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Old 09-16-2016, 06:19 AM   #1
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Adding 2nd house battery

Anyone,

I just purchased a used, 25' Class C that has ONE house battery but appears to have enough room to house a second battery. Question: IF I attempt to wire in a second battery is it possible the inverter would NOT accommodate a second battery? Perhaps the MH ONLY came with one battery for a reason! Responses would be much appreciated!

P.S. I intend to use it at my hunting property that does not have electric hookup.

tks

Chuck K.
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Old 09-16-2016, 06:27 AM   #2
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If you have an inverter it won't care. Your converter will charge one or two batteries. Check yours but both our units had a tray that would hold two batteries whether one or two were installed. That seems to be normal with Ford. On ours the front battery can slide forward a bit so the rear comes out. Put the front in first.
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Old 09-16-2016, 06:33 AM   #3
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Quote:
Originally Posted by nothermark View Post
If you have an inverter it won't care. Your converter will charge one or two batteries. Check yours but both our units had a tray that would hold two batteries whether one or two were installed. That seems to be normal with Ford. On ours the front battery can slide forward a bit so the rear comes out. Put the front in first.
Thanks!

Used MH and came with very little useful info. I will check model/SN on converter and inverter and see if I can ferret out answer to my question. FYI: Unit is on Chevy chassis and additional battery will be next to existing battery and not in front or back.

Thanks again!
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Old 09-16-2016, 07:23 AM   #4
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As long as you wire it correctly, you'll have no issues, your converter and inverter will work normally. I recently installed 2 additional batteries ( 4 total house batteries, 1 chassis battery) I'm loving it!
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Old 09-16-2016, 09:27 AM   #5
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Chuck,

If you plan to parallel an existing 12V battery, you will probably be disappointed. You can do it, but the two will not properly share load and charge. If you have room, go to a pair of golf cart batteries or a single 4D or 8D.

Frank
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Old 09-16-2016, 02:38 PM   #6
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Paralleling batteries is done all of the time.

Even 4, 6 volt batteries are in a series / parallel arrangement.

On the rare occasion that a poorly designed setup does discharge unevenly, a equalizer charge, or even a long duration charge, will bring them back to normal.
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Old 09-16-2016, 02:47 PM   #7
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And if he has a chevy chassis he does not have room for 4D or 8D batteries.
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Old 09-16-2016, 03:01 PM   #8
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Two six volt batteries to replace the one twelve volt would work for you.
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Old 09-16-2016, 03:03 PM   #9
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If you're adding a battery, first, how old if the one you have? If it's several years old, like 4-5, maybe trade it in on a pair of 6v batteries instead. Two 6v batteries have about 20% more current than two 12v batts. Wired correctly, your converter (makes 12v from 120v) won't know the difference.
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Old 09-16-2016, 07:02 PM   #10
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Drop in to The 12volt Side of Life (Part 1) for a lot of info about batteries. Excellent site.
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Old 09-16-2016, 07:45 PM   #11
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Another site loaded with info on batteries is Yandina.com. Check out the FAQ section.
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Old 09-17-2016, 08:11 AM   #12
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I would add a second battery, but I would only do it if they were both new batteries. 6 volt or 12 volt either way. Adding a new with an old is not a great idea in my opinion. 2 6 volt you would wire in series/parallel, 2 12 volt you would wire in parallel. Good luck
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Old 09-17-2016, 09:20 AM   #13
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Here would be my choice if you have room and the $$$

Trojan T1275 Heavy Duty 12v Battery
12V 150Ah Flooded Lead Acid Golf Cart Battery
Length: 12.80, Width: 7.10, Height: 10.80 Inches
These babies are $209 each but for the most usable AH available.

With 300 AH verses 225 of most 6 volt. For a clairify two 6 volt are wired series four or more are wired series/parallel and 12 volt wired parallel with the charge wires run from positive on one to the negative on the last.

LEN
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Old 09-19-2016, 12:37 PM   #14
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Quote:
Originally Posted by F76Marion View Post
Chuck,

If you plan to parallel an existing 12V battery, you will probably be disappointed. You can do it, but the two will not properly share load and charge. If you have room, go to a pair of golf cart batteries or a single 4D or 8D.

Frank
This is where we were when we first bought our used coach. It had a 12v chassis battery of course and a single 12v deep cycle marine battery for the house. I dumped the 12v house battery and purchased (2) 6v golf cart style batteries from Batteries Plus. Wire the pair in series as stated will give you 12v.
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