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Old 03-23-2015, 05:03 PM   #11
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I'm thinking I should be able to do that. But some threads on this forum suggest that on-board convertors aren't quite up to completely topping off true deep-cycle batteries. What kind of battery/batteries do you have, and what methods have you used to measure the depth of discharge and charge?

I'm leaning towards a pair of group 27 deep-cycle (not dual-purpose) 12V batteries. While that's less efficient than 2 6v batteries of similar physical size, it allows me to use 1 as stand-alone if the other should fail.

My first step may be 1 group 24 marine battery to supplement the one that came with the trailer. If I go that route I'll replace that pair with 2 G27 deep cycles when I accrue the necessary funds.

In addition to dry camping, I plan to use the same batteries in my home as a backup source for CPAP. Both my wife and I would need it and the arrangement of my bedroom makes extension cords, or putting a pair of 6V batteries next to each other, impractical. It works better for me to have 1 12v battery on each side of the bed.

I'll use my Honda genny and my Schumaker battery to recharge the batteries under those circumstances. I'll also keep them on a battery tender on the back porch when not in use.
I'd be real leary of (unless there sealed batt.) inside due to over time the fumes ( gases) raise heck with linen. In the befoe dirt days, we used to put batteries in the trunks of our cars to help with traction...worked okay,but upholstry didn't care much for it. I really don't as such have a gauge on my stuff, I just go with the flow or what it tells me it needs.
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Old 03-23-2015, 05:11 PM   #12
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As mentioned above, the 12V supply is of little value. You will get a faster and better charge plugging you RV into the AC side of the generator and letting the convertor do the charging. Go for the companion.
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Old 03-23-2015, 07:38 PM   #13
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As mentioned above, the 12V supply is of little value. You will get a faster and better charge plugging you RV into the AC side of the generator and letting the convertor do the charging.
X2. You're talking about "Good", "better", and "best". As crappy as a stock converter might be, you're still going to get a better charge on with that over your genny.

Not to say that they are completely worthless. If you need a jump start or say... want to lug it down near the lake to pump up some inflatables for the kids it can come in really handy, but personally, I've never used the 12v side of mine.
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Old 03-23-2015, 07:44 PM   #14
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What did you do to disable the 12 volt side of convertor?
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Old 03-23-2015, 08:22 PM   #15
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What did you do to disable the 12 volt side of convertor?
You don't necessarily "disable" it so much as just don't use it.
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Old 03-23-2015, 08:34 PM   #16
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I'm not aware of my Honda having a 12 volt side. NOT wanting to create ill feelings, I think it only produces 120 volt , other wise, the battery couldn't charge.
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Old 03-23-2015, 09:08 PM   #17
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I'd be real leary of (unless there sealed batt.) inside due to over time the fumes ( gases) raise heck with linen.
I'm not concerned. They'll be on the back porch most of the time, and in the bedroom only if power fails.
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Old 03-24-2015, 12:07 AM   #18
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I'm not aware of my Honda having a 12 volt side. NOT wanting to create ill feelings, I think it only produces 120 volt , other wise, the battery couldn't charge.
As seen in the pictures below, the standard model EU2000i (and possibly the 1000 and 3000) definitely has a 12V connection. It's below the 20A receptacles. The companion model does not have 12V. Instead, it has 1-20A receptacle and 1-30A twist-lock receptacle.

The 30A receptacle on the companion produces 30A only when run in tandem with another 2000i, either standard or companion. Running solo, both outlets on the companion are live but, like the standard model, are limited to a combined output of 13.3A sustained and 16.7A peak. Kits are available to allow linking 2 standard models together to produce 30A.

Standard model:


Companion model:
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Old 03-24-2015, 12:47 AM   #19
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Sorry to differ.....but the 12Volt is only for charging if you've purchased their cables ( special connectors) I just went out to check mine.
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Old 03-24-2015, 01:10 AM   #20
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Sorry to differ.....but the 12Volt is only for charging if you've purchased their cables ( special connectors) I just went out to check mine.
That doesn't change the fact that it does have 12 volt output.
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