My questions are: 1) Why did it blow up when the unit was being turned off? 2) If I start the car with the Inverter connected will it do any harm to it, and why? 3) I see three pots on the board, and am decent with a soldering iron. The fans were working at the time of the fireworks. There are eight other MOSFET's on the opposite side of the board, LVP640's (N Channel also). The MOSFETS are Fairchild FDP8770 N-Channel. Two years later I broke out the electronics gear and decided that I would try and fix it (the fact that another storm had passed through leaving us without light again probably had something to o with it!) I found that the MOSFET's on one side of the circuit board, all eight of them, were completely gutted. I know enough about electronics to figure that the inverter was toast. I then experienced a very dramatic fireworks / light / smoke show. Had the unit going for about eight hours, then decided to give it a break and turned it off. I used my car to run the system, but had another, larger battery in parallel with the car battery. I ran the output through the breaker box in the house, which is grounded. Hi all, I have a WAGAN Slimline 1500 watt Inverter. The characteristics of this switch are what determines how much current the dc side of the device can source. (your inverters configuration could have anywhere from 1 to 4 based upon design) For those who dont know what a mosfet is, its simple enough to say its a kinda like a really fast switch.
At the heart of this system is two N channel MOSFETS. dc-dc converter (boost) The boost topology can be made smaller and lighter than huge transformer systems, like an APC or UPS power supply. the boost stage amplifies the current from a lower voltage to a higher voltage, all in a DC environment. Below is an MS Paint rendition of the first stage of a boot dc-dc.
to increase the power output, the amount of output current the device can source is increased, whereas its output voltage remains the same. For the record, a power inverter converts ~ 12V dc-> ~120 AC (normally non-sinusoidal). This instructable is a guide for repairing/increasing the output power of a simple dc-AC power converter (this instructable address the boost dc-dc converter based power inverter).
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