Charging a car battery via a solar panel

[weijing3333]

Charging a car battery via a solar panel
Hi everyone.I want to keep a car battery at my camping site. I will use it at most once a week and will tap at most 30 to 40 amps out of it.What is the minimum size solar panel that will put back this amount of power into the car battery over a period of 6 days?What controller will be needed?

 

[PhilH]

You need to work out how many amps for how many hours to be able to make this calculation.

 

[spinball]

That is not such a simple equation. Greatly depends on sun angle relative to PV panels, cloud cover, etc. You can buy solar controllers that go between the PV and batteries to manage this. You can't connect a panel directly to a battery--It would not know when to stop charging.

There are plenty of websites out there covering solar.