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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Hi. I keep blowing inverters. I had a 1200 watt Coleman that went out while running a fan. Just installed a Cobra 800w inverter in my Dodge Ram under the center console. I had it wired to an outlet on my...


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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My name is Gena. The VEC024B that is being used by our field technicians are having problems with the fuse blowing in their work vans. Their vans are equipped with laptops.


Hi Gena, the inverter is a 400 watt unit. This is not a rating for a continuous load. You do not mention which fuse is blowing. This could be the fuse in the inverter or the cigarette lighter (power source) fuse. In either case, a fuse blowing could be a short circuit, something in the inverter shorted, or too much load. I am going to look at the too much load side of things. Not knowing how many laptops are being used, with the inverter if you have a 20 amp fuse in the cig lighter, this will allow you 20 amps X 12 volts = 240 watts. I would not run the inverter over 240 watts because of overheating issues. So, 240 watts will run 3 laptops. Just the laptops. Most laptops draw around 70 watts. check your power supplies on them to find their rating. If you exceed the 240 watts by combining the ratings, then you can expect trouble with your inverter. It will give 400 watts, but this is a temporary condition only. Another inverter will be needed or a larger one installed and it being connected directly to the battery (with a fuse of sufficient size installed). You could also (let us say there are 6 computers) charge and run 3, and the other 3 are running on their batteries. After an hour, switch so that the 3 running on batteries now are charging as well as running. The other 3 are now charging.
I hope this helps. If you have any other questions please provide additional information. Such as the size and location of the fuse blowing. The laptop power supply ratings.
thank you

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Are you wanting to install circuit breakers on the DC (battery) side? If so, you won't need them to protect the unit as it is already fused. But, it would be a good idea to install them as close to the battery so that if a wiring fault develops in te cable going to the inverter, it would be protected as well.

For the AC side, breakers are sized according to the wire size, not the capacity of the inverter. But, you can always use a smaller size if you want to try and protect the inverter from overloads as well. Your inverter is rated at 1000 watts, which is a bit over 8 amps of AC current. Use a 10 amp circuit breaker, and don't use smaller than 16ga wire for short distances. Use larger guage wire (12ga is 20amp residential requirement, 14ga is 15amp residential requirement) for the longer runs.

This inverter is not designed for a permanent install, its not intended to be run continuously. There are inverters designed for this, you can find an idea of product selection at rv suppliers, alternative energy shops, etc.

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