Guest Posted March 24, 2011 Share Posted March 24, 2011 Hi Gang, My qustion is will a standard mains battery charger charge all three batteries if I connect it to any one of the + an - connecting terminals ? Quote Link to comment Share on other sites More sharing options...
mbird Posted March 24, 2011 Share Posted March 24, 2011 It should be fine, yes, but I think that largely depends on the size of charger you have. I have a bank of two batteries, and the charger is connected to one of them, so yes it will work fine, as that is how most boats do it. If you only have a very low capacity charger, though, I think it may struggle a bit. From memory I think mine is a 30 amp dual bank charger, which feeds 1x 85Ah battery on the port bank and 2x85Ah on the starboard bank. My old boat had 3x110Ah batteries on the domestic side which were charged as one bank from a charger with higher capacity, but I can't remember what it was! Quote Link to comment Share on other sites More sharing options...
Antares_9 Posted March 24, 2011 Share Posted March 24, 2011 Will it charge them, yes, will it charge them equally and to capacity, no, unless all three are the same capacity and general condition. Part of my battery maintenance system is a split charger which has a separate sensed output to each battery which is perhaps a bit of overkill as the batteries are all the same age and type but if I replace them at differing times or with different types I will be glad i have it. And another thing, get those batteries clamped down with something, if you get caught out in a F8 on Wroxham broad they'll be jumping about all over the place. Quote Link to comment Share on other sites More sharing options...
jimbo Posted March 24, 2011 Share Posted March 24, 2011 Yes, they should have terminal covers on too Biggles. Quote Link to comment Share on other sites More sharing options...
Antares_9 Posted March 24, 2011 Share Posted March 24, 2011 Yeah, and wash behind your ears. Quote Link to comment Share on other sites More sharing options...
diesel falcon Posted March 24, 2011 Share Posted March 24, 2011 AND.....don,t forget to open your sea cock! Quote Link to comment Share on other sites More sharing options...
quo vadis Posted March 24, 2011 Share Posted March 24, 2011 I see your point about strapping them down Quote Link to comment Share on other sites More sharing options...
Palmtree Posted March 24, 2011 Share Posted March 24, 2011 It might also be worth looking at the battery terminal connectors in light of the Boat Safety scheme note to section 3.4.1/R. Ian Quote Link to comment Share on other sites More sharing options...
Hockham Admiral Posted March 25, 2011 Share Posted March 25, 2011 We've got two 12V batteries in series for 24V systems, a 12V Domestic and a 12V Starting battery. As David said, it's not a good idea to try to simultaneously charge different batteries, which in our case would not be possible. The starting and domestic batteries are totally different in characteristics and the 24V needs just that! So we bit the silver and bought 3 marine battery chargers whose leads are bolted (not with the crocodile clips!) directly to the batteries. The "Rolls Royce's" of battery chargers are Ctek, if you can afford them! However I would certainly buy a sealed unit type (similar to the Ctek in design) for permanent installation and screw/bolt it to a bulkhead. Quote Link to comment Share on other sites More sharing options...
diesel falcon Posted March 25, 2011 Share Posted March 25, 2011 http://lh3.googleusercontent.com/public ... u5ZhxKfxi8 these are 96 quids and can be found here http://www.google.co.uk/products/catalo ... EoQ8wIwAg# conect it up turn on and forget! Quote Link to comment Share on other sites More sharing options...
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