What is the wattage of the pump?
How many hours will the pump be running?
How many amp hours are in the battery?
How many hours of sunlight are you going to get per day?
If the pump is ran for 10 hours at 50 watts you have 500 watts.
If the battery has a 100 amp hour rating you would have 1200 watts in battery power. So about two hours and the battery is so dead it will not be able to recharge. Never run a battery under 50% discharge. So you will get one hour from the battery.
Your 45 watt solar panel will only be putting about 80% of it's rated power at most into the battery. That would mean it would need 13.8 hours of sun light to put the charge back in the battery.
At a wild guess with what you have you might get lucky and keep the pump running for about 10 hours but you woud have to let it charge for the next day or two to get the battery charged back up.
Don't forget to put a charge controller on the system or you could over charge the battery. You can get one with a low voltage disconnect so it will turn off the pump when the battery gets too low.
Now if it is an AC pump you will have to add an inverter. That takes any where from 10% to 20% more power. So to me you should get three of those 45 watt panels and a good controller and maybe a couple of large deep cycle batteries.
If you pump only uses 5 watts in power to run. You are over powered already.
Good luck,
2 years ago
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