Mowjo Posted August 20, 2009 Share Posted August 20, 2009 I need to change the Alternator on my boat, because the one on it is the first type that Thornycroft fitted when they phased out dynamo's, the guy at Thornycroft recommends fitting a 36Amp one as that what the pulley system was designed to take, and he's says it's more than man enough for two 110Amp battery's, but all the sites I've checked say that it should have more Amps, one even says you need a 50Amp one just to charge a 85Amp battery, anyone have any input on this, or know where I can find more info,, Regards Frank,, Quote Link to comment Share on other sites More sharing options...
jimbo Posted August 20, 2009 Share Posted August 20, 2009 36 Amp does sound rather small? The one fitted to my Nanni engine is a 60 Amp and that charges 3 110ah batteries. Quote Link to comment Share on other sites More sharing options...
Mowjo Posted August 20, 2009 Author Share Posted August 20, 2009 I thought that Jimbo! I may go for the larger one because I want to try and fit a third battery, so I have one for starting and two domestic, the new boat has an Engel fridge, so what with the little telly and lights I don't think one 110amp battery will be enough,, Regards Frank,,, Quote Link to comment Share on other sites More sharing options...
Antares_9 Posted August 20, 2009 Share Posted August 20, 2009 It will depend on how much you run obviously, but 36a does seem ather small, however if you fit a good regulater and splitter system it will at least ensure that it is giving it's full 36a and is distributed where it's needed. Quote Link to comment Share on other sites More sharing options...
Guest Posted August 24, 2009 Share Posted August 24, 2009 Hi Mowjo Ideally your alternator (and charger) should be 20% of the total power of your batteries any more could boil leisure batteries. If you are grouping batteries together in parallel always match the amp/hour values. Jonathan Quote Link to comment Share on other sites More sharing options...
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