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Open Roads Forum  >  Folding Trailers

 > Rv Battery jump start question

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Terapin

Tampa

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Posted: 11/13/08 11:10am Link  |  Print  |  Notify Moderator

Hello All,
I tried this once. My car battery was dying one morning and would not engage the starter. I thought of calling a tow truck. I then realized I had a Rv battery. So I ran my jumper cables from my RV battery to my car battery. Had just enough juice to run the starter and start the car. Drove to a auto parts store and replaced my car battery.
I am going camping this weekend and wanted to know if I can do the reverse. Lets say I run down my RV battery. Can I use jumper cables from my car battery to my RV battery, Keep my car engine on so I dont drain my car battery, and run electric stuff in my camper?
Ed
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enblethen

Moses Lake, WA

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Posted: 11/13/08 11:16am Link  |  Print  |  Notify Moderator

Yes, and that is a good way of charging RV battery backup.
Some will say not to use alternator for charging but it does work. A lot quicker then using trailer connector. If you use alternator with jumper cables for maybe 1/2 hour you will have recharged a good RV battery enough to shut down TV.


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smkettner

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Posted: 11/13/08 12:01pm Link  |  Print  |  Notify Moderator

Yes you can run something with a jump. But to get a good recharge will take several hours.

TheHomelessGuy

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Posted: 11/13/08 05:14pm Link  |  Print  |  Notify Moderator

enblethen wrote:

Yes, and that is a good way of charging RV battery backup.
Some will say not to use alternator for charging but it does work. A lot quicker then using trailer connector.

I never camp at sites with hook ups, and don't have a generator. I can run the battery down to under 12 Volts and have it 100% recharged from my TV in half an hour using the 7 pin connector. Of course it helps that I ran a 10 gage wire from the TV battery back to the plug, and soldered the connectors after crimping for best connection.


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PapPappy

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Posted: 11/13/08 11:34am Link  |  Print  |  Notify Moderator

Batteries aren't too picky about where the voltage comes from, so it should work fine, but I would use it as an emergency suggestion.

If you bring along an inexpensive battery charger, that you can plug in at the CG, that should be sufficient...and I'd make sure the batteries are all up to snuff prior to leaving on the trip.

Start your pre-trip a few days in advance of departure, so you're not surprised!


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red31

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Posted: 11/13/08 11:55am Link  |  Print  |  Notify Moderator

Yes you can.

Coleman/Fleetwood/FTCA even offers a 25 FT. 12V Auto Extension Cord that would run the electral stuff off the TV cig lighter!

mike4947

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Posted: 11/13/08 11:29pm Link  |  Print  |  Notify Moderator

Actually quite a bit longer than that. As a wet celled battery reaches near full charge it takes longer per amp to charge.
But, you can cycle several times from 50 to 80% without shortening the battery life span providing it gets a FULL charge before you store the camper. Storing a wet cell battery partial discharged promotes sulfation of the plates. And as the plates are covered with the lead sulfide that area will no longer accept a charge.
Here's some links for a quick good educationon 12 volt sysyems and batteries:

http://www.ccis.com/home/mnemeth/12volt/12volt.htm

http://www.ccis.com/home/mnemeth/12volt/12volta.htm page 2

http://www.windsun.com/Batteries/Battery_FAQ.htm

http://www.batteryfaq.org/

http://www.trojanbattery.com/Tech-Support/BatteryMaintenance/Testing.aspx

Take it from an EX crowned king of battery kilers, treat your battery(s) nice and they will give you years of use. Misuse them and you'll find yourself at best buying new ones every year.
My personal record was from the middle of June to the first week of August to total destroy a very expensive, highest rated, Trojan deep cycle battery.


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ldennert

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Posted: 11/14/08 03:47pm Link  |  Print  |  Notify Moderator

I agree totally. Moreover, I don't think it would be possible to charge continuously at 30A through a 30A fuse without it heating up which creates more resistance. I'd bet a best case of 20A accounting for all the losses from the alternator to the TT battery. I run #8 wire and connections are just enough to keep the fridge on 12V, recirc fan, and charge the batteries a bit.

In real life it takes hours to charge those suckers.

ldennert

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Posted: 11/13/08 10:13pm Link  |  Print  |  Notify Moderator

Most batteries run on a 30A fuse. Assuming you could charge at fully 30ah it would take more than three hours to fully charge an empty 100ah battery.

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