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Open Roads Forum  >  Truck Campers

 > How to calculate the amp hour of a dual baterry setup

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Fhotoman

Maple Ridge, BC, Canada

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Posted: 01/06/10 04:56pm Link  |  Print  |  Notify Moderator

I am trying to decide on some new batteries for my TC and I have been given conflicting info from different people. Maybe someone here can help.

If I run 2 6V 100ah batteries in series to get 12 volts, how many ah do I have in total?

Same question if I am running 2 12V 100ah batteries in parallel, how many total ah do I have?


Bill

2009 GMC Sierra 2500HD Crew Cab, 6.5ft Box, 2000 Adventurer 80W, 464ah, Iota DLS-45 Converter with IQ4, Xantrex 600W Inverter, Trimetric 2025, Torklift, Fastguns, Super Springs.

sukrfish

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Posted: 01/06/10 05:05pm Link  |  Print  |  Notify Moderator

Fhotoman wrote:

I am trying to decide on some new batteries for my TC and I have been given conflicting info from different people. Maybe someone here can help.

If I run 2 6V 100ah batteries in series to get 12 volts, how many ah do I have in total?

Same question if I am running 2 12V 100ah batteries in parallel, how many total ah do I have?


In Parallel ( + to +, - to -) the capacity becomes the sum of the individual battery capacity...so for your example:

2 12v 100 amp hour batteries will give you a total capacity of 200ah combined.

In Series, your increasing the voltage (the sum of the voltages) and the capacity doesn't change. So for your example:

2 6v 100 amp hour batteries will give you a total capacity of 100 amp hours at 12v in series.


Edit: By the way, you can always try this out with a couple of small batteries and a voltmeter! [emoticon] You won't get conflicting information that way [emoticon]

Dan

narcodog

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Posted: 01/06/10 05:06pm Link  |  Print  |  Notify Moderator

Just multiply by two. If the six volts 240 than you have 480. You might want to Google the 12 volt side of life.

time2roll

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Posted: 01/06/10 05:08pm Link  |  Print  |  Notify Moderator

Series you add voltage, parallel you add amp-hours.


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Posted: 01/06/10 07:49pm Link  |  Print  |  Notify Moderator

My 6 volt Interstate U2200's have 232 amp/hrs each, and/or with two connected in series for 12 volts. Lots of bang for the buck.

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trail-explorer

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Posted: 01/06/10 05:09pm Link  |  Print  |  Notify Moderator

narcodog wrote:

Just multiply by two. If the six volts 240 than you have 480. You might want to Google the 12 volt side of life.


incorrect. read previous post.

with 6v batts, voltage doubles, amp hours stays the same.


Bob

rrupert

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Posted: 01/06/10 05:14pm Link  |  Print  |  Notify Moderator

I agree with Trail-explorer.


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pianotuna

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Posted: 01/06/10 05:14pm Link  |  Print  |  Notify Moderator

Hi Fhotoman,

Amps in series connections do not add, but the voltage does add.

6 V @ 100 amps (series) 6 V @ 100 amps = 12 volts @ 100 amps

Amps in parallel connections do add, but the volts do not add.

12 v @ 100 amps (parallel) 12 V @ 100 amps = 12 V @ 200 amps

For my further thoughts on power solutions for RV's surf here:

Technology

Start with "Battery Selection"

Fhotoman wrote:

I am trying to decide on some new batteries for my TC and I have been given conflicting info from different people. Maybe someone here can help.

If I run 2 6V 100ah batteries in series to get 12 volts, how many ah do I have in total?

Same question if I am running 2 12V 100ah batteries in parallel, how many total ah do I have?



Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

sh410

Northwest

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Posted: 01/06/10 05:26pm Link  |  Print  |  Notify Moderator

Further, many popular 6v Batteries have 200+ amp hours, therefore two 6v batteries would give you 200+ amp hours. Many popular 12v batteries have 100+ amp hours, therefore two 12v would give you 200+ amp hours. For example the golf cart 6v batteries from costco, walmart are rated at about 210 amp hours and Don says he can get 12V batteries at walmart rated at 125 amp hours but I have not seen them. Most commonly you will see 12v batteries rated at about 115 amp hours





Fhotoman

Maple Ridge, BC, Canada

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Posted: 01/06/10 05:34pm Link  |  Print  |  Notify Moderator

Ok Thanks. That is what I thought.

With that being the case, why would people choose to run 2 6v batteries over 2 12 volt batteries?

I am considering 2 Trojan T-1275's. 12V 150ah x 2 gives my 300ah and redundancy if one fails.

OR 2 Trojab T-105's @ 6v 225ah x 2 in series gives me 220ah.

Why would I choose the 2 6v batteries?

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