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Ah, yes... I needed new batteries too after I connected the cheap car charger that came with the boat and left it for a week. The charger was permanently connected to the batteries and rattled around under the seat with the 120 volt cord hanging out for easy access. What could possibly go wrong with this setup? We keep ours on a trailer in our yard during the off season and periodically I would smell a distinctly pungent odor when I would walk past the boat. Assuming it was my neighbor's septic tank in need of a pumpout, since ours was recently done, I thought nothing more of it. I finally came to my senses when I realized it was hydrogen gas from my boiling batteries. I was lucky to not have it explode.
I could write a book about my whole process and not all of it is as interesting as I think it is. I did a lot of online research, which links I will share with you. I am also a licensed master electrician in the State of Washington, but do not take that to mean it was a piece of cake for me. There are charts for calculating loads and determining wire sizes, which do not correspond to the National Electrical Code, so start over. You must prioritize what you intend to do with the boat, assess your current electrical system condition, honestly assess your skill level and learning aptitude and check your bank balance. I know all you need is new batteries. That was my situation. Honestly, I probably could have simply replaced them and been fine for a while, but I am too curious.
First, I had to get to the batteries. They were buried under the
floor boards under the seat, next to the engine. No access panel. I did not know how many batteries I had or if they were still using the original diode charging/semi-isolation system that came with the boat or what. What connections I could see were not encouraging. All my engine wiring, thankfully there is damn little if your boat is fairly pristine, had cooked ends at their terminations. Simple enough to replace a half-dozen wires I thought, then I found a two foot loop in the harness coiled up under the non-removable
floor boards. Saints preserve us!
Then I found a fancy-dancy Perko Isolation 4 position switch! A real expert must have overhauled this baby! Big and Red and Official! It was set to “Both”. Installed in a totally inaccessible location, with no apparent thought for actual operation or maintenance. But it was Fancy-Dancy. Then I knew I was in for the long haul.
As for your situation, maybe a real expert already upgraded your electrical system and you just need new batteries. And all the children live in perfect peace. If so, replace them with what you already have. If they are AGM, you are way ahead of me and need to talk to Steve, Desert Albin guy. If conventional lead acid 12 volt, shop around. There is a lot of information out there about deep cycle, starting and combination batts. Go with the combination, but don't believe all their hype. You will have to buy new batteries again at some point. (Somebody may have installed AGMs with no upgrade in charger, monitoring or thought given to actual use. Caution, they require specific add-ons and do not just plug into the conventional lead acid set-up.)
Not knowing your specific situation, I will stop with a must-read-if-tedious link and a few pictures of part of my upgrade. I will try to answer any of your questions and am willing to speak directly if it seems helpful. Regards, Rick.
http://forums.sailboatowners.com/index. ... gs.137615/
ps. "cover removed"photo needs 90 degree rotation clockwise. D.... smart phones, my a.....
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