straining tripac alternator?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by pbrstreetgang, Jan 7, 2018.

  1. pbrstreetgang

    pbrstreetgang Light Load Member

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    i recently heard someone use this analogy: an alternator under a load is kinda like a healthy person walking, running, and sprinting, depending on the load. a healthy person can walk 50 feet or 5 miles and the strain is pretty much the same, but sprinting is a completely different story - there’s a HUGE difference between sprinting 50 feet and 5 miles, no matter how healthy you are.

    at what point am i straining my tripac alternator? depending on what i have running in my parked truck, i can look down at the voltage display on the tripac power inverter and see a variety of different numbers. for example:

    a/c only - inverter shows a constant 14.1
    a/c plus running lights - constant 13.9
    a/c, running lights, fog lights - constant 13.7
    a/c, running lights, fog lights, tv and video game - constant 13.1
    small ceramic heater (when espar d2 isn’t working) - constant 12.2

    etc etc etc

    i often find myself sitting for long periods of time, and i just hang out and run stuff of the tripac. and if i’m in a crowded truckstop at night i keep a crapload of lights on so no one smashes into me. at what point is the alternator “walking” and at what point “running” or “sprinting”?
     
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  3. Brandt

    Brandt Road Train Member

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    It's designed for a amount of work. Not very good in my opinion. I had a tripack, the older and i only had it like 1.5 years and repaces alternator two times. They are only like 70amps.
     
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  4. Ridgeline

    Ridgeline Road Train Member

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    Two things.

    1 - get the upgrade to the 120 amp alternator. If you have someone who knows what they are doing, you can have a 200 amp delco put on the machine. There is nothing special about the alternator.

    2 - why are you running fog lights when stopped. If you are not parked on a ramp, turn all the lights off.

    sort of 2a, maybe you need to reevaluate the gaming thing.
     
  5. Justrucking2

    Justrucking2 Road Train Member

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    Having owned a few Tri Pacs over the years, your main concern are your batteries. You are over taxing them, more so than the alternator. Running everything at its limits is not what the Tri-Pac was designed for nor were your batteries. Truck batteries are for starting, not running microwaves and or leaving the lights on all night when sitting with the motor off.

    Use some commonsense and you will get years of use out of the Tri-Pac. Open the case up a few times a year and wash her out with a power washer, keep her clean. Service on a regular basis, I like to service every few months, or quarterly.

    Then your batteries, I have switched over to AGM. They tend to hold up better, as they are designed to run those accessories in our trucks more so than the old lead acid models. But, they are batteries, they age and they fail. Some guys go with larger batteries if they have quite a bit of things running on their system. But for the average trucker out here, I really do not see the need to go that route.

    I am having a new Tri-Pac installed next week, it will have the larger 100+ amp alternator and I will be installing a new set of AGM batteries. These new Tri-Pacs, the controls, are designed to keep the AGM batteries properly conditioned. Something the older units like I have were not set up to do.

    Again, just use some commonsense.
     
  6. d281833

    d281833 Heavy Load Member

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    Fog light crap should be attached to an eject seat... turn'em on, you're gone.
     
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  7. Dave_in_AZ

    Dave_in_AZ Road Train Member

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    I'm extremely conservative with my batteries. I've never been big on truck fridges, they are too small for anything really. I mean you beat the hell out of $1,000 worth of batteries for $15 worth of food. That's just pure F genius.

    I like my truck to start. I have a tripac, and use my laptop, and have it running the AC or the heater, but I don't leave my parking lights on. I'd like too, it is cool, but like I said, the truck starting when I plan on it starting is pretty cool too.
     
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  8. pbrstreetgang

    pbrstreetgang Light Load Member

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    i'm surprised to hear this - my first alternator lasted 8 years
     
  9. Justrucking2

    Justrucking2 Road Train Member

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    I put a new alternator on a few years ago, when I bought this truck in 2013. The Tri-Pac looked like a bomb went off inside the case. I took it to ThermoKing and for $1500 they got her running. The alternator has been replaced once since then, under warranty. I have around four years on the current alternator. I am on my second set of batteries in five years, new set going in next month... I think that is pretty good.
     
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  10. pbrstreetgang

    pbrstreetgang Light Load Member

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    thanks for the advice - i wasn't aware there were different size alternators for the tripac. as far as fog lights, i gotta ask, what planet are you driving on?? i've been hit in truck stops 3 times!! i want as much lighting around me as possible. when it's REALLY dark i'll run the fog lights AND the headlights. never underestimate the complete apathy of moron drivers, especially when you get closer to bigger cities like LA and chicago. these guys just DO NOT CARE if they smash into you. driving is not a career for them - it's just a crappy job and if they obliterate someone's truck FINE. most can't even speak english
     
  11. pbrstreetgang

    pbrstreetgang Light Load Member

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    Sep 7, 2007
    California
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    i appreciate all the good advice...but still there has got to be a line between straining the alternator and not straining it, and i still want to know. the tripac was built to run the a/c, which brings my voltage down to 14.1. now, fog lights without a/c it's like 13.9 or 14. however lots of people saying fog lights are obviously too much, well i'm having trouble understanding where that line is between normal use and straining
     
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