Why does the gas generator turn off when the load is connected?
Is the generator good? Or “Chinese”, if so, then its watts may be “Chinese”, which means that it will not hold a load of 1.9 kW.
The next question is - is it possible to connect the device to the network for verification?
To reduce inrush currents, if possible, you can pre-spin the engine, for example by winding the cord on the shaft and pull, then press the power button.
There is also the possibility that the motor windings are broken, that is, inter-turn short circuit or short circuit to the housing.
By the way, before you connect the load, the gas generator should work a little and warm up. Also, the engine may stall even due to poorly adjusted valves, a bad spark plug, a carburetor, and even a clogged filter and fuel cock. That is, the problems of ICE.
It’s just hard to give an answer without seeing the whole situation.