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Old 09-10-2012, 05:46 PM   #11
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Re: Charging spare battery

I have successfully charged lots of batteries in trailers while hooked to the tow vehicle. In fact, doing most of the camping I have done with a trailer in the past, I have had little opportunity to hook up to 120V to run the converter for charging, and have had to rely on this charge while driving to top the battery up. The charge rate will only be improved with a larger gauge wire from the vehicle alternator, and I always used a 10g wire for the charge wire.

Basically, as long as there is a higher voltage on the wire leading to the battery than the battery itself has, it will take a charge until these two voltages equalize.
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Old 09-10-2012, 06:06 PM   #12
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Re: Charging spare battery

As long as the battery is not fully discharged the 10 guage charge wire will top up and maintain a full charge very well this is provided the connections in the circuit are in good condition, one area most people don't ever think about is the connections on the back side of the trailer 7 pin connector, the after market generic type are not weather sealed and generaly corrode very quickly causing a large voltage drop across the circuits. The factory ones with a weather pac style connector can still corrode causing the same problem. The other proble most neglect to realize is that the ground is more important than the power circuit and the ground side of the circuit needs to be at et least as big as the power side, It is after all a loop, what goes in must be able to go out.
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Old 09-10-2012, 06:28 PM   #13
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Re: Charging spare battery

Interesting discussions.
I've got 10g red and black wires to run to the battery (about a 5 ft run) and intend to bolt (wingnut) the connections in place on the battery to ensure they don't come adrift.

As to the plug, I plan on wiring the 12v and ground wires in place and then sealing the open end of the plug with "liquid electrical tape" followed, once that has dried, with Goop sealant. That should both prevent corrosion to that part of the plug and waterproof the connections.

Dave
(thinking of changing my signature to ("if it ain't over-engineered, it's no fun")
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Old 09-10-2012, 08:57 PM   #14
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Re: Charging spare battery

A good friend of mine has a saying that i like " Anything worth doing is worth overdoing!! " I truly like it and borrow it.
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Old 09-10-2012, 09:29 PM   #15
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Re: Charging spare battery

You guys probably did some of the home renos on the places we go and work at. In a few cases things are scary underbuilt, but in the majority of cases things are excessively overbuilt. 20 nails in a board where 2-3 would suffice, doubled up studs where not needed, etc. Though Momma used to always say "Better safe, than sorry".
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Old 09-10-2012, 09:53 PM   #16
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Re: Charging spare battery

My take on all this is that my Honda 1000 generator weighs half what a 12V battery weighs. It's available on demand and although I have to carry gas for it, I am comforted that, if my tow runs out of gas, I have a spare five liters. ( although, I must admit, last time I went to fuel the generator, the gas can was empty ).

I can charge the battery direct from the generator, but lazy as I am, I've just plug into the AC and charge through the trailer. I will admit it's not as quiet as a spare battery...

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Old 09-11-2012, 08:01 AM   #17
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Re: Charging spare battery

To be honest I have a honda 2000 aswell. The original justification for it was that with it it takes the risk of running out of power and being cold with out a furnace. This senario only happened once a long time ago but it wasn't much fun with a child in the trailer. The good quality ones like honda and yamaha are very quiet when just running to charge the batteries. Our set up with dual 6v and solar panels and then the generator for back up works very well for us but just having a spare battery would certainly be less expensive
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Old 09-11-2012, 08:19 AM   #18
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Re: Charging spare battery

Guilty as charged, Jim. As I said on another forum, "after taking about 8 total hours to install our new dishwasher, 'at least I know its done right'" No one will ever see the careful routing I used for the supply and discharge lines, but I know that somewhere behind that mundane dishwasher lurks plumbing art.

I'm not guilty of using 20 nails where 3 would do, but I am guilty of using screws more often than nails when building things.

This house has been our home for 20+ years and I've often referred to it as a "hobby house" (like I don't have a few other hobbies as well). Whoever buys this house will get a lot of quality work lying under the multiple coats of paint. In fact, I claim we've painted so many times here that we're beginning to lose floor space as a result.

Dave
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