Depth of discharge calculator

Turn a nominal kWh and a depth of discharge (DoD) limit into usable kWh, then see how long a throughput or cycle cap lasts at your daily use.

Read this first. Every default is an invented placeholder, not a product's data or a real warranty. Read the DoD limit and the warranty terms from the maker's own documents. Use a dot for decimals; "10,000" is read as ten thousand. Part 1 counts a cycle as kWh out divided by usable kWh, which may not match your warranty's cycle definition. No capacity fade or efficiency is modelled.

1. Usable energy and warranty years

Nominal energy (kWh) DoD limit (%) Energy delivered per day (kWh out) Warranty term (years) Throughput cap (MWh out, 0 if none) Cycle cap (cycles, 0 if none)

Result	Value
Usable energy (nominal × DoD limit)	-
Daily energy as a share of nominal, and of usable	-
Cycles per day, counted as kWh out ÷ usable	-
Energy out per year	-
Years until the throughput cap is reached	-
Years until the cycle cap is reached	-
Which limit comes first	-
Energy out by that point	-

2. Nominal kWh needed for a usable target

Usable energy needed (kWh) DoD limit (%) Module size, nominal (kWh, 0 to skip)

Result	Value
Nominal energy needed (usable ÷ DoD limit)	-
Modules needed, and usable kWh they give	-

If the sheet lists usable energy as AC delivered or DC stored, check which basis it uses before comparing.

Method: usable = nominal × DoD limit, the relation OpenSolar's help page states for its battery model. Years to cap = cap ÷ (daily kWh out × 365).