1. leannamarie

    leannamarie "California Girl"

    I need some help with an APU. Hubby just got assigned a truck with an APU and inverter, or so we thought. We are now discovering that the electrical plug will only work when the APU is running. What good is that? Are we doing something wrong here? It looks like the APU is a Proheat Gen 4 by Teleflex Power Systems.
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  3. Captain Canuck

    Captain Canuck "Captain of the Ship"

    Apr 7, 2007
    Woodstock, NB, Canada
    Sounds like the electrical outlet is connected to the APU, not the truck batteries. An inverter would be connected to the batteries, then the APU would charge them.
  4. leannamarie

    leannamarie "California Girl"

    Why would anyone make it that way? What good is the outlet if it can't power anything unless the truck is off and the APU is on?
  5. gearjammer-2000

    gearjammer-2000 <strong>Clutch User</strong>

    Dec 18, 2007
    columbus Ohio
    use the inverter when the APU is not running, in fact I get my 110 power from the inverter all the time and the APU is used for heating and cooling and to keep the batteries charged, I only use the generator to run the block heater which is hardwired to it.
  6. lostNfound

    lostNfound Road Train Member

    Jun 28, 2007
    Home of the Stampede
    They all work that way and they have no power when shut off as they don't have their own battery bank. As stated, add an inverter with a direct hook-up to the batteries (assuming the company allows it. Or, what they don't know... :biggrin_25525:). This way 110 power will be available whether it's the truck engine, the APU, or no engine. I am same-same as gearjammer.
  7. Otter

    Otter Light Load Member

    Mar 16, 2008
    Milton, VT.
    My APU doesn't have an AC generator, I use an inverter for all my AC and run the APU for heat, A/C, and power (12Volt 165 Amp.)
  8. bbkeo

    bbkeo Light Load Member

    Oct 7, 2007
    winston salem nc
    Mine is the same way. It can be a little of a pain but that is just the way it is set up.
  9. 25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

    Sep 18, 2006
    the road less travelled
    Some were set up with an alternator that only worked with the APU running, The inverters were unhooked in trucks not running OTR, now I have neither in the Columbia, but the Star is still considered OTR, so its' inverter is still connected. The APUs are non operational,don't know what the next truck will have in it.
  10. Tuckster

    Tuckster Light Load Member

    May 12, 2008
    Hanover, Va
    I have the same situation. Where is the best place to get these modifications done.
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