Question about Black & Decker Husky 750w Power Inverter

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Where is the fuse(s)? What is correct replacement amperage?

Stupidly misconnected to car battery - I have the case off but don't know what I'm looking for. Is there an interior picture that could help.

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Look for 3 - 40 amp fuses side by side near the fans, inside the unit

Posted on Oct 19, 2009

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How to change blown fuses


Ben, Power Inverters of different make and style use different fuses, I will post links for you to check out.
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Why does the battery volt button show 12.1 v when the battery doesn't have enough juicy to start the car? I thought it would show me the volts the battery had


The meter shoes the battery voltage, not the amperage. It may have 12V but still not supply the current (amperage) you need to turn over the starter.

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The settings for welding aluminium using a Tig200P AC/DC inverter


If you are using a remote then you would set the machine in standard for controlling output and also to AC output, HF tig, contactor and control in remote position. I don't know if this helps or not but I pulled it from an owners manual.


1/16" (.062) - pre-flow .1 sec., hot start 20, amperage 70, Hz 100, balance 20%, post-flow 6.0 sec.

For pulse settings - set pulse width 60%, peak current 100, background current 30, Hz 1.0

1/8" (.125) - pre-flow .1 sec., hot start 20, amperage 150, Hz 80, balance 20%, post-flow 6.0 sec.

For pulse settings - set pulse width 60%, peak current 150, background current 50, Hz 1.0

3/16"-1/4" - pre-flow .1 sec., hot start 20, amperage 185, Hz 60, balance 20%, post-flow 8.0 sec.
For pulse settings - set pulse width 60%, peak current 185, Background current 125, Hz 1.0

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1 Answer

It does not seem to be charging the batteries. 12 volt lights work good for about 2 days then go dim until I put a charger on the batteries and bring them back into working order. The battery connect...


The Parallax 7155 converter should not require battery support for any 12 volt load amperage that is less than the maximum amperage capacity of the converter. A standard RV incandescent 12 volt lamp draws about 1.5 amperes for each bulb. With the battery disconnected and other 12 volt loads off, turn on lamps (not fixtures) and calculate the number of bulbs which can be turned on. If you run out of lamps, turn on vent fans etc. The idea here is to try to get to 55 amperes of DC load if possible without going over 55 amperes. At a sustained DC load of about 25-30 amperes or higher, the fans should cycle on continuously after about 5 -10 minutes. Lamp brightness should be normal and the measured voltage from the converter should be above 13 volts if under 55 amps of DC load. If the voltage drops with only a few lamps on, a converter issue would be likely.

Diagnostic tests an RV technician should make would be to:
1. Disconnect the battery system.
2. With the converter system powered on, measure the DC amperage with a DC ammeter capable of reading at least 60 amperes DC from the blue lead at the DC fuse panel terminal VCC.
3. Measure the DC voltage at terminal VCC and DC ground.
4. Record both readings.
At any DC load amperage less than 55 amps, the voltage should be above 13.0-13.2 volts DC. This method should take out all guesswork and confirm a DC converter section issue or not.

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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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1 Answer

Fuse fail


When we talk about a short circuit,it means that, there are two wires or cables touching or making a contact with each other.For example a red wire touching a black wire.
how can the short circuit be corrected?,
  1. Take a look at the wires carefully and see if there are any two wires touching or making a contact with each other.If there is any of such separate them.
  2. Check if there are any wires getting burnt. When wires burn they tend to come in contact with each other.If there is any burnt wires replace them or insulate them very well.
Do the above for the wires bringing the input into the inverter and the battery cables.

Note. a short circuit is a union or contact of two unlike poles like positive and negative,black and red

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1 Answer

Blows 15 amp car fuse as soon as switch is turned on nothing plugged into inverter


If the fuse doesn't blow until you turn the inverter on, the problem is in the input circuit. First, be sure the polarity is correct when you're connecting the inverter. If you manage to get the 12 volts hooked up backwards this will blow the fuse. If the input polarity is correct, the diode inside that protects against reverse polarity may be shorted. Beyond that, it's difficult to make any suggestions about what parts to check. You would need to use an ohmmeter to check the parts in the input for very low readings from the 12 volt input to ground. If you can do this yourself or know someone who can, it might be worth a try. But if you try to take this somewhere for service - if you can find a shop willing to look at it - it may be more economical just to replace it.

Good luck with the inverter, and thanks for using Fixya!

Nov 24, 2009 | Powerline 0900-73 Slimline Inverter

1 Answer

Power hook up


This type of inverter has large alligator clips on it because the amperage that comes through a cigarette lighter is insufficient and can result in blown fuses and overheating of the socket. Hook this one up directly to the battery without splicing a longer wire to it.

Apr 22, 2009 | Black & Decker Husky 750w Power Inverter

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