Battery economics, the toy version.

Grid-scale storage in six numbers: what a battery earns from arbitrage and how long it takes to pay itself back. Live and clickable — the point of this site.

Power (MW)Duration (hours)Capex ($/kWh)Avg daily spread ($/MWh)Cycles per dayRound-trip efficiency

10.4 yrssimple payback

$9.6mannual arbitrage revenue

$100.0mcapex (200 MWh)

A toy, deliberately: one revenue stream, no degradation, no FCAS. The essays cover what it leaves out.