Solar payback calculator
Estimate system size, cash cost, annual savings and payback using your bill and editable local assumptions.
Calculate payback →Published guides
Start with your state
Four guides are live while the wider state library is rebuilt and sourced properly.
Free calculators
Useful answers, not a lead form
Run solar economics, battery sizing and runtime calculations with visible assumptions. No email required.
Home-backup sizing
Add appliances individually to estimate daily energy, rated capacity and simultaneous output.
Size a battery →Power station runtime
Calculate battery runtime or reverse the formula to find the watt-hours needed for a target duration.
Calculate runtime →
Home backup power
Product guides built around use cases
Coverage uses published specifications, warranty terms, pricing, and owner feedback unless physical testing is explicitly stated.
Home-backup sizing worksheet
Interactive capacity and output calculator
Your loads
Size your backup →
Portable power station buying guide →
EcoFlow DELTA Pro
Expandable portable power station · home-backup guide
3.6 kWh base
Read the guide →
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