A/H for batteries in series
Submitted: Saturday, Dec 10, 2011 at 08:24
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Member - Greg N (QLD)
I have arranged 2 x 180 A/H batteries in series to run my 12V appliances. Do I still have 180 A/H @ 12V or just 90?
Thanks
Reply By: Member - GeeTee (NT) - Saturday, Dec 10, 2011 at 08:29
Saturday, Dec 10, 2011 at 08:29
Hi there,
If your batteries are 12 volt and you have them in series you will have 24 volts at 180 A/H.
If you run them in parallel you will have 12 volts at 360 A/H.
That is in theory !!!
AnswerID:
472120
Reply By: Ray - Saturday, Dec 10, 2011 at 09:04
Saturday, Dec 10, 2011 at 09:04
To clarify matters. Series is + to - = voltage X 2 Parallel is + to + is amps X 2
If you connect 2 12volt batteries in series you will blow up your equipment.
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472126
Follow Up By: Member - Greg N (QLD) - Saturday, Dec 10, 2011 at 09:10
Saturday, Dec 10, 2011 at 09:10
My apologies - I should have previewed my post better. I have arranged 2 x 6V 180A/H batteries in series to run my 12V appliances. I take it then, that I have 180 A/H at 12V.
Thanks
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Follow Up By: Notso - Saturday, Dec 10, 2011 at 10:04
Saturday, Dec 10, 2011 at 10:04
That's correct.
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Reply By: ABR - SIDEWINDER - Saturday, Dec 10, 2011 at 10:30
Saturday, Dec 10, 2011 at 10:30
Hi Greg
This may help:
Ser-or-par
Regards
Derek from ABR
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472131
Reply By: LeighW - Saturday, Dec 10, 2011 at 14:26
Saturday, Dec 10, 2011 at 14:26
Yes 180A
Cheers
Leighw
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Follow Up By: LeighW - Saturday, Dec 10, 2011 at 14:36
Saturday, Dec 10, 2011 at 14:36
To be precise,
Batteries in series, add the voltages, AH stay the same.
ie if you put a 6V 100AH battery in series with a 6V 50AH battery (you wouldn't normally for clarity only) AH rating would be 50A. Normally you use the same battery types, two 100AH therefore AH would be 100A
In parallel, voltage stays the same add AH. ie a 12V 50AH & a 12V 100AH would give 12V at 150AH
Cheers
LeighW
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Follow Up By: LeighW - Saturday, Dec 10, 2011 at 14:39
Saturday, Dec 10, 2011 at 14:39
To clarify yet again (I'm doing
well) with batteries in series AH will be that of the battery with the lowest AH rating.
Hope this all makes sense.
Cheers
LeighW
FollowupID:
746932
Follow Up By: Smudger - Sunday, Dec 11, 2011 at 11:57
Sunday, Dec 11, 2011 at 11:57
Another aspect to consider.
I've just installed a second 12v battery paralleled with the existing in our caravan.
The battery supplier tipped me to connect the appliances between the two batteries.
IE: Positive take off from battery #1 and Negative take off from battery #2.
That way both batteries are draining equally. If take off is from one battery only it will be working harder than it's mate.
Sounds like good science to me.
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