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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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dannyb1
Oct-20-2010 @ 12:04 PM                           Permalink
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Does anybody know if it is possible to charge two 12 volt batteries linked together as a 24 volt battery with a twin output 12volt battery charger, ie each output of the charger connected to one battery each whilst the hole thing is still running as a 24volt battery??  

Cheers
Danny

This message was edited by dannyb1 on Oct-20-10 @ 1:19 PM

kfurbank
Oct-20-2010 @ 1:37 PM                           Permalink
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Mardles sometimes
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Hi Danny,

Not possible I'm afraid. The two neutrals from the outputs of the charger will be linked together within the charger, therefore whilst you could charge the first battery no problem, the moment you go to attach the second neutral to the negative of the second battery, at the midpoint voltage, you would short it to earth. The only way to recharge is with a 24V alternator, 24V charger or a 12V to 24V step up charger if you want to charge the whole lot of a 12V source.

Something like this http://www.the12voltshop.co.uk/Shop/battery-to-battery-charger-24v-to-12v-25a.html

Keith

dannyb1
Oct-20-2010 @ 6:10 PM                           Permalink
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thanks for that keith, I am ok charging the 24v off an alternator but I have a 240volt 12volt charger for my 12volt bank with a spare output just wondered if I could use it somehow before I go out and buy a 24v battery charger for the 24v bank in the interests of plugging everything in to 240v and staying quiet!

Thanks for the advice
Cheers
Danny

george
Oct-21-2010 @ 6:29 PM                           Permalink
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you could i suppose fit a charger 12v with two outlets and charge each battery as individuals. you would have to add a breaker switch to disconnect the batteries while charging. this would kill the option of using power out of them at the same time. at the end of the day a waste of time i would think.

george

dannyb1
Oct-21-2010 @ 8:29 PM                           Permalink
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Sterling sell a charger called Pro Sport, there is a 20amp dual outlet to do 2 seperate 12 batteries at 20amp or I think you can connect up the same way to 2 12v batteries as a 24v and keep them running whilst charging at 10amp?  Could be wrong, I suppose I could also just buy a standard single output 24volt charger but where would you put the terminals as the 2 12volr batteries are linked positive to minus....

This message was edited by dannyb1 on Oct-21-10 @ 8:30 PM

dannyb1
Oct-21-2010 @ 8:39 PM                           Permalink
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checked it out, only two terminals will be linked plus to minus, the other two terminals are open and will be where you get the 24v from thus where the charger is connected and there will be 12volt passing over the linked terminals. Google is a wonderful thing

kfurbank
Oct-21-2010 @ 8:48 PM                           Permalink
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With regard to George's suggestion, I would strongly suggest against this, as the first time you forget to isolate the two batteries before charging, will be the last time you use that charger.

Dannyb1, with regards to the Sterling charger, I'm not sure if it can be used as you suggested. It would be highly unusual. I would suggest a purpose built 24V charger. You would conect the negative to the negative on battery number one. This batteries negative should also be connected to the negative running around the boat and to any other 12V batteries negative being used to supply 12V, NOT 24V. The positive would then be connected to the positive of battery number two. This is the point that should measure 24V+ if measured with a multimeter. The positive of battery number one should be directly connected to the negative of battery number two, by the shortest, thickest cable you can manage, with no other connections to either of these terminals. IMPORTANT, the negative of battery number two, should never be connected to any other negative, or the negative running around the boat.

Keith

dannyb1
Oct-21-2010 @ 8:54 PM                           Permalink
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Thanks for that keith, will be going for a 24volt charger I think,  This Sterling Pro Sport has 2 outputs with a positive and negative supply for each of the two outputs and probably a clever bit of kit inside the unit that works out its a 24volt battery and makes changes accordingly, that is unless I have misread the instructions but I am pretty sure thats what it said, I am also a bit dubious incase it ever went wrong.

Cheers
Danny

gallopinhairpin
Oct-24-2010 @ 10:59 AM                           Permalink
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Why not just buy an additional 12V charger and use one on each battery with the batteries still connected. I have a Gunsons automatic charger that I have just checked with a meter and found the outputs are floating. As long as at least one of the chargers has floating outputs you would be ok.

Regards,
Mike.


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