A Megawatt is simply 1,000,000 watts of electricity or 1000 kilowatts of power. A watt of electricity is a measure of power.
Power in turn is a function of the voltage of a circuit multiplied by the current.
Power= Current (Amps) x Voltage
A Megawatt hour is a measure of total energy and it refers to the amount of energy over a period of time:
1 Megawatt hour is equivalent to 1,000,000 watts of power being used or generated for one hour.
So if you were generating 1,000 watts for 1,000 hours you would generate 1 Megawatt hour (MWh).
If you were generating 10,000,000 watts for 6 minutes continually then you would generate 1 Megawatt hour (MWh).
Megawatt hours is the standard unit in which power is bought and sold at the wholesale level in contracts between power generators and utility companies. It is not the unit of power that you would typically see on your bill.
Find out how much a solar system produces in your area!