*Note: This is only for the purpose of estimating the required system.
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**Using a 12V DC, the calculation is as below:
Power Load × Working Hours = A (Wh)
A (Wh) ÷ 12V =B (Ah)
B (Ah) × Days = C (Ah)
C (Ah) ÷ 70% = D (Ah)
So now the battery data is D(Ah) / 12V
B(Ah) × 17 or (the actual Voltage of the pannel) ÷ Sunshine Hours = E (Wp)
E (Wp) × 1.3 = F(Wp)
So now the Solar Panel Wattage is F(Wp)
F(Wp) ÷ 17 or (the actual Voltage of the pannel)= G(A)
G(A) is the controller needed in this solar system.
***Additional Details :
1) Power Load is the wattage of the loaded lights.
2) Working hour is how many hours you want the lights to work per day.
3) C (Ah) ÷ 70% = D (Ah), because there is some wastage when the lamps work, so we usually use a little bigger battery.
4) Usually, the Sunshine hour is 3 or 4 or 5 hours per day. It is different in different area.
5) E (Wp) × 1.3 = F(Wp), Usually, we need to use a little biger solar panel to make more power to stock in the battery, then we can use the lamp if no sunshine next day.
6) B(Ah) × 17 or (the actual Voltage of the pannel)÷ Sunshine Hours = E (Wp), The standard Voltage of the solar panel is 17V.