Question about Inverter AIMS Power 5000 / 10000W

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I was running a hammerdrill (13 amps full load)with my AIMS 5000 watt inverter for about 45 minutes with about a 80% duty cycle. It ran fine for that hour and then the AIMS 5000 quit. Since the AIMS says it is thermally protected and overload protected, I assumed that it had overheated, and some overtemp thermal breaker had opened, and that after a while it would start running again. It took several hours, but it actually did start running, but now it will only run for about 5 minutes, even with no load, and then it shuts down again. What do I need to do to fix it? Thanks, Steve

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  • sgreen652 May 13, 2010

    I have an AIMS 24 volt 5000watt inverter that is connected to a battery bank of 4 Trojan L16 batteries. The batteries are charged by a photovoltaic solar panel array. The AIMS produces 120 volt AC power. Recently I was running a hammerdrill (13 amp full load amps) and it worked fine. 13 amps at 120 volts is 1560 watts, so I felt that the load should be withing the capacity of the 5000 watt AIMS inverter. However, after about 45 minutes on about an 80% duty cycle the inverter shut down the AC. Since the label on the AIMS says that is thermal overload protected, I assumed that it would turn back on in a few minutes. However, it took several hours before it turned back on, and thereafter, it would turn itself off after just a few minutes, even it there was no load at all on it.
    What do I need to do to fix it?
    Thanks,
    Steve

  • sgreen652 May 13, 2010

    Yes, the solution was helpful. Thanks.

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You have overstressed the Output devices, in the unit, this is a very common thing, they are "Damaged" generally, they use some sort of FET switching, semiconductors, and those transistors have become damaged due to large, continuous, gate current drives on their gates, this cause ablation between the Drain & Source, or equivalent, layers, this, increases the internal resistance and that causes then to go into runaway state very quickly, they self oscillate and eventually will totally destroy themselves if the same conditions apply. These need to be replaced, they will have to be replaced on Both sides of the Output drive. You see electromagnetic devices are NOT really the best to use on a device like that, really you need some sort of Motor generator/Alternator, and NOT a semiconductor switching unit, Inverter, you see an Inverter like you have is really only suitable for Electronic things, it is NOT really suitable for things that must generate magnetic fields, IE: Motors, heating elements, Electromechanical devices, as the reflections and spikes given out and back by the rising and collapsing magnetic fields, soon saturates the Driver Semiconductors, and will cause them to fail. Whenever you wish to power something like that, you MUST use a generator, or an Alternator, and that will work OK, as they have little electronics, on the Output, it is more sinusoidal, and drives magnetic, motor, and electromechanical & heating devices, much better. You may be able to run those devices, BUT only for say, 5 to 10 mins at a time, with a large period between uses, and even then, it will still eventually succumb, if used like that.
You will have to get a Service Manual, to have any chance of effecting a repair. Also obtaining the Output semiconductors and possibly driver semiconductors too, will be difficult to source, I would suggest the manufacturer direct.

Posted on May 13, 2010

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The internal overload needs changing. The units are not meant to supply that much power for so long.

Not only will you cause damage to the invertor, but your vehicle's electrical system (alternator) is under tremendous strain.

THanks!!

Posted on May 13, 2010

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