Calculadora de Dimensionamento de Bateria UPS
Calcule a capacidade de bateria UPS necessária para sua carga e autonomia.
80% for lead-acid, 90% for Li-ion
Required Battery Capacity
28.9 Ah
Required Battery Capacity vs Desired Runtime
Formula
UPS Battery Sizing
Proper battery sizing ensures the UPS provides the required runtime at the expected load.
Formula
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).
Sizing Considerations
Exemplo Resolvido
2000 W load, 30 min runtime, 48 V battery, 90% inverter efficiency, 80% DOD.
- 01Runtime in hours: 30 / 60 = 0.5 hours
- 02Actual draw: 2000 / 0.90 = 2222 W
- 03Capacity: 2222 x 0.5 / 48 / 0.80 = 28.9 Ah
- 04Energy: 2222 x 0.5 / 0.80 / 1000 = 1.39 kWh
- 05Discharge current: 2222 / 48 = 46.3 A
Perguntas Frequentes
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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