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Old 04-21-2012, 11:18 AM   #1
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Charging batt while boondocking

We will be boondocking this entire season. I have a honda 1k genny that I plan to use to charge the battery.

Question:
If I plan to use an off-board charger, will I need to disconnect the TT terminals from the battery prior to connecting the off-board charger to the battery?
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Old 04-21-2012, 11:40 AM   #2
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Old 04-21-2012, 04:33 PM   #3
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I don't see where there would be a problem unless the battery is totally dead then I would disconnect first.
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Old 04-21-2012, 06:56 PM   #4
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To add to what Terry has said, by disconnecting the load from the TT first, you would have a faster charge rate (depends on how much TT load is there). If you don't care about the rate then don't bother to disconnect.
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Old 04-21-2012, 08:32 PM   #5
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I should have elaborated on my post as to why I recommended disconnecting if the battery was low. Most battery chargers do not put out clean power - they generally have a rectifier or diode bridge which inverts the negative portion of the AC sine wave. When you charge a good battery, it will act like a big capacitor and smooth out the power. If you throw it on a dead battery you risk throwing bad power into the TT and possible damage to the electronics.

Illustration --

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Old 04-21-2012, 09:23 PM   #6
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We used a similar generator , a Honda 650, and just plugged it into the trailer. We ran a tank a day through the generator, about 1 liter, and we always had power. We did that for right at 13 years with no problems.
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Old 04-21-2012, 10:52 PM   #7
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Terry,
There is a difference between a discharged battery, and a failed battery. A discharged battery will still filter any ripple in the DC voltage.
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Old 04-21-2012, 11:26 PM   #8
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Quote:
Originally Posted by clutch View Post
We used a similar generator , a Honda 650, and just plugged it into the trailer. We ran a tank a day through the generator, about 1 liter, and we always had power. We did that for right at 13 years with no problems.
That was an option I was thinking about, but if I wanted to charge it faster, I would have to use an "off-board" charger, at least that is what I'm thinking. Thank you all for the information, once again, I am able to learn more from this site!
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Old 04-22-2012, 08:45 AM   #9
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Quote:
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Terry,
There is a difference between a discharged battery, and a failed battery. A discharged battery will still filter any ripple in the DC voltage.
I was thinking of a battery where someone left it hooked up and it ran down to nothing. While it would lessen the dirty power but you would still have some ripple for a short time.
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Old 04-22-2012, 10:15 AM   #10
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Quote:
Originally Posted by chopshop View Post
That was an option I was thinking about, but if I wanted to charge it faster, I would have to use an "off-board" charger, at least that is what I'm thinking. Thank you all for the information, once again, I am able to learn more from this site!
If your trailer has a dual battery system you have another option. When you wire batteries parallel to maintain 12v you wire positive to positive, negative to negative and connect the TT to one of the 2 batteries. You have the option of running a positive cable from both batteries individually to the positive cable of the TT and the same with the negative. You can put an inline switch or fuse on each positive and negative cable from both batteries. This way you can isolate one battery from the TT while charging and still have one battery connected to run things. You will just have to charge your batteries separately. This way any concerns you have will be met and you don't have to shut things down while charging. But you would need a dual battery system.

If you are unsure how to do this yourself involve a professional cause wiring this wrong could damage things.
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