Dave do you have monitoring software ... if no check out solar assistant ... I have a couple mecer and RCT inverters using solar assistant ... cheap (R799 for the software only ) and easy to install.
On one site we have been having so major power issues ... using solar assistant has recorded everything ... all the dips and swells ... power outages etc etc.
it uses a Pi3B+ ... you can either buy the kit which comes complete with the Pi .. power supply and cabling or you can buy just the software.
remote viewing on your phone PC or whatever.
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