need to run on battery power without any sun to recharge it.
Modern lithium batteries can discharge 90-100% of their capacity safely.
Total Recommended Capacity
Real-World Equivalent
To meet this requirement, you would need approximately 2 standard home batteries (assuming ~13.5 kWh per battery, like a Tesla Powerwall 3 or Enphase IQ 5P pairs).
Disclaimer: The results provided by this tool are estimates intended for educational purposes only. They rely on the assumptions and average values provided in the inputs.
True costs, savings, and system designs depend heavily on your specific roof, local utility rates, and actual equipment choices. For exact figures and custom system design, you should consult directly with a local solar installer.
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