Option A power-and-hours savings calculator

Measured power differences and justified operating-hour estimates determine this isolated lighting saving.

S = \frac{N \times \left(W_{b} - W_{r}\right) \times h}{1000}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

S = \frac{240 \times \left(72 - 31\right) \times 3200}{1000} = 31{,}488

Symbol	Meaning	Unit
$S$	annual isolated energy saving	kWh/yr
$N$	number of devices	unit
$W_{b}$	baseline measured device power	W/unit
$W_{r}$	reporting measured device power	W/unit
$h$	agreed annual operating hours	h/yr

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.