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I know this is an old post but I'm having a similar issue that's driving me insane. So, I have a 5kw sunsynk inverter back up system. When first installed it was running great but then it didn't take long until I noticed that my borehole pump would trip the EL on the essentials board which is where that plug circuit is for my borehole pump. It was intermittent and never got to the bottom of it but did notice that it only happened while the grid was on. Other than that it's been running fine for the last year or so, until 2 days ago. My essentials board E/L trips every time the grid is supplying to the inverter or directly to that board. If I have my change over switch to grid it will trip. I then switch down to inverter and then it works fine. The main CB feeding the inverter has to be off though because otherwise the grid supply passes through and trips the essentials E/L again. It did seem like it was the circuit for the borehole pump that was the issue but the E/L still tripped even after plugging the borehole/irrigation system out. It now trips even if all the breakers in the board are off.