Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Solar Energy
Solar Battery Size Calculator
Calculate required battery capacity (kWh) to back up a home for a chosen number of days at a given daily energy usage and battery depth-of-discharge limit. Use it when sizing storage for solar self-consumption, grid-outage backup, or off-grid systems.
Fill in the required fields to see your result.
Solar Energy
Solar Payback Period Calculator
Calculate how many years a solar PV system takes to pay back its net upfront cost through annual electricity bill savings. Use it as the primary financial test when evaluating whether to install solar.
Fill in the required fields to see your result.
Key differences
| Solar Battery Size Calculator | Solar Payback Period Calculator | |
|---|---|---|
| Category | Solar Energy | Solar Energy |
| Inputs required | 3 | 3 |
| Result | Required Battery Capacity (kWh) | Payback Period (years) |
| What it does | Calculate required battery capacity (kWh) to back up a home for a chosen number of days at a given daily energy usage and battery depth-of-discharge limit. Use it when sizing storage for solar self-consumption, grid-outage backup, or off-grid systems. | Calculate how many years a solar PV system takes to pay back its net upfront cost through annual electricity bill savings. Use it as the primary financial test when evaluating whether to install solar. |