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Old 06-23-2014, 11:04 AM   #11
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If, for convenience sake, additional charged 12v batteries were carried in a tow vehicle, could they be connected to the trailer via the 7 pin plug and augment the trailers battery bank?
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Old 06-23-2014, 11:06 AM   #12
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Quote:
Originally Posted by J Mac View Post
If, for convenience sake, additional charged 12v batteries were carried in a tow vehicle, could they be connected to the trailer via the 7 pin plug and augment the trailers battery bank?
Connected - yes. Augment - no.

The wiring is too small to carry enough current to be useful.
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Old 06-23-2014, 11:12 AM   #13
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but will it become part of the useful trailer battery bank?
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Old 06-23-2014, 11:14 AM   #14
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My thinking:

If a portable solar panel can charge the trailer batteries through the 7 pin, couldn't pre-charged batteries?
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Old 06-23-2014, 11:31 AM   #15
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Electrically the charged battery will add to the discharged trailer battery, but without a controller involved you definitely risk frying your small gauge 7-pin wiring if the trailer battery was deeply discharged.

Too great an imbalance in charge between the two is going to cause a large current flow - I'd want 8 gauge or better 12V wiring for your approach.

A portable solar panel is a whole lot lighter, too!
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Old 06-23-2014, 11:36 AM   #16
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Thank you tractors and jamman. I was just a thought.
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Old 06-23-2014, 12:00 PM   #17
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I know when you connect 2 different batteries of different capacities and different charges, the weaker one will cause a discharge from the stronger one in an attempt to equalize. Not good.
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Old 06-23-2014, 12:57 PM   #18
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Thanks cpa
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