Micro Control Inverter Power 600: No 230V Output, Firing 30A Fuses, 12V Battery Connection

I bought new wires thicker and now the fuses do not crumble but the red diada overloads and squeaks. I did not connect any device, the battery got out of the car and measured the meter and showed 12.6 v. On the 0 V voltage converter socket. The transistors are the same in the inverter (it is possible that two are released). Is there any hope of repairing the inverter?

Added after 46 [minutes]:

I think something works because I recharged the battery and the red LED from the inverter does not light anymore, so the battery was weak. I am still charging up and checking the voltage in the inverter socket.

Added after 12 [minutes]:

I have connected and the normally green LED in the inverter has come on and on the battery it has been 12.8 v after charging. The socket still has 0 V and two transistors which I recently exchanged for new, after checking the meter conduct current in both directions because the meter squeaks and should display around 450 and shows 001 and no current conduction should show 1.

Added after 11 [minutes]:

Cables did make a short circuit, but I would know that after replacing two transistors, I will admit that once I closed the door, the wires caught, but the inverter was still working, just as I connected the drill and began to drill the fuses got out of the converter.

one diode was blown on the transistor, i.e. even when I bought a new transistor, it could happen that the transistor burns again, some of it costs about PLN 45 in the shop, but there is no 100% certainty that it will work.

Is it possible to give any substitutes, i.e. 4 transistors, preferably IRFP 450

I replaced some transistors and the inverter turns on and after checking the meter on the output of the socket and showed 20 va how I switched to direct current it shows 9 volts strange. My question is, what does it take for a 230 volt current or transformers to burn out?