Rooftop AC unit

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 85COE, May 20, 2022.

  1. 85COE

    85COE Light Load Member

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    Imma do some research and apparently a rooftop RV AC unit needs a 50 amp breaker, that's why a generator is used to run them. You think it would be okay to run it while driving and or idling?
     
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  3. kranky1

    kranky1 Road Train Member

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    Have you looked in the dash to see if the wires for a/c control are hanging out of the harness somewhere unused? If the wires are there already I bet it would be pretty easy to retro the factory air stuff out of another White or some of the Volvo-White-GMC’s that may be laying around into your truck. That’s probably worth looking into at least.
     
  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    I thank it wound would need to be wired directly to the alternator. There are some 180 - 200 amp alternators these days that might do that at idle. Yours will not. I am not sure how they will stand up to that amount of current continual.
    At current fuel prices a generator wound pay for itself in short order over idling the truck.
     
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  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    I thank your cab is the same as a Road Boss II. Maybe later but the conventionals shared the same cabs. That gives you a lot more options to look at.
     
  6. loudtom

    loudtom Road Train Member

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    You're not going to run 50 amps AC on an alternator. When I get close to 20 amps, the voltage drops too much to keep up and the inverter resets. If you try to run a generator while driving, it will probably shut down due to low oil protection activating from the movement of the truck. I have plugged my mini split into the inverter while idling, and dash voltage drops to 12.4 while cooling on a hot, sunny day when my truck AC was not working. It may have eventually leveled off somewhere around 13.1 I'm guessing, but I didn't stay parked long enough to find out. I'm pretty sure it's only a 15 amp appliance.
     
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  7. spindrift

    spindrift Road Train Member

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    An RV rooftop A/C has a peak load of about 21A. Larger RVs with two A/Cs, microwave, coffee pot and other accessories will have a 50A service.
     
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  8. 85COE

    85COE Light Load Member

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    I don't have any AC controls. It's only Hot/Cold and Defrost options. I'm upload a pic later.

    I thought about putting in a compressor, but wouldn't that require some major work due to belts?
     
  9. 85COE

    85COE Light Load Member

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    So far, the smallest I've found is 11,500w. I'm thinking if I can find a 5k or so, I should be good.
     
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  10. spsauerland

    spsauerland Road Train Member

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    You just wanting to retrofit your existing A/C or trying for sleeper setup? If just trying to get A/C look into Vintage air that they use in hotrods Vintage Air Builder Series - Vintage Air. @W900AOwner did this with his truck and it is the plan for my 82.
     
    Last edited: May 21, 2022
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  11. spindrift

    spindrift Road Train Member

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    Very affordable.
     
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