This is happening on 12 24 and 48 volt Smart Solar Charge controllers and Phoenix inverters and it happens in milliseconds of time even when there is a no load on the inverter and when there is a load on the inverter. It is also happening with the smart 75/15 charge controllers. Also, the load state of the controller default is always on but we are have issues with some of them going to load state off and not being able to be changed to always on?
One possibility is an instantaneous voltage dip as the inverter is connected.
Solution may be to put a delay in the load off settings if the MPPT.
Just to close this topic out and for future reference, this is why the manual of the controllers with load outputs specifically states they should not be used to power inverters - it won’t work well if at all, and may cause damage.
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