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Sprinter RV's & Conversions Talk Common features found in Sprinter RV's and Conversions.


 
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Old 06-20-2011, 03:38 PM   #11
Graphite Dave
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Default Re: electrical question

I suspect the other problem is how you would limit the amperage to the plug capacity when the house battery is discharged.
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Old 06-21-2011, 02:37 PM   #12
ccutshaw
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Default Re: electrical question

jmgasior

The easiest way that I found to charge my house batteries while driving, was to run a battery cable from the back of the alternator to the house battery. You can protect your charging system by installing a panel mount DC circuit breaker from a solar supply store. You can use the breaker as a switch to disconnect the house battery when ever you want.

http://www.delcity.net/store/Switches/

Hope this helps, good luck with your project. Calvin
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Old 06-29-2011, 10:18 PM   #13
jmgasior
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Default Re: electrical question

how confused can i get,looking at the sprinter aux battery guideline it uses a mopar cutoff relay,is this any good? or shud i look elsewhere,thanks
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Old 06-30-2011, 03:37 AM   #14
Graphite Dave
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Default Re: electrical question

I used the Mopar isolation relay part # 05120361AA which is the same relay that Mercedes uses if you had ordered the auxiliary battery. It mounts under the drivers seat on the NCV3. The purpose of the relay is to prevent the auxiliary battery from being connected to the vehicle battery unless the engine is running. The relay coil is powered from the D+ terminal under the drivers seat to one small coil terminal on the relay. The other small coil terminal of the relay is connected to one of the ground studs under the seat on the floor with all the brown wires attached to the stud. When the engine is running the relay contacts close. I take power from the terminal block attached to the vehicle battery positive post to one of the large terminals of the relay and then from the other large terminal of the relay I go to the positive post of my vehicle inverter. The vehicle inverter negative post is connected to one of the passenger seat floor bolts. So the vehicle inverter will not operate unless the engine is running. That way I can not run down the vehicle battery by using the inverter without the engine running.
Two problems with the Mopar relay are: 1. Relay mounting holes did not match any hole pattern under the seat so i had to drill two new holes for mounting. 2. The relay does not have two simple coil terminals as any intelligent person would design it. Instead it has some funny German connector. I bought the funny connectors and found they need some other strange connector so gave up on the German engineering stupidity. Found some spade connectors I could push onto the terminals and added some plastic insulation between the two terminals and potted it with silicone. Relay works as intended.
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