I suppose it is not unheard of, but then apart from settings being incorrect presents the only reasonable explanation.
You never did say how new your Multis are. How long has the setup been installed and running? And did this issue happen from the start?
OK experts, who changed what? After restarting the system everything seems to be working perfectly. Here is me hoping that the problem does not return.
Yesterday whilst on there, I wanted to reboot it all … Windows XP habit.
Inverters, Cerbo, everything I can do remotely.
Then I thought what happens if no-one is home, and the house goes dead.
Or worse, does not come back online …
So I did not do that.
… and promptly forgot to suggest that as an option.
The only reason I switched off was to check all connections and cabling. Not a fan of being shocked. I know my limitations. I am still hoping that someone found a incorrect setting. It will give me peace of mind. Now I still do not know what went wrong.
Sometimes a reboot is the solution to a software problem issue.
… and sometimes, rebooting, brings out the hardware issue.
Mmmmh. So you guys thing that measurement was incorrect? Could be… but that’s a bug I have never seen before!
System still performing perfectly. Guesswork from me:
1: Somehow something in Multiplus 1 was stuck and reset with cold reboot.
2: Something in BMS of one of the batteries reset with reboot.
3: I inadvertently touched or tightened something causing better connection. Even though I could not find any loose connections.
4: One of the circuit breakers malfunctioned and with switching was fixed somehow.
5: Someone changed a critical setting.
6: One of the fuses did not make good contact before.
7: The %$! tokkelosie
In order of likelihood, and assuming you have no actual fuses in the AC lines, I’d say 3, then 4, then 1, and then maybe 7. The rest are unlikely to have anything to do with it 
Edit: Ideally we should have had an opportunity to shove a clamp meter on the individual AC lines to check if what the Multi reported was real. That could have ruled out option 1.
Whatever was fixed or changed, it worked. This is the first time the system is working perfectly according to me.
Happiness!
Panels are pumping!!
Doing very well indeed! I wish I could get as close to my theoretical limit as you do.
I have two 48/3000 Multiplus’s in parallell and will soon be adding a third. I often see funny things starting to happen. I’ve learned the first thing to do is to reboot everything, inverters, MPPT’s, GX device, Smartshunt, etc. This have solved any gremlins 100% of the time. I normally take that time to sommer check all connections as well. I do this at least every 3 months. I’ve had the 2 48/3000’s keeping up with a 6400w demand for around 30 seconds. They’ve amazed me quite a few times. Only problem I have in summertime in the Karoo is that thet tend to overheat and shut down on very hot days with heavy loads like the geyser being on from noon daily. They’re currently installed in my bedroom, next to the DB but I’ll be moving them outside soon seeing that I haven’t got enough room for the 3rd one. They will then be mounted in a small room, 1.3m x 3m, which was built to house a generator. I’ve sold the generator so the room is vacant, perfect for the installation. Seeing that there’s already good ventilation and extraction fans (to keep the generator cool) I’m sure the overheating issue will then be solved. Also with the third unit helping to distribute the load… Also a lot more room for batteries then. Still in 2 minds about the eTowers. They seem to behave themselves now but I don’t trust them anymore and would like to start from scratch
I had a 3kva, sold it, upgraded to a 5kva due to the temp limitation. 5kva solved my problem.
Saw the MPPTs running really hot, I literally added a fan underneath the inverter and MPPT’s to make some air move.
4.2kw on the 250/85 and 1.05kw on the 150/35, not the best day yesterday but exceeding the theoretical limit happens most of the time on good sunny days … hence the temp issue for me.
On cold sunny days, combined, I have seen 6.7kw spikes.
Panels are Canadians, they do preform.
4mm wires, yeah a LOT of wires.
Like in 3 strings down for the 12 panel array and 1 string for the 150/35 array down to the combiner box.
My theoretical limit is 7150 Watt. I peak at just over 6000 Watt on cold days.
But I suspect I don’t come close to that because I am on the conservative side when it comes to maxing out the MPPT’s.
Panels are wired to give just over 100 Volts so still very far from the 150 Volt limit.
Peaked today @ 8800w on (8000w array) - Battery was full @ 10:30 so ran out of space.
Wow that is great!
Maybe in a year’s time, after having studied the data I will put 3 panels in serie to get closer to mppt limit. I suspect this is where my issue is.
