Question about Atd Tools 2000-Watt Power Inverter # 5955

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2000 watt inverter blows 60 amp fuse under load

Ran all 8 guage wire and running a battery charger off of the inverter in a service van. could we get away with a bigger fuse or do we require a larger inverter?

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I have a background in electronics so i hope i can help. Now after reading this i have the feeling this item does not put out 2000 watts cause if that were the case it should draw somewhere near 147amps. This is because to find out amps you need to take the 2000 watts and divide it by 13.6 volts (assuming what the vehicle runs at) that gives you amps. watts/volts=amps.

Posted on Apr 02, 2009

  • viper264 Apr 02, 2009

    This is the first time i posted on this site, lol i was looking for information on my audio amplifier and i stumbled onto this.

    Also i forgot to mention, you need larger wires make sure they are pure copper and at least 4 guage.


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Well without knowing exactly how you wired it, it is hard to say what happened. A little diagram would help. But, with nothing plugged into the inverter, the wires must have been shorted. What size wire are you using? If you have an 800W inverter, the amperage on the secondary, (120V) side is only about 6.5 amps. So if you ran 14 ga wire (smallest you should use on 120V ) that should be fine for the 120V circuit. Do not connect any of these wires to anything but your remote receptacle. Now for the primary. Notice how large the terminals are on the supply side, if you have an 800W load @ 12V that would be approx 66amps. Therefore you should have #4 or #6 copper wire going from the battery to the inverter. This wire must be fused, and I'd fuse it with a 60A fuse. You can buy nice fuse holders like they use on amplifiers that connect right to your battery. Now on the 1200W unit, you can imagine the difference. The secondary would be 10amps and the primary would be a whopping 100A. Even if you have a large alternator, I'm sure it is not rated at 100 amps continuously.

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