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Alternative power 1200 watt inverter, no power

My 1200 watt inverter keeps blowing one of the 25 amp fuses (F5)

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  • dave Conley Feb 16, 2009

    G'day mate, thanks for your quick response. I'm just trying it again, I just put a new fuse in and it blew without a load & switched off.

  • dave Conley Feb 16, 2009

    thanks mate, I think  your right, Ive pulled it apart but cant see anything obvious, now I have to get it back together. cheers Davo

  • Thomas F. Schneider May 11, 2010

    I am afrad that you have something shorted out. Maybe a diode? Takes some  electronic expertise now. Sorry.

  • Thomas F. Schneider May 11, 2010

    Is it blowing the fuse w/o anything hooked up?(W/O a load) Fuses normally blow whwen the load is higher that the available ampcapacity of the fuse. 

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SOURCE: aims 5000 watt inverter troubleshooting

The amp meter on this unit measures the battery current. So if you have an 8 amp load at 120 vac you will draw more than 80 amps at 12 volts and 40 amps at 24 volts. While this may not explain the 180 amps that you are seeing -- it's possible that the dryer is drawing more than 8 amps.

Posted on Jan 11, 2009

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SOURCE: Hi. I have a 5000 watt inverter in my truck. The

A 5000 wat inverter is very large. Your alternator could not supply it alone without the batteries. The moderate to low usage is the key. Calculate the wattage of the load you want to connect. Depending on what else you're doing with the truck, lights, heater, air condition etc, you could probably draw somewhere between 1,0000-1500 watts on that alternator. Rember even if your alternator is rated for 150amps (large alt) it is not a 100% duty cycle. Alternators are usually around 50% duty cycle, so figure about 75amps continuous, or around 900 watts. That's considerably less than your 5,000 watt inverter. Buy a generator.

Posted on Jul 01, 2010

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SOURCE: i have a 800 watt inverter an i use a 1500 watt

i have a 1000 watt 220 volt kettle what size inverter would i need i have 2 x n70zz baterys to conect to the inverter

Posted on Aug 02, 2011

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Why do the fuses blow out every time I plug it in


watts divided by volts equal amps so 400watts devided by 12 volts equal 33 plus amps if wires and fuses wont handle 35 amps they will blow to keep from burning up the wiring of your vehicle

May 14, 2015 | PEAK 400 Watt Tailgate Inverter Max -...

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What size of inverter do I need?


The correct size of inverter is an easy calculation and important to ensure long life from the inverter and the life of the appliances getting there power from the inverter. To calculate you take the volts and multiply by the amps which equals the wattage. Every appliance has a tag which must state the volts and amps. Locate the tag to find the information. Here is an example.

Under Counter Refrigerator 1.3 amps (120 volts x 1.3 amps = 156 watts)
Microwave (120 volts x 10 amps = 1200 watts)
Alarm Clock Radio (120 volts x .03 amps = 3.6watts)
TV (120 volts x .6 amps = 72 watts)

You now add all the watts together, since the above list could likely be running at the same time. There is a combine wattage of 1431.6 watts. In this example you would need at least a 1500 watt inverter. However given some unknown variables personally I would get a 2500 watt inverter. Less stress on the inverter, will lengthen the life of the inverter. Had the total been 1,000 watts a 1,500 watt inverter would suffice.

You must also remember that your alternator on your vehicle must be able to keep up with the power demand of not only your vehicle needs but your inverter needs as well.

on Apr 23, 2010 | Power Inverters

2 Answers

I have a 800 watt inverter an i use a 1500 watt kettle the inverter 15 amp fuse blew


The kettle is 1500 watt 800watt inverter is not big enough you'll blow fuse every time

May 25, 2011 | Inverter 1000-2000w Peak Surge Power

1 Answer

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.

Oct 19, 2010 | Duracell Portable Digital Inverter - 800w...

1 Answer

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

Oct 15, 2010 | Vector VEC024B MAXX SST Power Inverter

2 Answers

Can I connect vacum cleaner big one with Black & Decker 100 Watt power inveter


Hi,
No,
You will need a much larger power inverter than that to run that vac...

heatman101

Apr 22, 2010 | Black & Decker 100 Watt Plug-In Power To...

1 Answer

When I turn microwave on it blows 60 amp fuse


60 amps times12 volts = 720 watts times 80% effic of conv. = 576 watts available for microwave...

You must have a very tiny microwave as most require at least 1000 watts input power. That might have something to do with blowing the fuse. Since the microwave has a very reactive inout, you need a goodly safety margin above the rated watts input.

Jan 10, 2010 | Cobra Power Inverters

1 Answer

Power drop


Hey, Question: Is the 2400 watt the peak rating or the continuous rating of the unit, and what is your power source for the inverter. If 2400 is the peak, the 1200 is probably the continuous. Your 75 watt fridge will draw probably 150-170 watts to start up, which will load the inverter to draw 15-17 amps of load on your 12 volt power source. If the battery supply is weak, the current draw at startup will cause the voltage to drop and set off the alarm. Getting the start up out of order may work for a while, but will eventually blow the internal fuses on the inverter, or possibly blow out the capacitors. Check the condition of the battery supply, and make sure the bar fridge is in good working order to resolve this problem.

Jul 18, 2009 | RoadPro RPPI-2500W Inverter

1 Answer

2000 watt inverter blows 60 amp fuse under load


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.

Jan 13, 2009 | Atd Tools 2000-Watt Power Inverter # 5955

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