PV system sizing made easy.

Step 1: Determine Power Consumption Loads

		Total AC Load / Watt Hours per Week
		Total DC Load / Watt Hours per Week
		DC System Voltage ( usually 12, 24, or 48 volts)

Step 2: Sizing the Battery Bank

		Required days of Autonomy  ( no Sunshine)
		Battery Bank Depth of Discharge %  ( if discharge limit is 20%, use 0.2) Do Not Exceed 80%!
		Select Multiplier that corresponds to average winter temperature
		Ambient Temperature Multiplier   80F        26.7C        1.00   70F        21.2C        1.04  60F        15.6C        1.11   50F        10.0C        1.19   40F        04.4C        1.30   30F        n1.1C        1.40   20F        n6.7C        1.59
		Amp-Hour rating for Selected Battery

Step 3: Determine Daily Available Sun Hours

		Sunshine Hours per Day ( use the Winter Average for Year Round Autonomy)
		Daily Sun Hours Chart - National Solar Insolation Map - World