Need to replace 2yo T-105s due to my neglect and wondering if 2-12V 24DC in parallel are a wiser less expensive choice since not using MH dry-camping?https://www.walmart.com/ip/EverStart-Lead-Acid-Marine-RV-Battery-Group-24DC/180350522TIA for expert opinions as always

As you are planning to parallel a pair of 12V jars. Your plan will provide far less available power than you had before.I suggest that you start by looking at Sams or Costco for 6V golf cart batteries to replace the T-105s. Then, go and by a good 4 stage converter charger and take good care of these. Matt

If you hook up 2 12V to create a 24V circuit you will blow up everything 12V in your coach. Please DO NOT DO THIS!You certainly could do 2 12V batteries wired in parallel to maintain a 12V output and increase the amp hours. Compare the amp hours of the 2 6V wired in series to the amp hours of your 2 batteries wired in parallel to compare the 2 options.2 6V of 100 amp hours = 100 amp hours at 12V2 12V of 100 amp hours = 200 amp hours at 12V

RV-1/2n-FUN wrote:Need to replace 2yo T-105s due to my neglect and wondering if 2-12V 24DC in parallel are a wiser less expensive choice since not using MH dry-camping?https://www.walmart.com/ip/EverStart-Lead-Acid-Marine-RV-Battery-Group-24DC/180350522TIA for expert opinions as alwaysIf as you say you are not using the MH for dry camping. And if we can assume you are always going to be plugged in to shore power. Then buy the cheapest battery you can. The two 12 volt batteries will work fine for you. Your current T-105's are wired in series to give you 12 volts. If you replace with 12 volt batteries then make sure they are wired in parallel so you still only have 12 volts.

Thanks all.opnspaces wrote:RV-1/2n-FUN wrote:Need to replace 2yo T-105s due to my neglect and wondering if 2-12V 24DC in parallel are a wiser less expensive choice since not using MH dry-camping?https://www.walmart.com/ip/EverStart-Lead-Acid-Marine-RV-Battery-Group-24DC/180350522TIA for expert opinions as alwaysIf as you say you are not using the MH for dry camping. And if we can assume you are always going to be plugged in to shore power. Then buy the cheapest battery you can. The two 12 volt batteries will work fine for you. Your current T-105's are wired in series to give you 12 volts. If you replace with 12 volt batteries then make sure they are wired in parallel so you still only have 12 volts.Yup, the T's are in series as we all know so the 12's have to be parallel and just figure that in the 10 years we have had the MH we have never Dry Camped and due to my prostate cancer are using it even less.

A couple of these will work on/off grid, should you find yourself in a place with no hookups. https://www.samsclub.com/p/marine-27magm-18-mo-free/prod21234614?Not too pricey, and AGMs are set 'em, and forget 'em. Good in hot/cold and maintenance free. Good total amp hour rate, not T105 good, but good for a night or two off shore power. No idea what your charger looks like, so get a good one, if it's an old single stage, and you'll be good to go. Take care of that medical issue first, though. Batteries can wait. Best wishes, and good luck with both.

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Bill_Satellite
Explorer II
Jan 08, 2020
If you hook up 2 12V to create a 24V circuit you will blow up everything 12V in your coach. Please DO NOT DO THIS!
You certainly could do 2 12V batteries wired in parallel to maintain a 12V output and increase the amp hours. Compare the amp hours of the 2 6V wired in series to the amp hours of your 2 batteries wired in parallel to compare the 2 options.
2 6V of 100 amp hours = 100 amp hours at 12V
2 12V of 100 amp hours = 200 amp hours at 12V
Matt_Colie
Explorer II
Jan 08, 2020
As you are planning to parallel a pair of 12V jars.
Your plan will provide far less available power than you had before.
I suggest that you start by looking at Sams or Costco for 6V golf cart batteries to replace the T-105s.
Then, go and by a good 4 stage converter charger and take good care of these.

Matt

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