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04-25-2021, 03:54 AM #1
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One 12 volt AGM battery, double AMP hour capacity?
Hello. I have one 12 volt AGM 85 amp hour battery. I want double my amp hours. How do do that? Buy another one and connect them in series or parallel?
2021 Imagine 3250BH
2021 GMC Sierra 2500HD
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04-25-2021, 06:25 AM #2
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Parallel. + to + and - to -
2019 F-250 Supercab
2017 Imagine 2650RK
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04-25-2021, 07:35 AM #3
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I hope the battery is relatively new. It's not good to mix an old battery with a new one.
RedLocation - Wherever the road takes us...Full-timers
2015 Momentum 380
2019 Ram Dually
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04-27-2021, 05:16 AM #4
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Thank you for the advice.
2021 Imagine 3250BH
2021 GMC Sierra 2500HD
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04-27-2021, 05:49 AM #5
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In a nutshell.....Hooking batteries up in series, double the voltage of the batteries, but retains the amp hours....assuming that both batteries are the same. Hooking up batteries in parallel keeps the voltage the same, but doubles the Amp hours, and again, assuming that both batteries are the same.
2016 F350 CrewCab Dually
2018 Momentum 394M...Heavily Modded!
2023 Suzuki GSX-S1000 GT+
Excessive Payload is a Wonderful Thing
"If it ain't fast....It ain't Fun"
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04-27-2021, 08:37 PM #6
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04-28-2021, 12:26 AM #7
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04-28-2021, 12:35 AM #8
85 ah battery means 43 usable as it’s not good to draw below 50%. 43 amps is minuscule in terms of RV amp hours. Even by doubling you only have 86. Better getting 2. -6 volt golf cart batteries in the same space and wiring in series. Usually means 240 amp hours at 12 volts or 120 usable in the same space as your undersized group 24 batteries.
Donna and Dave
Annapolis, Maryland
2021 Grand Design Imagine 2500RL / Dodge Ram Longhorn 2500 6.4 Hemi
350 W Newapower Solar: 3000 Victron Inverter/ Charger: Firefly Oasis carbon foam AGM
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04-28-2021, 05:47 AM #9
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Freezer Opens on Travel Day?
Today, 03:46 PM in Appliances