Estimating Energy Generated by your PV System
Using the equation below, you can estimate the annual electricity production and electric bill savings for a grid-connected home solar electric system with a net metering arrangement.
Determine the PV system’s size in kilowatts (kW).
A typical range is from 1 to 5 kW. This value is the “kW of PV” input for the equation below.
Based on your geographic location, select the energy production factor from the map below for the “kWh/kW-year” input for the following equation.
Electricity production from the PV system
kWh/year = (kW of PV) × (kWh/kW-year)
Calculate the watts if you know the voltage and amperage of a device.
Watts = Volts x Amps
If your T.V. plugs into a standard 120 volt receptacle and uses 4 amps, the total watts is calculated by multiplying 120 volts x 4 amps. That equals 480 watts.
120 Volts x 4 Amps = 480 Watts
Diagram of a simple solar stand-alone PV system
Some simple examples of rural off-grid power provision.