Inverters failed to start scheduled charge and are now AWOL

Both inverters / batteries failed to start charging at scheduled time (1:00am) and after forced reading a few values using portal remote control and then doing a set date and time on both with no effect, I did restart inverter on both (again through portal remote control. They have now been offline for 30 mins and 20 mins respectively, the wifi dongles are flashing around 1 flash per second. The wifi access point they use is working fine and connects through to internet OK (I have checked with my phone).
Anything else I can do to resuscitate them?

Now back online, but still refusing to charge.........

And at 8:20 this morning they both suddenly decided to work properly again, there is nothing in the portal remote control logs around this time, it appears to be all down to the inverters' software. Totally baffled and slightly concerned....