February 25, 20251 yr With the return of loadshedding my SunSynk has developed a new issue. Twice now, at the 12:10am mark when power came on in my area (after there had been 2-3 other load sheddings during the day, without issue) the inverter turned off entirely, the house went dark (no essential circuits, whole house on inverter) and about 1-2 seconds later the lights came back on. Again, it had dealt with 2 or more loadsheddings during the same day with at most a flicker of the lights to indicate the loss of grid power. Batteries were above 60% and load was maybe 1.5-2kw. There is nothing in the sunsynk apps logs about this. What makes it extra weird is that my 1kVa mecer office inverter, which sometimes beeps and kicks in for a second when grid power (via the sunsynk) drops or restores completely fails to catch this drop in power. So everything in my office also turns off for a second. It did not do this in the past. But I do have a weird issue with my MODBUS port that gives me whacky readings when using an ESPHome setup to read inverter variables for home assistant automations. The inverter had its comms board replaced to see if that fixes the issue but it did not. I suspect this has something to do with one of my batteries BMSs as readings go extra wonky if batteries are at minimum (15%). 4x Hubble AM2s. The only other item that's changed recently is I had the feed-in meter installed (3 phase, not active yet) and my installers had to remove my old prepaid meter and just joined the wires where the meter used to be, they're taped up so can't see what's keeping them together. Any advice or ideas would be appreciated!
February 25, 20251 yr 11 minutes ago, BobTheDinosaur said: With the return of loadshedding my SunSynk has developed a new issue. Twice now, at the 12:10am mark when power came on in my area (after there had been 2-3 other load sheddings during the day, without issue) the inverter turned off entirely, the house went dark (no essential circuits, whole house on inverter) and about 1-2 seconds later the lights came back on. Again, it had dealt with 2 or more loadsheddings during the same day with at most a flicker of the lights to indicate the loss of grid power. Batteries were above 60% and load was maybe 1.5-2kw. There is nothing in the sunsynk apps logs about this. What makes it extra weird is that my 1kVa mecer office inverter, which sometimes beeps and kicks in for a second when grid power (via the sunsynk) drops or restores completely fails to catch this drop in power. So everything in my office also turns off for a second. It did not do this in the past. But I do have a weird issue with my MODBUS port that gives me whacky readings when using an ESPHome setup to read inverter variables for home assistant automations. The inverter had its comms board replaced to see if that fixes the issue but it did not. I suspect this has something to do with one of my batteries BMSs as readings go extra wonky if batteries are at minimum (15%). 4x Hubble AM2s. The only other item that's changed recently is I had the feed-in meter installed (3 phase, not active yet) and my installers had to remove my old prepaid meter and just joined the wires where the meter used to be, they're taped up so can't see what's keeping them together. Any advice or ideas would be appreciated! Weird but one wonders why does the Mecer UPS not see that there was a drop in power and beep when restored as per your lights running from the main inverter. Have you looked at what the Sunsynk screen shows when you do a manual power off and then on via your input power MCB.
February 25, 20251 yr Author 8 hours ago, Scorp007 said: Weird but one wonders why does the Mecer UPS not see that there was a drop in power and beep when restored as per your lights running from the main inverter. Have you looked at what the Sunsynk screen shows when you do a manual power off and then on via your input power MCB. That's why I mentioned the UPS failure, this only happens when the inverter does this reboot. If I dropped the breaker on the whole house right now the UPS keeps my office running no problem. What is the input power MCB?
February 25, 20251 yr 3 hours ago, BobTheDinosaur said: That's why I mentioned the UPS failure, this only happens when the inverter does this reboot. If I dropped the breaker on the whole house right now the UPS keeps my office running no problem. What is the input power MCB? That is the circuit breaker that feeds AC to the Sunsynk. When the power is down to the Sunsynk there is normally a 1min time that is set under settings before it reconnect to the grid. . Having said this it should run from battery in this period. Edited February 25, 20251 yr by Scorp007
February 25, 20251 yr Author An update. My electrician/installer tells me this is happening to a variety of clients with the new bout of loadshedding and it's grid related, but can't explain it yet. Says the times it's happening is also the same.
February 25, 20251 yr 2 hours ago, BobTheDinosaur said: An update. My electrician/installer tells me this is happening to a variety of clients with the new bout of loadshedding and it's grid related, but can't explain it yet. Says the times it's happening is also the same. This must be a very specific issue to that specific Sunsynk 3 phase inverter, maybe a firmware issue? Friend of mine does mainly Deye and S/s - his words - "never heard or experienced this issue"
February 26, 20251 yr Does the inverter actually reboot, or is juat taking a while to switch to bat? Edit: had something similiar happen to me, and it was because the neutral of the grid, and neutral of the inverter, not being independent Edited February 26, 20251 yr by Pho3niX90
February 26, 20251 yr Author 1 hour ago, Pho3niX90 said: Does the inverter actually reboot, or is juat taking a while to switch to bat? Edit: had something similiar happen to me, and it was because the neutral of the grid, and neutral of the inverter, not being independent I couldn't tell you as I'm not by the inverter when this happens, but the house lights are off for about 1-2secs. I feel like a reboot takes longer than that? The inverter logs don't actually record a reboot either... I also suspected it might have something to do with the neutral. What would the correct way be to connect the neutral so that they are independent?
February 26, 20251 yr 24 minutes ago, BobTheDinosaur said: I couldn't tell you as I'm not by the inverter when this happens, but the house lights are off for about 1-2secs. I feel like a reboot takes longer than that? The inverter logs don't actually record a reboot either... I also suspected it might have something to do with the neutral. What would the correct way be to connect the neutral so that they are independent? I would be giving you incorrect information. Just showed the email from support to an electrician, and they sorted it out.
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