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Someone help me please

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I've got a Huanyang 2.2kw inverter FT3000 series.
For some weird reason it does not have a ground connection.
Without it, it just trips the circuit-breaker in the power-board after about 5 seconds.
Where the yellow warning triangle is there is no screw and no connection to anything on the back of the circuit-board, just a soldering blob :confused:
How can I make a earth/ground connection to make the inverter work?
TIA
Wolffie

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