Anyone elses Sunsynk (or other inverter) getting ghost-disconnects?

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neoprema

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So no load shedding for a while now.

BUT, at least 3-4 times a day since the last week, I get a message from my Sunsynk that its disconnected from the grid. I check, its still connected. Then 5-10mins later I get a message saying its reconnected to the grid.

Not sure that is causing this...
 
neoprema said:
So no load shedding for a while now.

BUT, at least 3-4 times a day since the last week, I get a message from my Sunsynk that its disconnected from the grid. I check, its still connected. Then 5-10mins later I get a message saying its reconnected to the grid.

Not sure that is causing this...
Click to expand...
Maybe a variance in the incoming supply, voltage\frequency and outside the inverters parameters
 
Neuk_ said:
I am not getting that, have you checked your grid voltage and/or frequency for dips or unexpected values?
Click to expand...
Ok i used the app and zoomed in around the time the last message came in - the input voltage graph showed a big downward spike between 18h31 and 18h38

18h31:
V-AC-1: 233.2V
V-AC-2: 233.3V
V-AC-3: 233.6V

at 18h35:
V-AC-1: 219.9V
V-AC-2: 219.4V
V-AC-3: 219.5V

it seems at 18h35 it sent the grid disconnect message.

By 18h27, all were back up to 233 and higher.
 
neoprema said:
Ok i used the app and zoomed in around the time the last message came in - the input voltage graph showed a big downward spike between 18h31 and 18h38

18h31:
V-AC-1: 233.2V
V-AC-2: 233.3V
V-AC-3: 233.6V

at 18h35:
V-AC-1: 219.9V
V-AC-2: 219.4V
V-AC-3: 219.5V

it seems at 18h35 it sent the grid disconnect message.

By 18h27, all were back up to 233 and higher.
Click to expand...

That doesn't seem like a big enough voltage drop to warrant a disconnect but maybe there is something in your setup? Our grid voltage fluctuates as well, lowest today was 215V and highest 235V, no disconnects though...

1712944110413.png
 
Neuk_ said:
That doesn't seem like a big enough voltage drop to warrant a disconnect but maybe there is something in your setup? Our grid voltage fluctuates as well, lowest today was 215V and highest 235V, no disconnects though...

View attachment 1690409
Click to expand...
Do you if there's a setting for what is considered "low" voltage or "Eskom is gone" trigger? I assume its looking for 0 Watts down the Eskom feed though rather than just voltage drops.
 
neoprema said:
Do you if there's a setting for what is considered "low" voltage or "Eskom is gone" trigger? I assume its looking for 0 Watts down the Eskom feed though rather than just voltage drops.
Click to expand...
1712947259626.png
 
neoprema said:
Ok i used the app and zoomed in around the time the last message came in - the input voltage graph showed a big downward spike between 18h31 and 18h38

18h31:
V-AC-1: 233.2V
V-AC-2: 233.3V
V-AC-3: 233.6V

at 18h35:
V-AC-1: 219.9V
V-AC-2: 219.4V
V-AC-3: 219.5V

it seems at 18h35 it sent the grid disconnect message.

By 18h27, all were back up to 233 and higher.
Click to expand...
Solar assistant would be handy as it would show you much finer stats (few seconds) on the voltage data to monitor the drops, rather than the few minutes interval of the stock dongle.
 
I've had this 4 or 5 times on my Sunsynk. My grid voltage has been at ~252V since before I got solar so who knows.
 
neoprema said:
I assume this is on the unit? I'll have to check it in the garage tomorrow
Click to expand...
So I checked and its set like @RonSwanson screenshot, except the HIGH voltage says 285V.

It might still be dropping though, like someone said the interval on the dongle might not be fine enough to notice it.

I'm gonna try Solar Assistant. My Inverter came with a serial-to-usb thingie attached to it that I could use in the future they said if i wanted it monitored. I assume that can talk to Solar Assistant?
 
neoprema said:
So I checked and its set like @RonSwanson screenshot, except the HIGH voltage says 285V.

It might still be dropping though, like someone said the interval on the dongle might not be fine enough to notice it.

I'm gonna try Solar Assistant. My Inverter came with a serial-to-usb thingie attached to it that I could use in the future they said if i wanted it monitored. I assume that can talk to Solar Assistant?
Click to expand...
Pull the logs, they are updated and sent every minute.
 
RonSwanson said:
Pull the logs, they are updated and sent every minute.
Click to expand...
okay its something else. I noticed now something while watching it...

I was using 2985W of which 945W came from battery, and 2040 from Grid.

Suddenly it send the "Disconnect from Grid" alert.

My screen refreshed, and it was using 989W from battery and 2W from Grid...

But the Grid must have still been there because the non-essentials never got turned off.

20seconds later, it says "Connected to Grid"

and its now using 1986W of which 1902W is being used by the House, and 84W is being sent to the batteries...

then 10 seconds later, it stopped charging the batteries (they're at 65%) and is now just powering the house from Grid at 1951W...
 
Screenshot 2024-04-14 at 20.44.07.png
Where i drew the arrow, is the exact time just now that it told me the grid disconnected. Notice how input W also just fell off to 0 completely and then came back immediately.
 
neoprema said:
View attachment 1691105
Where i drew the arrow, is the exact time just now that it told me the grid disconnected. Notice how input W also just fell off to 0 completely and then came back immediately.
Click to expand...
You can see that better using the web app, go "Equipment" then "custom" and select parameters V-grid and F-Grid.
1713120609562.png
 
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