DC: Direct current (produced by solar panels)
AC: Alternating current (used in homes, business and industry)
Efficiency: Measure of how much of the sunlight is converted to electricity (%)
Capacity: Total amount of power that a system produces (also referred to as system size)
Watt (W): Basic unit of power
Photovoltaic (PV): photo = light, voltaic = produces voltage
Kilowatt (kW): A unit of electrical power equal to 1,000 watts (most common solar system measurement)
Kilowatt-hour (kWh): Basic unit of energy equal to the use of 1,000 watts of electricity for one full hour (basic unit of electrical usage billing)
The basic unit of energy: Energy = Power x Time.
Example: If ten 100-watt lightbulbs are left on for one hour, the energy consumed is 1 kWh (100 w x 10 = 1 kWh).