Re: Solar car battery charger

On 2024-11-04 05:58, Charlie wrote:

I have a project I've been wanting to create for years which is a solar spa
where the entire setup runs off the grid completely. No 120VAC is desired.
 I already have an RV pump which pumps water from the spa back to the spa
(after running it through a long black hose of probably hundreds of feet).
<https://www.amazon.com/dp/B0DF7B1VYD>
 I tested that pump today on an old battery and it seems to be working.
a. It pulls water out of the spa via a garden hose on the pump input.
b. And it puts it back via a garden hose on the pump output into the spa.
 The specs on that RV pump are 12VDC, 4.65Amps, 8.0 Amps maximum.
 I have three spare car batteries (which probably aren't in the greatest of
shape as they're old batteries which friends discarded & gave to me).
 All I need now is the solar panel setup. But I know nothing about solar.
 I'm sure I need a panel and some way to control the battery charging.
 What kind of panel do you think I need?
And does it need some kind of control module to charge a car battery?

You don't need a battery: just run the pump directly from the solar panel. If the solar panel doesn't generate electricity, it means there is no sun, so no heating the water either.
You may need a voltage limiter, perhaps.
--
Cheers, Carlos.