I wonder if there are more differences between the older and newer inverters or if your old ones were thought to be faulty. I like the newer wiring terminals, I managed to break one of the older style connectors. Glad to hear you haven't had any issues, please update if you do!
Excellent news @vanblokland. Hope everything goes well. Do you know what caused the original failures? Please LMK (PM if preferred).
I have mixed versions, the only difference noted is the metallic tape above the AC input/output and the wiring order was changed.
Never were able to identify, that was why they replaced inverters.
So before you had 2 separate 3S strings correct? What was the Voc for each array?
Correct, each panel is 49.8volts stc rating and 46.5volts nmot. I attached a screenshot of what the total per array was trending at before I made the changes. It would peak around 130volts.
from SS:
I have been running for a few days now on my EG4 6500 install, all factory NG bonding entact (I have given up on this for now and trust the designers know what they are doing). The first configuration was 4 inverters on split phase and yesterday switched over to six inverters. Yesterday was very overcast and most inverters were around 90V or less and putting out 15w to 115w. Inv 5 I have two strings of 7 in parallel into PV1 and that is performing 3x or more output than my single strings of 8, with 265V (out of 265) and 235w. The only flicker I get on battery mode with 4 inverters is when making shakes with our Ninja. Every time I pulse the power every light (both LED and incandescent show a voltage drop). I haven’t done this yet on battery with 6 inverters.
I think it is nuts that a circuit card assembly must be removed to access the NG bond screw. I am surprised that SS is authorizing this. Something seems wrong with the overall concept of NG bonding and needs to be redesigned to handle various configurations. I am running 6 inverters with NG bond in load panel only. No issues observed so far.
120V, I may adjust upwards as my main 4/0 distribution is 150’
I'm ok with the risk, but a good note to those that are not
About a month ago I was using the solar assistant simulated BMS. One morning I couldn't get my system to go to SBU mode even though the app was showing the batteries at 30%. I opened my battery cabinet to find both batteries shutdown due to low voltage, when I turned off the simulated BMS in solar assistant the batteries displayed 0% charge. (Luckily the internal battery protection isolated them). So while both batteries were off, the inverters we're able to run in bypass mode. Last week I was flashing the firmware in my batteries and I was trying to not shut down the inverters (simulate what had happened when both batteries were at 0%). I assumed when I turned off my DC breakers the inverters would go to bypass. I have 2, 200 amp breakers on the positive leg to each inverter. When I opened one of the breakers, the inverter it was connected to displayed an F80 fault and shut down all output from both inverters. I did not expect this, by disconnecting a positive from one inverter, the system faulted and shutdown. I don't know if it was due to the negative leg still being connected or if it was because one inverter was still hooked up to the battery. Going forward I will only disconnect batteries by opening the breaker on the batteries themselves if I want to keep the inverters running. I found the F80 fault a strange error given the conditions. I suppose moral of the story is, if you have an F80 fault, check your DC to the inverters (connections, breakers, crimps etc). I don't care to force the system into fault conditions so I don't think I'll try to replicate this one.
How did you disconnect your batteries? I think I did have them in eg4 mode the time I received the F80 fault
When I close my CB to any inverter, it shuts down abruptly, this can then trigger an unbalanced load causing all others to turn off. Definitely don’t want to do that. Turn power off at inverter and only flip battery bus CB to inverter when inverter display shows it is off.
I think @PreppenWolf is right. I wonder if it has something to do with using EG4 Comms to the inverters. I don't know if disconnecting a breaker in an EG4 battery interrupts the communication flow between packs. Seems kinda silly if it does though.
Since then I have hooked the batteries to solar assistant and I'm running in USE mode. I don't really want to initiate a fault condition to test it though
