Let''s say you have a 100 watt load that needs to be operated for approximately 10 hours, in that case the total power required could be estimated simply by multiplying the load with hours, as given under 100 Watts x 10 hours = 1,000 Watt hours. This becomes the absolute power necessary from the panel.
Therefore taking into account the 4 to 5 hours sunshine per day consideration, we calculate the true power for the solar panel which would enable your load to keep running throughout the year . 1,000 Watt hours / 5 hours sunlight = 200 Watt solar panel.
1,000 Watt hours / 5 hours sunlight = 200 Watt solar panel. 3) Once you have calculated the solar panel as per the above calculations, it''s time to calculate the AH rating for the batteries that might be required for operating the specified load under all conditions. If the selected battery is rated at 12V, in that case:
We know the famous power formula (DC) P = VI (Power = Voltage x Current) Putting the values of batteries and charging current. P = 12V x 20 A P = 240 Watts these are the required wattage of solar panel (only for battery charging, and then battery will supply power to the load i.e. direct load is not connected to the solar panels) Now
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