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can anyone tell me if i can use an 85 amp & a 110 amp together & would i need tto modify the charging system thnks
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how ever the self discharge of the duff battery will affect the other two as they try to equalise the voltage and hence the two good batteries whilst capeable of holding a full charge will not in most cases ever get there.if one battery is faulty or old it will then impact on the total capacity...it wont take/hold a full charge but the two good ones will still be fully charged but will show an overall reduced capacity due to the duff battery..
think we need to agree to disagree Roger.how ever the self discharge of the duff battery will affect the other two as they try to equalise the voltage and hence the two good batteries whilst capeable of holding a full charge will not in most cases ever get there.
Hence the advice to always buy a matched pair rather than adding a second battery to an existing one of unknown age or condition.
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It will be fine, don't fret, do it, your charging system will cope.:thumb:
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Taken from a previous post by me...
Quote:
Originally Posted by loubsterlouise
Well for a start I was led to believe that batteries only charged to the lesser or weaker one so why connect all 3 if 2 have larger capacities.I wouldn't know where 2get bits from or what bits required.Finally not very confident with electrics and with 2small kids wouldn't want to get it wrong.
then you were lead to believe wrongly.....a myth.
you can connect any sized battery to any other sized battery without problem.
the only time it really matters is if one battery is beyond help.....or is a different type...gel, AGM etc.
a simple example.
take a sink basin, a washing up bowl and a large jug.
basin = 125ah battery, bowl = 100ah battery and jug = 75ah battery.
now stand the jug in the bowl and the bowl in the sink and start to fill the jug.
[HI]once the jug is full the water will overflow into the bowl and in turn the bowl will overflow [/HI][HI][HI]into the sink.[/HI][/HI]
[HI]all three are now full.[/HI]
same applies to batteries.
once the 75ah is full it wont take any more charge but the charger will continue to charge the 100ah until that is full, then it will continue to charge the 125ah until that too is full.
you will then have one large battery of 200ah capacity.
the charger doesn't 'see' 3 batteries...only one 200ah battery.
if one battery is faulty or old it will then impact on the total capacity...it wont take/hold a full charge but the two good ones will still be fully charged but will show an overall reduced capacity due to the duff battery..
Hi Big al 1
This subject of charging 2 batteries from a single source crops up regularly and many knowledgeable replies have been posted, fortunately there is a simple non technical solution to the problem - purchase ,as I did, a 2 ACCUMULATOR CHARGER from www.kemo-electronica.eu . Their part number is M102N. If I remember correctly the unit costs about £15 and works well. I have 3 different capacity batteries which I recharge as required from output 2 whilst leaving my 90Ah leisure battery permanently connected to output 1.
Connecting up the unit is straight forward as full instruction are supplied.
The basic connection set up is source eg solar panel - panel regulator - M102N input - output 1 to one battery, output 2 to your other battery. You will only need to make up suitable connecting leads and site the unit which measures approx W84 H58 D33 mm.Don't forget in line fusing. Full instruction and cct diag are supplied. Delivery was quick.
I don't have any connection with this company - just a satisfied user.:thumb:
Hope this helps.
Brian
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think we need to agree to disagree Roger.
i take your point when the bank is off charge, but not when being charged...the good batteries will still accept a full charge but will then be dragged down by the bad battery once off charge..
quote....but will show an overall reduced capacity due to the duff battery..
It will be fine, don't fret, do it, your charging system will cope.:thumb: