Discharge energy is the kWh you actually pull from the bank each cycle—not the full nameplate. This guide walks through the DoD and battery discharge energy calculator: nominal capacity, DoD %, and the discharge yield available to inverters and loads.
Benefits
- Discharge energy (usable) = nominal kWh × (DoD ÷ 100).
- Shows reserved kWh held above your discharge floor.
- Compare discharge yield across 50%, 80%, and 90% DoD policies.
How it works
- Enter nominal bank kWh from module sticker or datasheet.
- Set planned depth of discharge % for the cycle you are modeling.
- Read discharge energy in kWh and Wh—the yield per discharge event.
FAQ
What is battery discharge energy at a given DoD?
Discharge energy ≈ nominal kWh × (DoD ÷ 100). Example: 20 kWh nominal at 80% DoD → 16 kWh discharged per cycle; 4 kWh remains as reserve above the floor. That 16 kWh is what loads can consume before hitting the BMS low-voltage cutoff.
How is discharge energy different from energy yield?
In planning terms they are the same usable energy released between charge top and discharge floor—yield per cycle. Marketing yield sometimes includes round-trip efficiency; this calculator gives gross discharge kWh from capacity and DoD before inverter and cable losses.
Does a deeper DoD always mean more discharge energy?
Yes, mathematically—higher DoD % multiplies more of nominal kWh into discharge energy. But deeper daily DoD reduces cycle life for most chemistries. Compare discharge kWh at 80% vs. 90% DoD, then weigh autonomy against replacement interval.
Technical specifications
- Discharge kWh = nominal_kWh × (DoD% ÷ 100).
- Reserve kWh = nominal − discharge_kWh.
- Discharge Wh = discharge_kWh × 1,000.
- Related: battery-depth-of-discharge, battery-dod-to-usable-energy-calculator.