Solar Battery Size Calculator: How Much Storage Do You Need?
A solar battery storage system lets you store excess solar energy for use at night or during power outages. Properly sizing your battery ensures you maximize self-consumption and minimize grid dependence.
This calculator estimates the battery capacity you need based on your daily energy usage, desired backup hours, and solar production. It also estimates the number of Tesla Powerwall equivalents and total cost.
Battery prices have dropped significantly, from $1,000+/kWh in 2015 to $400-$600/kWh today. With the 30% federal tax credit, battery storage is increasingly affordable for homeowners.
For related tools, see our solar panel ROI calculator and solar savings calculator.