Shore power with a good charger. You batts will lose (assuming wet cells) about 5%/month just sitting there.Yes, it's true, I don't know a thing about marine wiring. In general, what is the most cost efficient way to keep batteries charged while dry docked in the winter?
SD,Why would anyone design a solar panel that way. It doesn't make sense and would increase the cost of the panels incredibly. Solar panels are generally used to charge batteries. As such, they need to output relatively low voltage DC... trying to convert the low-voltage DC output to a high voltage AC output would require fairly sophisticated and inefficient hardware—specifically an inverter. Then to use the electricity on the boat, say to charge the batteries, you'd have to convert it back to DC... incurring even further losses.
The most cost efficient way to keep the batteries charged when dry docked is to take them home and put them on a three-way smart charger about once every two weeks.
Then you are probably best off just not worrying about the batt (if there is no electricity there) or pulling it out and throwing it in your garage with a cheap little portable charger like you get from Walmart or something.Yes, it's true, I don't know how they work (didn't I write that already).
I just purchased a 31' Sloop, my first sailboat, and I plan on taking it to a marina in the next couple weeks to have it stored for the winter. It has one engine battery and two house batteries, but I don't know the exact size of the batteries.
Remove them from the boat, bring them home to your garage and charge them with the use of a charger that is protected and will not overcharge.Yes, it's true, I don't know a thing about marine wiring. In general, what is the most cost efficient way to keep batteries charged while dry docked in the winter?
If you have gells, you will have very little self discharge. In that case, just turn off the batt switch and come back in Spring. Maybe even disconect the terminals?? I do not think I would even go to that much trouble.Yeah, I think you're right. I'm just going to leave them be and take my chances in the spring. The broker said something about having gel batteries. Does that make any difference?