Home Battery Usable Capacity Calculator
Calculate nominal usable energy from nameplate capacity, depth of discharge and your round-trip efficiency.
Capacity 0–10⁶ kWh; DoD and round-trip efficiency 0–100%. Enter nameplate, not an already usable rating. All round-trip losses are applied to output. No assumed manufacturer values; aging, temperature and standby consumption are excluded. This is not system design.
Eₑ = E × DoD/100; Eᵤ = Eₑ × η/100; Wh = kWh × 1000
Inputs stay in this browser. Values shown use at most 6 decimal places; money uses 2, in the currency you entered. Counts round upward.
Results
- Dischargeable energy (kWh)
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- Usable energy (kWh)
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- Usable energy (Wh)
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A QUICK WALKTHROUGH
How to use this tool
- Enter your values in the displayed units.
- Calculate and read the assumptions with the result.
Formula and limits
Capacity 0–10⁶ kWh; DoD and round-trip efficiency 0–100%. Enter nameplate, not an already usable rating. All round-trip losses are applied to output. No assumed manufacturer values; aging, temperature and standby consumption are excluded. This is not system design. Eₑ = E × DoD/100; Eᵤ = Eₑ × η/100; Wh = kWh × 1000
Local processing
Inputs stay in this browser. Values shown use at most 6 decimal places; money uses 2, in the currency you entered. Counts round upward.
GOOD TO KNOW
Common questions
Are these recommendations?
Only your inputs are calculated; no engineering, installation or safety assessment is provided.