Solar Power and Battery System Calculator

Parameter	Value
Total number of solar panels	quantity
Single Solar Panel Height in millimetres (mm)	mm
Single Solar Panel Width in millimetres (mm)	mm
Single Solar Panel Power Output in (watts)	watts
For more solar panel specifications see Solar Panel Calculator
Batteries Size	12 volts 31 Ah 372 Wh 12 volts 50 Ah 600 Wh 12 volts 80 Ah 960 Wh 12 volts 120 Ah 1440 Wh 12 volts 185 Ah 2220 Wh 12 volts 240 Ah 2880 Wh 12 volts 420 Ah bank 5520 Wh 12 volts 500 Ah bank 6000 Wh 12 volts 600 Ah bank 7200 Wh 12 volts 1200 Ah bank 14400 Wh 12 volts 1400 Ah bank 16800 Wh 12 volts 1700 Ah bank 20400 Wh 24 volts 250 Ah bank 6000 Wh 24 volts 400 Ah bank 9600 Wh 24 volts 500 Ah bank 12000 Wh 24 volts 600 Ah bank 14400 Wh 24 volts 750 Ah bank 18000 Wh 24 volts 900 Ah bank 21600 Wh 24 volts 1200 Ah bank 28800 Wh 24 volts 1400 Ah bank 33600 Wh 24 volts 1700 Ah bank 40800 Wh 24 volts 2300 Ah bank 55200 Wh 24 volts 2900 Ah bank 69600 Wh 24 volts 3500 Ah bank 84000 Wh 48 volts 300 Ah bank 14400 Wh 48 volts 400 Ah bank 19200 Wh 48 volts 600 Ah bank 28800 Wh 48 volts 750 Ah bank 36000 Wh 48 volts 900 Ah bank 43200 Wh 48 volts 1200 Ah bank 57600 Wh 48 volts 1400 Ah bank 67200 Wh 48 volts 2300 Ah bank 110400 Wh 48 volts 2900 Ah bank 139200 Wh 48 volts 3500 Ah bank 168000 Wh
Your local average daily Solar Radiation World Map Solar Radiation (kWh/m2/day)	kWh/m2/day
Life span in years	years

Press this button after adjusting values in the top table. Results are in the lower table.

Solar Power Battery System Results

Solar Power Usage Suggestions

• Try to arrange electricity loads for daytime hours. This avoid battery charging losses.
• Keep the solar panels clean for better efficiency.
• Arrange the solar panels so there is some natural cooling. Solar panels are more efficient when cooler.
• Select DC appliances to minimize the inverter size required. Avoids the losses of an inverter.
• AC Transfer switches can allow a generator to start automatically if the battery voltage is too low.
• Allow for some seasonal solar radiation variation

Load Calculation for Solar Power Battery System

Enter the appliance name, the typical power in watts it uses and the hours per day average use.
Use the combined total to size your solar and battery system.
For some appliances consider the duty cycle when actually using power. e.g. fridges. See Appliance Energy Calculator for appliance power load values.