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The Norfolk Broads Forum / Broads Boat Owners Q & A / Battery charging
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Posted By Discussion Topic: Battery charging

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L'sBelles
Dec-03-2021 @ 4:59 PM                           Permalink
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Charger manufacturer is really down to personal preference. You cannot go far wrong with one of the reputable brands already mentioned.
As for capacity, whatever you have is never enough long term so buy the largest capacity you are prepared to afford at this moment in order to give you some future proofing.
When you compare different chargers make sure you are comparing like with like. For example, a 20 A charger can supply 20 A but how does it split that when charging different banks of batteries simultaneously? Your starter battery will not get much use presumably so that one will be fine on a trickle charge of a couple of amps while your 330 Ah domestic bank shall require most of the charger capacity a lot of the time.
Another useful feature is to have the different channels independently selectable for battery type. Unfortunately my charger has all of the battery types available but all 3 outputs have to be set for the same battery type. A bit of a pain as it means I have to have an AGM battery as my starter when it is not necessary. In retrospect, a bit more research in advance of parting with cash may have been useful but I cannot resist a bargain priced new and unused charger on a well known online auction site!  Smile
As a final note, I have a 50 A charger with 3 outputs for a 110 Ah starter battery and a bank of two 110 Ah domestic batteries which seems adequate but then it is rare for us to spend more than one night in one place so running the engine helps and the charger is clever enough not to split the capacity equally but directs what it can to the appropriate battery bank.



This message was edited by L'sBelles on Dec-3-21 @ 5:02 PM

pirate
Dec-21-2021 @ 12:45 PM                           Permalink
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Hi Thanks for all feedback, I will want to use 2 feeds from the unit, 1 domestic and 1 engine but the common unit has 3 feeds. What do people do with the third ? not use it or link it to one one of the others.

Happy Xmas

Andy

annville
Dec-21-2021 @ 1:22 PM                           Permalink
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Hi Andy just leave it disconnected, just make sure that the bare terminals are protected and nuts lightly tightened,lightly smear all terminals with vaseline to stop corrosion. if you join them together the unit will not work correctly, Do you not have the instruction manual?. John

L'sBelles
Dec-21-2021 @ 6:11 PM                           Permalink
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As John says you should not connect the outputs together otherwise as a minimum you shall lose the "intelligence" of the charger and at worst you might actually damage it.
Just leave spare outputs unconnected if you have no immediate use for them.

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