What's a Watt?
Watts tell us how much power a device uses in the moment. For example, a brighter light bulb uses more watts than a dimmer one.
Watt Hours Are Important
Watt hours (or watts per hour) tell us how much power is consumed over time. Battery system capacity is mostly measured in Watt hours. Calculating watt hours is easy. Simply multiply the power of the device (watts) x the hours used each day.
Well, that’s a bit tricky. You can:
Now you are getting into electricity 101! Amps refer to the flow of electricity through a wire. Volts refer to how fast the flow of electricity moves through the wire. If you know the values for both amps and volts, the formula is easy: Amps x Volts = Watts
Finding accurate voltage information for your device might be a challenge. So when in doubt, use the strategies from the list above to find out how many watts your device uses or consult with a qualified electrician.
Calculate Your Total Power Consumption
Add up the watt hours (consumption) for each of your important devices
. The result will be your power needs per day. You can use this number to shop for the correct size battery backup system.
A Sample Calculation
(Watts x Time)
|8 hours (33% duty cycle)