UPS电池容量计算器

计算不间断电源（UPS）所需的电池容量，根据负载功率、后备时间和效率参数选择合适的UPS电池配置。

总负荷

Desired Runtime

min

Battery Bank Voltage

Inverter Efficiency

Max Depth of Discharge

80% for lead-acid, 90% for Li-ion

Required Battery Capacity

28.9 Ah

Battery Energy1.39 kWh

Discharge Current46.3 A

Actual Battery Draw2,222 W

Required Battery Capacity vs Desired Runtime

公式

Proper battery sizing ensures the UPS provides the required runtime at the expected load.

Capacity (Ah) = (Load / Efficiency) x Runtime (hours) / Battery Voltage / DOD

Where DOD is the maximum depth of discharge (80% for lead-acid to extend life, 90% for lithium).

Battery capacity degrades over time (plan for end-of-life capacity)

Temperature affects capacity (reduce by 1% per degree C below 25 C)

Higher discharge rates reduce effective capacity (Peukert effect for lead-acid)

2000 W load, 30 min runtime, 48 V battery, 90% inverter efficiency, 80% DOD.

Should I oversize the battery?

Yes. Add 20-25% margin for aging, temperature, and Peukert losses. Replace batteries when capacity drops to 80% of rated.

Lead-acid or lithium for UPS?

Lead-acid is cheaper upfront but heavier and shorter-lived. Lithium costs more but offers 2-3x cycle life, lighter weight, and deeper discharge.

How does temperature affect UPS runtime?

Cold reduces battery capacity (typically 1%/C below 25C). Heat shortens battery life (halves for every 10C above 25C).

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