strategies for solar charging

[amirm]

Hello everyone. Just got a new solar charger to keep the batteries from self discharge (the boat is stored in a marina parking lot without access to AC so I can't charge it). The question is how to wire it.<br /><br />The most obvious option is to simply plug it into the cigarette lighter plug and set the battery switch to “both” to maintain both batteries (this is a smart panel with regulation). With this option I would need to leave the battery switch on which I prefer not to do, just in case I forget to turn something off.<br /><br />What do you all think? Is there a better way to do this?<br /><br />Thanks,<br />Amir

 

[Dunaruna]

Re: strategies for solar charging

What size panel(s)?

 

[amirm]

Re: strategies for solar charging

It is the small portable 2W unit from ICP Solar.<br /><br />Amir

 

[jlinder]

Re: strategies for solar charging

I saw those. I have got to question whether 2w is enough to do much for those batteries.<br /><br />You are talking about 150 ma total, or 75 ma per battery. And that is only under good sunlight.<br /><br />As for the connection, I would try a separate connector (fused) that does not go through the battery switch? Problem is that you would need to add something to drive both batteries. What about another solar panel and keep the bateries separate.<br /><br />BTW - 2 batteries. Is one starting and the other accessories? If so, I would concentrate on the starting battery. Keep it full and you can start the engine to charge the other battery.

 

[amirm]

Re: strategies for solar charging

Thanks for the response Jack. When I bought the unit a few months back (it was on sale at West Marine), I did not think about having to charge two batteries. Trying to charge both would be problematic both from current requirement as you say, and having to find a way to combine them for just this purpose. The alternative as you suggest is a good one. Namely, to get two units. Now, I have to wait for another sale on these things .<br /><br />BTW, the main use is during Winter time where the boat may sit around for 3+ months. For that reason, I need to keep both charged.<br /><br />Amir

 

[cuzner]

Re: strategies for solar charging

If you leave it on for long periods of time you should add a solar controler.Keeps your batteries from being overcharged. 3 years ago I left a larger (6 watt) charger on over the winter, overcharged and ruined my batteries.18 volts over a long period (months)isn't a good idea!!!!<br /><br /> Jim

 

[jlinder]

Re: strategies for solar charging

I have found it on sale for $66 right now on the web. Just look.<br /><br />I am reluctant to post where as I think that would be against forum rules, and I would not like to bite the hand that feeds me.

 

[amirm]

Re: strategies for solar charging

Jim the solar charger I have has a built-in regulator and overcharge protection. That's why I got it. I fully agree that using a one without a controller is a bad idea.<br /><br />Amir