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Jeepinator 
Groupie 
Joined: 08 Sep 2017 Location: Seacoast NH Online Status: Offline Posts: 72 |
 Topic: Charge RPod Batteries with TVPosted: 22 Sep 2019 at 9:02pm |
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After a reasonable amount of research I believe that charging with the TV alternator could potentially deliver 27 amps if I use a 10 gauge wire from TV battery (after isolator) to RPod.
Assumptions as follows: Voltage drop across the wire will be V=I/R. V is Voltage I is current - which would be the charging current from the truck R is resistance 10ga is .9989 ohms/1000ft 1/((36*0.9989)/1000) = 27.80 amps 1 Volt (13.5 - 12.5) 36 Feet. (TV to camper and back to TV) The alternative would be a 12v to 12v charger perhaps but other than a potentially higher charge rate I’m not sure it’s worth the money. Thoughts? |
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2018 Jeep Wrangler Willys
2017 179 |
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seafans
Senior Member 
Joined: 24 Nov 2017 Online Status: Offline Posts: 155 |
Posted: 22 Sep 2019 at 10:38pm |
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Check the output of the alternator. The jeep should have about a 160 Amp alternator if it has the tow package and aftermarket alternators with more output go up from there. When I wired my SUV for power to the trailer E-trailer suggested using an automatic reset 30 amp circuit breaker parallel in the wire, and a 10 amp for the brakes.
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offgrid
Senior Member
Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 23 Sep 2019 at 4:49am |
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1V drop is about right for the conditions you describe. But 1V is a lot on a 12V system. You'll likely never push that much current because the voltage will drop at the TV battery due to the load on the alternator (the alt ratings are at high rpm, not idle), so you'll wind up down around 12V or less at the trailer battery. That's why we don't trip our 30A trailer charge circuit c/b's when we run 10 AWG wire to the trailer connector. Maybe if you started with a fully charged TV battery, a fully discharged trailer battery, and immediately drove off so that your alternator was putting out its full current.
Please DO install that 30A breaker btw, the closer to the battery the better. i
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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seafans
Senior Member
Joined: 24 Nov 2017 Online Status: Offline Posts: 155 |
Posted: 23 Sep 2019 at 10:14pm |
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Jeepinator
36 feet seems like a long
distance for the #10 gauge wire? From the battery to the 7-prong connector
equals how may feet? The ground wire only requires to go from the 7-prong
connector to the closes bolt or heavy screw on the TV. I found a good amp/wire chart. Hope this works: http://www.offroaders.com/technical/12-volt-wiring-tech-gauge-to-amps/ |
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Jeepinator
Groupie
Joined: 08 Sep 2017 Location: Seacoast NH Online Status: Offline Posts: 72 |
Posted: 24 Sep 2019 at 7:10am |
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Seafans,
36’ was a round trip to the TV battery. Thanks for the info!
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2018 Jeep Wrangler Willys
2017 179 |
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Charge RPod Batteries with TV