Solis Inverter - Alarm code 1030 GRID-INTF

So I'm new to all this stuff and have no comprehension of grids/voltages etc, so my issue is:

As the inverter is powering down of any evening, I get a notification of an alarm error code 1030 GRID-INTF. By the morning, when the sun comes up, the error has resolved itself and the inverter seems to chug along happily all day.

This has been happening since it was installed just about 3/4 weeks ago .

The installers came out today and replaced the whole inverter, but sure enough, this evening I got the same notification, same error.

I've dug around everywhere I can trying to find info as to what this means in laymans terms and what's to be done about it. 

I have found this, but it really doesn't mean anything to me or give me a resolution:

https://ginlongsolis.freshdesk.com/support/solutions/articles/36000052078-alarm-code-overview-for-solis-inverters

Any ideas as to what's causing it and how to fix it, or does this happen to everyone's inverter when it shuts up shop when the sun goes down?


'I think that God, in creating Man, somewhat overestimated his ability'..Oscar Wilde

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