Hello, good night, I hope you don't close the question. I built an inverter in the 12v to 220v school. The problem is that I want to connect it to a 12x80 car battery, when it is charged it has 13.6V and my investor starts to throw 280v at its exit, some circuit with 7812 that starts 12.5A up, with any power transistor?

And if you put a 12v regulator in the current input? I don't tell myself luck

Friend measures the inverter with load. In a vacuum it measures that tendency but it is peak-peak, not an effective value. Put some considerable burden on it and you will see how it drops to a reasonable level. It is possible to regulate what is a little more complex. Tell me of the results to continue helping. Regards