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Old 08-22-2015, 01:45 PM   #11
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I am totally lost with wiring a 2nd battery. Wish I could do it myself, doesn't seem like it should be so hard. I need to attach another battery box, and find out what battery is in the first one, to get another the same....? It's the connections that are "Greek" to me. I will try anything if I'm sure it's safe.


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Old 08-22-2015, 05:22 PM   #12
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I am totally lost with wiring a 2nd battery. Wish I could do it myself, doesn't seem like it should be so hard. I need to attach another battery box, and find out what battery is in the first one, to get another the same....? It's the connections that are "Greek" to me. I will try anything if I'm sure it's safe.


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Go and read the website "the 12v Side of Life I and II".
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Old 08-22-2015, 05:55 PM   #13
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When you get a second 12v battery, connect the +(pos) from the original battery to the +(pos) of the new battery and the -(neg) of the original battery to the -(neg) of the new battery.
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Old 08-24-2015, 10:39 AM   #14
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And that's it? The 2 batteries will discharge at the same time together? The second will feed into the first one's connection to the trailer? I think I can do that! Even Home Depot can tell me what to buy! Just not the battery, I will call the dealer, not sure I can lift the one I have out of the box.


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Old 08-24-2015, 11:10 AM   #15
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Yup, you hook the two 12v batteries in parallel and you are good to go.
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Old 08-24-2015, 11:11 AM   #16
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Here's what you can do to supply power to your RV for a long long long time or forever until the batteries are dead or worn out.
Here's my battery bank.

3/12volt AGM 435ah battery bank. The 8 gauge smaller black and red wires are from my 520 watts of solar panels Morningstar MPPT 60 amp charge controller system charging the battery bank. The 2 light blue wires feed over to the Cummins Onan Generator to start it, and the big ones 2/0 gauge feeding the 300 amp fuse feed to my 2000 watt inverter/transfer switch to supply my microwave, coffee maker, 3 flat screen TV's, and anything else on my RV that needs 120v. The 2 2gauge medium size red and black wires feed the 12volts to the 12 volt side of my 5er.

Hope this gives you an idea how easy you can supply unlimited power to your rig. Money and weight of the system will be your only limitations.
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Old 08-24-2015, 04:25 PM   #17
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I can only say WOW! Are batteries for Solar better? I see solar on the battery covers.


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Old 08-24-2015, 04:57 PM   #18
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IMHO, batteries are no place to skimp. I wouldn't leave home with any RV without at least 2 group 31 batteries [115 amp hours each]. Eventually you WILL regret going smaller.
I also have 6 x 100 watt solar panels and 500 amp hrs of DEEP CYCLE batteries with a 5,000 watt inverter and 50 amp auto transfer switch. I started out with a 100 watt panel, 2 group 24 batteries [85 amp hour and NOT deep cycle] and things got out of hand. Now I can't imagine doing without virtually unlimited 12 VDC and 110 when I need it for microwave, TVs [3] Blueray, computers and A/C in a pinch. Rest stops are a lot more comfortable now AND we don't worry about CGs losing power anymore. Been there, done that!
I'm sure this is overkill for most, but there are many levels you can apply without breaking the bank. A 100 watt panel and a 20 amp MPPT controller will cost you about $250. One GOOD group 31 battery will cost about $125 or more. If you don't have GOOD BATTERIES, no system, converter or solar will do you any good. They are the foundation of the entire system.
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Old 08-24-2015, 05:02 PM   #19
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I can only say WOW! Are batteries for Solar better? I see solar on the battery covers.


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The answer is YES, they are much better.
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Old 08-29-2015, 07:56 PM   #20
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If you want extra power, and are concerned about using two batteries, consider two IDENTICAL 6 volt batteries in series. Being identical and in series, they will see the same charging and discharging current for most of their useful life. One will eventually deteriorate before the other, but by that time you'd be looking at new batteries anyway. And being in series, you don't need to be concerned with them interacting or discharging each other. Beyond that, follow all the advice about deep cycle not cranking batteries etc. And most often you get what you pay for, premium performance usually comes at a premium price.
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