DennisD

I had the same issue with another inverter brand.  The electrician then did the bond on neutral and earth (apparently this is common practice). According to the electrician it is illegal to have higher than 20v(If I can remember correctly) on the neutral. ( I am not an installer or electrician just sharing what happened during my installation)
Have a look at this Goodwe installation video :  (take note at 03:10)
 

I have also noticed at our office where we have led tube lights installed that some of the lights had a dim glow even if switched off - those lights were not connected properly (live - live, neutral - neutral).  They were instead connected live-neutral and neutral to live - as soon as that was fixed on the light connection side the lights worked correctly.

I had the same issue with another inverter brand.  The electrician then did the bond on neutral and earth (apparently this is common practice). According to the electrician it is illegal to have higher than 20v(If I can remember correctly) on the neutral. ( I am not an installer or electrician just sharing what happened during my installation)
Have a look at this Goodwe installation video :  (take note at 03:10)
 

A single Pylontech can discharge at 25A which is 1200W at 48V continuously. If this is within your load requirements, the Pylontech will last much much longer than the AGM.