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UPS Uptime Calculator


This tool assumes you know what your doing, and does not currently employ any error or safety checking. The calculation is currently very basic and should be used as a rough guide only.
If you blow yourself, your UPS, or anything else up, its YOUR FAULT!!!!
Basic calculation used is: (power efficiency * battery volt * AH)/load in watts)

UPS Size (VA) VA
Power Efficiency
(Usually 0.9 on higher)
Voltage Input (AC) V
Voltage Input (DC) VDC
Number of Batteries
Battery Voltage (Each) VDC
Battery AH Rating (Each) Ah
Equipment Draw (Watts) W
Uptime will be: NANh NANm NANs