Free UPS Battery Calculator

Name: Free UPS Battery Runtime Calculator
Author: ISPbox

Estimate battery backup runtime for WISP towers and server rooms.

System Configuration

Total Load (Watts)

W

System Voltage

Total Capacity (Ah)

Ah

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Global Estimated Runtime

13 h 36 m

This assumes 100% discharge (Deep Cycle). For standard Lead-Acid batteries, regular discharge below 50% significantly reduces battery life.

Detailed Metrics

Safe Runtime (50% DoD): 6h 48m
Current Draw (Amps): 6.3 A
Total Energy Storage: 2400 Wh

UPS Runtime Calculation for WISPs

Ensuring adequate battery backup for your tower sites is crucial for maintaining uptime during power outages. This calculator helps you estimate how long your equipment will stay online based on the battery bank capacity.

How it works

The formula used is: Runtime = (Battery Voltage × Battery Ah × Efficiency) / Load Watts. We use a standard efficiency factor of 0.85 to account for inverter losses, wiring resistance, and battery aging.

50% Depth of Discharge (DoD)

Standard Lead-Acid and AGM batteries should typically not be discharged below 50% capacity to maximize their lifespan. Deep cycle (Gel/LiFePO4) batteries may allow for deeper discharge (80-100%).