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Battery Bank Size
Bank Ah + count for autonomy-driven off-grid storage.
BatteryCore inputs only — quick sizing with engineering defaults.
Inputs (SI units)
Results
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Engineering Formula
- E_req = Load × Days / (DoD × η)
- C_ah = E_req × 1000 / V_bat
- N_blocks = ⌈C_ah / C_block⌉
Usable storage accounts for DoD ceiling and round-trip efficiency. Bank Ah follows from E=Q·V. Lead-acid ≤ 50% DoD; LFP up to 90%.
Step-by-step Calculation
- 1.Usable
DoD × η73.6 % - 2.Energy
Load × Days / usable27.17 kWh - 3.Ah
kWh×1000/V566 Ah
Design Assumptions
- • Constant discharge to reach autonomy over full days.
- • Temperature 25 °C (derate 1%/°C below 20 °C for lead-acid).
Engineering Tips
- ◆Prefer 48 V DC bus over 12/24 V for > 3 kW loads.
- ◆Use LFP for daily-cycle systems (> 3,000 cycles).
Warnings
- ▲Never parallel more than 4 lead-acid strings.
- ▲Follow BMS SoC limits — over-discharge voids warranty.
Standards & References
IEC 62619 (Li-ion)IEC 61427 (Lead-acid for RE)IS 16270