On Tue, 1 Apr 2008 15:20:23 +0100, "Tony Brooks"
<Tony@[EMAIL PROTECTED]
> wrote:
>2 x 110 amp hour batteries plus one 85 amp hour battery is just one big
305
>amp hour battery as long as you connect positive to positive and negative
to
>negative. Try connecting positive to negative and I think it will be
smoky
>and expensive ;-)
>
>Voltdrop on charging circuits is a problem so the various batteries in a
>bank are usually connected by starter cable. however in this case the
>distances are greater than normal in marine use. Ideally connect the
>positive charging cable (the one from the relay ) the closest battery
>positive (probably already is) and then take the negative cable off that
>battery, extend it and connect it to the negative of the furthest
battery.
So you mean battery A neg to batt C neg and batt C neg to Batt D neg.
Is that right?
Batt A Pos to Batt B pos to Batt C pos?
>Then when you make all the pos to pos & neg to neg link cable the circuit
>will be complete. This ensures the voltdrop to each battery is as close
to
>the same as possible so all batteries get a similar charge. If you just
ran
>the pos & neg from the existing battery and linked to the others in turn
the
>one at the end of the links would never be a swell charged as the
original
>one.
>
>I know starter or welding cable would cost a bit for this project, but
>thicker really is better as semi-charged batteries sulphate and destroy
>themselves.
>
>Tony Brooks
>
>www.TB-Training.co.uk
>Sup****t & training for ordinary boaters
>"Darren B" <darrenb@[EMAIL PROTECTED]
> wrote in message
>news:mcp3v3p1v5am44r475vmdbp9bqrphc9kjm@[EMAIL PROTECTED]
>> On Mon, 31 Mar 2008 10:41:22 +0100, "Tony Brooks"
>> <Tony@[EMAIL PROTECTED]
> wrote:
>>
>>>Darren
>>>
>>>Look on my website in the electrical notes. The split charge relay
section
>>>should tell you all you need to know and come back if you want anything
>>>clarified.
>>
>> Sorry Tim looks like I need it all clarified.
>>
>> Van has a starter battery and an 85amp leisure battery which both
>> charge when the van is running, however if I flatten the leisure
>> battery it doesn't flatten the starter battery so I presume it has a
>> relay already.
>>
>> I have changed my idea slightly in that I'd now like to add 2x110amp
>> batteries to the system so that they are also charged when running (I
>> think I have a 70amp alternator). This setup I presume is fine and as
>> it already has a mains charging circuit built in that also would be
>> fine?
>>
>> I presume I would just extend the cable from the existing leisure
>> batteries to the additional 2x110?
>>
>> Would it be ok in principal?
>>
>> What about cable? I did hear the bigger the cable the quicker it would
>> charge, bit like water through a straw or a tap principle! So what
>> size cable for the UK?
>>
>> Anything I have missed?
>>
>> Thanks.
>>
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