Inverter from UPS Always NT-600?

Question

Electronics

I redid the inverter from the NT-600 UPS for a car, that is, 12v-220. Faced the problem of shutting down the UPS after 30sec-1 min after turning it on. I sin on the so-called Green Power system.
Here is the circuit that I managed to find on it:

Help with determining the resistor that needs to be soldered in order to disable this function?
Or, at least, a plan for how this resistor can be determined. Thanks in advance.
Addition: I conducted an experiment, connected a "lamp on a wire", with a 60-watt light bulb, such a system does not turn off, it worked for more than half an hour, and I connect a subwoofer (for which this inverter was actually made), it turns off. Continues to work only when the sub is turned on "to the full" volume.