Grid-tie basics -How much power must I produce to offset 30% of my utility bill?
How much power must I produce to offset 30% of my electricity bills?
For the sake of an example, consider that you use 30 kWh per day in your home. (Check your monthly energy bill to confirm your actual daily energy consumption). If you were to produce 10kWh per day (30 kWh x 30% = 10 kWh) then you would, in fact, offset 30% of your daily energy consumption. To produce 10 kWh per day in a location where you receive an average of 4 sun hours per day would mean you need a 2.5 kW system (10 kWh / 4 hours = 2.5 kW).