Unintentional

Hi, I'm running the BP units. Below settings sorted me out - no more F18 to date even with TONS of LS.

Hi, So after changing: Houses Inverters (Had 2 new ones, did the same) Every setting I thought was relevant I didn't win until I set my batteries to Voltage based control. Still have BMS in etc to control charge rates but now I'm 100% sorted. Not sure why that worked but give it a try.

Yeah, also thought it may be this but didn't help.

Hi, I'm not 100% sure but changing my BMS to voltage based install seems to have helped for SOME reason. What batteries are you using Waynesworld?

SunSynk 8kW E426 - MCU:6022-1724 New menus with a ton of new options under grid.

Very interesting - mine was only on down not up for loadshedding... in the meantime I had moved houses and the issue followed me so I'm still not 100% sure what the cause was here. I'll check that switch though just in case.

All the details are in the first post.

Yeah, unfortunately. The inverter I was struggling with on this issue is in for repairs with Sunsynk now so we'll see what they say... Weirdly mine was the other way around though - only ever through the F18 error when load shedding started.

Hi guys, Got a new inverter and my solar menu looks a bit different - same version as my previous 8kw so not sure if it's a hardware change. Have - Comm E424, MCU 6014.

Hi guys, So ended up replacing Inverter and reverting all changes - no more issues with load shedding if you come across this. I had a very old hardware revision of the 8kw sunsynk, I believe that's related but either way something went wrong with that device. Thanks all, Gareth

So yeah - the CT didn't fix it. Worked for 10+ load shedding sessions then started shutting off again. I subsequently turned my main Eskom power off permanently now to subvert the issue and everything has been 100% for the past 3 weeks. When it's cloudy etc for more than a day and batteries start running low I need to turn the power on again but that's like once in 3 months so just going to live with that. I think the inverter is faulty. Wish I could shed more light on this but I've done everything i can think of.

Hi guys, So an update here cause we've had 8 or so bouts of loadshedding with zero issues since I disconnected the CT coil. Very strange but maybe it was trying to energize part of the grid as speculated before. As all my load is on the essentials port, no loss at least. I'm thinking maybe the proximity of the CT to my inverter was part of the issue (super close). I'm updating here in any case in the event someone else picks up this issue. Thanks all,

Afternoon, So we just had load shedding again and immediately the inverter F18'd again. Had good solar at the time and around 2700W load. As always after about 2 mins it comes back and all is perfect again...

Hi all, So thanks to the suggestions here I checked my neutral voltage to earth with no grid - 105V... Also no protection with earth etc. An electrician has installed a neutral earth bond relay for me and that sorted that out. I've also removed the surge protectors around the house and found I had one faulty one, so may have also contributed. I'll advise once we have load shedding if we've resolved the F18 error, in case anyone else picks up this issue. Thanks!

Will do and update here, thanks!

Yeah, I had that initially but disabled when my BlueNova BMS kept crashing on an old version. BMS is stable now but that setting is still off.

For monitoring, Solar assistant is almost second by second on a RPi4 if you want to give that a try. Street side is locked but I'm sure I can make a plan there... I do not have a relay - I'll definitely speak to the electrician about that...

Hah, I'm sure the neighbours would LOVE me... 😁 So I tighted up the grid settings to see if it'd drop the grid more easily and not F18 - it was on standard settings before. If we are getting a spike through the grid my neighbour who also has the 8kw Sunsynk is not having the same issue. Perhaps it's an issue on the battery side? BMS reading incorrectly or something? Aux I do have my geyser on - but it's also run by a Sonoff and does not run at night at all...

Oh damn, not dropping with grid fluctuations on your end? Seen it happen here were grid side voltage goes down to 180V or so. Simulating the load shedding is the strange one - I've tried tripping the A/C about 20 times and it never throws an F18 so no clue what the difference is. I initially thought maybe my inverter was trying to supply grid side but subsequently changed inverter to Load Only to eliminate that possibility and still F18'd. Also my CT was wired and reading correctly so seemed unlikely. I don't know how the neutral is wired to be honest or if my machine is older or not - is there a way to check?

I'll do that, never thought of them until you mentioned. What sort of protector would you put upstream of the inverter as a matter of interest?

I do yes, on my fridge and PC.

Here are my settings if anyone sees anything that could explain this:

Yeah we feed back into the grid. The inverter mostly doesn't switch off, just over the past few months during load shedding. Just happened again so my firmware didn't sort it out. As it was 8PM I wasn't feeding anything back and the load was low as it usually is when it does an F18 over current. So I'm out of ideas at this point.

Agreed - the aux port was really buggy with activation so I put the sonoff to mitigate the weirdness, haven't had an issue since. Since the latest update - no more random power outages so I'm hoping that continues. CT seems to be reading correctly, see pic.