Anyone repair inverters?

Works! Got 10 new MOSFETs and replaced all 8. Although it says 1750W, I tried a 1000W sawzall or an 800W die grinder and both tripped the fault, probably not designed to give that much so fast. It did light up a dual F40 shop light and a 90W laptop power supply, I really only needed it to do the laptop and maybe a 20V Dewalt battery charger. My little lighter socket one would start to melt if I put the old laptop on it. Had to put an A/C duct hose onto it. The little watt meter doesnt even register the 90W power supply...? Maybe its not pulling that much, but I did see it jump when I turned on the sawzall for a split second. It has a remote RJ11 (phone plug) switch on it too, so I can run a switch to the dash to turn it off. Killed a few batteries in my old truck with an inverter on over a weekend.