D
David Williams
- Jan 1, 1970
- 0
-> If I have a device that consumes 120W of power and its needs to run
-> for 2hrs at night, then I will need the following:
So you need 240 watt.hours.
-> - a battery that runs at 12v with a minimum capacity of 200Ah (120W/
-> 12v * 2hrs) or a 6v battery with a capacity of 400Ah
12v x 200Ah is 2400 watt.hours, ten times more than you need. Ditto for
the 6-volt case.
Of course, it would be better to have more capacity than you need.
Batteries perfer not to be deeply discharged. But a factor of ten is
probably over-doing it!
-> - a 120W PV module in an area with 2hrs of solar insulation...or a 60W
-> PV module placed in an area with 4hrs of solar insulation?
InsOlation.
You'd probably need more than that. The efficiencies won't be 100
percent. Double or triple it.
dow
-> for 2hrs at night, then I will need the following:
So you need 240 watt.hours.
-> - a battery that runs at 12v with a minimum capacity of 200Ah (120W/
-> 12v * 2hrs) or a 6v battery with a capacity of 400Ah
12v x 200Ah is 2400 watt.hours, ten times more than you need. Ditto for
the 6-volt case.
Of course, it would be better to have more capacity than you need.
Batteries perfer not to be deeply discharged. But a factor of ten is
probably over-doing it!
-> - a 120W PV module in an area with 2hrs of solar insulation...or a 60W
-> PV module placed in an area with 4hrs of solar insulation?
InsOlation.
You'd probably need more than that. The efficiencies won't be 100
percent. Double or triple it.
dow
