Forum Discussion

Frank_Mehaffey's avatar
Sep 30, 2018

charging of 2 camper batteries with truck alternator?

I have a 2013 Livin Lite 10' TC with 2 deep cycle batteries installed. I'm confused and/or confounded by the posts in different forums about charging the camper batteries with the tow vehicle.

The vehicle is a 2012 F250 with the camper package. I have 14.13 v coming out of the 7 pin receiver at the bumper. My camper has a PD 4000 Power Control Center which has a micro processor to provide 3 different charging levels. Boost for 14.4 v if the battery is low, 13.6 v for normal charging, and 13.2 if it is in storage.

At this time, we have no need for a generator with the appliances we use. We did have the original (1) camper battery poop out after about 8 hours of the furnace fan, in a 10 degree overnight truck stop while on the road. The next night, I left the truck on until midnight, which worked out fine. When we got home, I installed a second deep cycle battery, and it has provided more than enough power for the fan overnight for almost 2 nights. All our lights are LED's.

I have a 150 v alternator in the 250, and was wondering how long it takes for the truck electrical system to recharge the 2 batteries I have installed in the TC, and if I should have my dealer install a heavier gage wire from the truck camper plug to the PD4000 and if I should have someone check the wire from the charger relay in the truck to the plug in the back, to make sure it is heavy enough.

For the last 3 years, everything works fine, but I have been reading up on power/charging systems, and how the truck alternator should not be used to recharge depleted camper batteries. If we do some primitive camping in the future, I would like not to need a portable Honda to recharge the TC batteries, but just run the truck for the time necessary to recharge. I have a battery meter installed in the camper, so I know what I have in the batteries.

I am looking for advice on the advisability of charging the tc batteries while on the road or at a primitive campsite with the truck charging system exclusively. Or do I need a beefed up charging system. Some forums said to run jumpers from the truck battery to the camper battery. That sounds kinda strange to me, but that is why I am asking.

105 Replies

  • Frank Mehaffey wrote:
    For the last 3 years, everything works fine, but I have been reading up on power/charging systems, and how the truck alternator should not be used to recharge depleted camper batteries. If we do some primitive camping in the future, I would like not to need a portable Honda to recharge the TC batteries, but just run the truck for the time necessary to recharge. I have a battery meter installed in the camper, so I know what I have in the batteries.
    Charging with the alternator is fine in all conditions. The convenience of charging while in transit is the best part.

    As for just letting the engine idle it may take a long time to get a decent charge back in the battery. How many amps does the battery meter show that you are getting? 30+ is great, 20 is adequate and <10 is going to take all day. Many people only get a slow charge and don't want to idle the vehicle 6 hours to get 60 amp hours back in the battery. So they get a small generator and upgrade the converter if needed to get 40+ amps going into the battery. If you are parked in the sun much consider 200+ watts of solar to minimize running the engine or a generator.
  • Knowing the voltage is nice, but I think the real question is how many AMPS are flowing back to the house batteries?

    I'm sort of under the impression that the engine computer monitors the state of charge of the starting battery, and cuts back the alternator output to prevent over charging IT.

    It would also be nice, for the purposes of this discussion, if we had some idea how many amp hours we needed to replace in the house batteries.
  • If I understand you about the solenoid on the hot truck wire, I have no power in that truck side plug when the truck is not running. I think that solenoid is part of the camper package. I am waiting for Christmas and Santa (my wife) to put a 140w system on the roof! I am having a compressor put in for my air bags in a few weeks, and I will ask the installer to check the charging line. Thank you for the reply!
  • I would put a heavy gauge wire to your batteries. Of course how every your ground is run needs to be just as heavy.
    It doesn't have to involve your converter charger. Put a solenoid in on the hot wire so it is only connected when the ignition is on. I am sure there is this or that about charging completely dead batteries from your alternator but I personally would not be concerned. Actually you shouldn't discharge your house batteries lower than 12 volts or you will severely shorten their life in the first place.

    How you would go about this is all about the umbilical on the camper now and how heavy those wires are. If they are nice and heavy gauge then you just need heavy gauge to your plug in. If not you will need to bypass the umbilical.

    Now a good way to keep your batteries charged is solar and that is way cool but takes some work. But I love my solar I installed on my TC JMHO
  • Running the truck for two hours plus to charge the batteries is wasteful IMO. The absorption phase takes forever. Get a solar system. Beefing up your truck charging wire just gets you through the bulk phase faster.