Meanwell 600watt modified sine wave inverter pre-mature overload

Hi. I have a meanwell 600watt modified sinewave inverter. It is running fine under small load but goes into overload pre-maturely under higher load. I cannot find any circuit diagrams to diagnose the problem. Does anyone maybe know how to overload protection on these inverters work?

Model A300-600

Volkvanmyn25 said:

fine under small load but goes into overload pre-maturely under higher load

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small load = ?, higher load =?
What load?
How are you measuring output power?

It's working when I connect an 11watt bulb. It is going into overload when I connect my 40watt soldering iron. The main purpose that I have been using the inverter for was to drive a 200watt submersible water pump to collect water from spring.