Which charger?

Canal Boat - - Ask The Experts -

QI am look­ing to buy a three-stage bat­tery charger for my 3 x 120 Ah do­mes­tic deep cy­cle bat­ter­ies. Can you ad­vise the cor­rect size? I am think­ing of 10%, so around about a 40A charger.

MOONFLEET1, from the CB web­site

ATONY REPLIES… It rather de­pends upon what you in­tend to do with it. If you are go­ing to run it 24/7 on a shore­line then a much smaller one (say 10 amps) might be per­fectly ad­e­quate and be kinder to the bat­ter­ies. If you also want it to cover the de­mands of mains equip­ment then you might need a much larger one sim­ply to en­sure the in­verter draws from the charger rather than from the bat­ter­ies. If this is to run from a gen­er­a­tor, you might need a higher out­put one to min­imise the charge time, but for most of the time it would be de­liv­er­ing far less than its rated out­put.

When we were in Liver­pool a cou­ple of years ago, I used an 8-amp charger and it more than kept 3 x 110 Ah bat­ter­ies charged on a sim­ple 12-volt boat. A 40-amp charger will do the job but you might be spend­ing more than you need to.

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