DoD
DoD (depth of discharge) states how much of the nominal capacity is actually withdrawn: 90 % DoD on 200 kWh means 180 kWh are used.
What does DoD mean?
Depth of Discharge states how much of the nominal capacity is actually withdrawn. 90 % DoD on 200 kWh means: 180 kWh are used, 20 kWh remain in the cell as a reserve.
Modern LFP systems permit high depths of discharge (sometimes 100 % per datasheet), but DoD remains a design lever: cycling shallower slows ageing — exhausting the warranted capacity is paid for in lifetime.
What matters in practice
- usable capacity = nominal capacity × DoD — calculate with nothing else
- datasheet DoD and warranty DoD can differ
- a backup reserve reduces the everyday usable depth of discharge
- respect BMS limits: deep discharge is a damage event
Practical example
A system “with 215 kWh” runs 90 % DoD in daily operation and holds a 30 % backup reserve. Effectively it shifts about 130 kWh per day — that number, not the 215, belongs in the economic analysis.
The Speichercampus perspective
Speichercampus always converts offers to usable capacity at real DoD — the honest comparison figure behind the catalogue number.