My inverter was throwing Overload messages, randomly shutting down with as little as 200Watts connected to it right out of the box. Strangely the problem went away as soon as i lifted the Battery voltage from around 50 to 58 Volts by adding two more cell blocks. Of course EG4 never replied to my desperate outreach for help, i wasted at least 60 hours of my life trying to figure this out. I guess the root cause of that problem was a faulty transistor from the beginning and not the battery Voltage.
See my posts on that topic here: https://diysolarforum.com/threads/b...ng-w028-eps-overload-code.83751/#post-1096588
My bet its one or several MOSFET, thats the typical part that breaks on these inverters, 99.999999% of the time. Plus i have a good BMS in the chain set to 150Amps that would have avoided frying the whole bank of transistors.
