I have a 400 watt vector inverter prower on board and it will not charge.. Is ther a fuse i should be looking at??

If you have a manual for the inverter check and see ifDin there are diagnostic codes with the LEDs.

http://documents.dewalt.com/documents/English/Instruction%20Manual/Vector/VEC1045.pdf

I looked through this and your description of the problem was not listed in the document, but you may be able to contact the manufacturer and get more information. Basically this is a DC to AC power conversion device, which takes the 12v DC input and converts it to 115V AC
and in does so at a maximum peak power of 750 watts at 115V AC. since your charge controller went bad, it is possible in the process it overloaded this device or the battery system put out too low of a voltage when the charge controller died and low voltage input is not something this unit was able to tolerate. Check your remaining components to be sure they are good, then look at the inverter's board and transformer to see if anything was damaged. I would want to verify the charge controller was good and the batteries in good condition - and perhaps consider replacing this inverter with one more suited to your actual load wattage requirements.

if it is used with 12 Volt battery, then
if fuse it to be connected on battery side, then it should be of at least 50Amp
but if is to be connected to AC supply side, then it can be of 3 to 4 Amps...
enjoy

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

Your laptop PS has big condensers in the input. Even supplied by mains through 6A quick fuse or automatic breaker it will drop first time, but may hold the second. Your inverter may be has fast fuse 2 - 5 A. If not so fast it may carry the initial load.

Hint: If you are not "both left handed" you can connect  20 - 200 Ohm (2 - 10 W) resistor in series to your Laptop Power Supply. After the initial start of the inverter you can shorten the resistor by a 3 - 5 A switch.

Inverter run on batteries sir, and if these batteries are not charged, the run time {the number of hours it will work} reduces.
S0, you will need to connect the inverter to a power source.Theses will allow your batteries to be charged and enable it to run for a long period of time.
Make sure your batteries are still OK.i.e working properly

off, never leave it on, danger of short if the clamps touch metal, turn it on only when you are using it to help start a car

It sounds like the fuse that protects you cigarette lighter is blown.

After you have replaced the fuse, check the voltage again. 0.015vdc would not have powered anything that in manufactured to operate on 12vdc.

When powering anything over about 250W, I would suggest connecting directly to the battery to avoid overloading the lighter circuit.

I would start with a 1.5 AMP fuse (175 watts / 12 VDC = 1.6 amp)
Make sure the fuse is rated for at least 120 VAC. Hope this helps!..Gary

it depends on what burnt in it, you should check it out to know

i have the same one ...and i'm not seeing a fuse, there may be one internally
does the inverter have strong "burnt wire" smell if so it is probably fried.