I have a Sunsynk 8kw inverter, with batteries and PV. This morning there was some cloud cover and I saw the batteries were close to the shutdown level and we were halfway through a 4 hour load shedding. I switched on the generator connected to the AUX/GET port. It is a 7KVA generator, but the invertor is set up to draw a max of 4kw from it and use a max of 20A for battery charge. This setup has been working well for almost a year. 

I could hear the system drawing power from the generator for a short while and it was indicated on the inverter LCD, but then stopped. It looks like the batteries reached their shutdown level and the inverter shut down. Now I cannot get the inverter to start again. Grid, PV, batteries and generator on or any combination of them. I've restarted the entire system several times. The only thing that comes on is the LCD on the inverter. All 4 indicator LEDs above it is dead. Top left status alternates between a green "OFF" and a red "COMM".

The panel is operational and even shows the battery status in the settings, but it loses all config when you shut down the inverter, so I think comms with the actual inverter is broken. 

Screenshot attached. I think something blew inside, but perhaps someone has an idea of how to troubleshoot?

5 hours ago, Pierre-Andre said:

I have a Sunsynk 8kw inverter, with batteries and PV. This morning there was some cloud cover and I saw the batteries were close to the shutdown level and we were halfway through a 4 hour load shedding. I switched on the generator connected to the AUX/GET port. It is a 7KVA generator, but the invertor is set up to draw a max of 4kw from it and use a max of 20A for battery charge. This setup has been working well for almost a year. 

I could hear the system drawing power from the generator for a short while and it was indicated on the inverter LCD, but then stopped. It looks like the batteries reached their shutdown level and the inverter shut down. Now I cannot get the inverter to start again. Grid, PV, batteries and generator on or any combination of them. I've restarted the entire system several times. The only thing that comes on is the LCD on the inverter. All 4 indicator LEDs above it is dead. Top left status alternates between a green "OFF" and a red "COMM".

The panel is operational and even shows the battery status in the settings, but it loses all config when you shut down the inverter, so I think comms with the actual inverter is broken. 

Screenshot attached. I think something blew inside, but perhaps someone has an idea of how to troubleshoot?

Try ticking activate in the battery settings. However even with just grid on the inverter should show AC. 

Do you see an error logs?

I did try activating the battery. Nothing happens. Also, no error logs. 

It looks like the lcd unit get valid battery info from the BMS, but cannot access the rest of the inverter. 

Do you have any graphs of what was happening before and after you switched on the Gen.. AC input/AC input voltage?

Hi @Pierre-Andre

Try shut everything off - all breakers, batteries and inverter completely for 3-5mins. Run the house on Eskom (which im assuming you're doing already) . The follow this restart procedure step by step noting to wait for each light confirmation:

Edit:
Shutdown process:

1. Flip the Change Over Switch to Grid (To power the house from the Grid and bypass the system)
2. Flip the Inverter breakers Off in the DB Combiner Box
3. Flip the PV (DC) Isolator on each Inverter Off
4. Press the On/Off button on the Inverter to turn Off (Takes about 60-90sec for the inverter to turn off completely)
5. Flip the breaker/s on the battery to Off

System is now shutdown and safe to work on.

Startup process:

1. Flip the battery breaker/s to On
2. Flip the Inverter breakers on DB Combiner Box to On
3. Press the On/Off button on the Inverter to turn On
4. Flip the PV (DC) Isolator on each Inverter On
(WAIT for the system to startup and Normalize, at this point you will see the DC(if during the day and you have panels) and AC lights. The NORMAL light can take 60-120sec to illuminate you will hear the relays when this happens.)
5. Once you see the NORMAL light you can now flip the Change Over Switch to Inverter for the system to pick up the load.

 

 

Similar thing happened to me after the snow the other day, flat batteries switched off the Sunsynk and Swambo could not get it going again.

I went home and followed the shutdown procedure as stated above by @mzezman, but before I switched off, I set the "Battery Shutdown", "Low Bat" and "Restart" to the lowest settings they could go to. I think it was 0,10,10. When i switched back on all was normal again. 

Very interesting.  Might have to develop a standard operating procedure of manually switching off in such extreme cases before the system shuts down automatically. 

2 hours ago, AndrewJdc said:

Very interesting.  Might have to develop a standard operating procedure of manually switching off in such extreme cases before the system shuts down automatically. 

indeed. this is the most common thing i have pickup on sunsynk/deye on facebook

Edited July 16, 20233 yr by Magetsi

Just do not allow the batteries to reach the shut down stage. Monitor the battery SOC during load shedding to prevent potential permanent damage to those expensive batteries.

29 minutes ago, Pumba said:

Just do not allow the batteries to reach the shut down stage. Monitor the battery SOC during load shedding to prevent potential permanent damage to those expensive batteries.

That is the exact purpose of the shutdown setting, so you don't have to worry and monitor anything manually. The inverter shuts down the battery before damage can occur.

51 minutes ago, PowerUser said:

That is the exact purpose of the shutdown setting, so you don't have to worry and monitor anything manually. The inverter shuts down the battery before damage can occur.

Judging by the number of complaints/faults raised by user base, it feels like this can be improved by SunSynk. The inverter should provide visuals pointing towards the requirement to execute shutdown.  As it stands looks like the system is broken when it only needs proper shutdown and powering up

1 hour ago, Magetsi said:

Judging by the number of complaints/faults raised by user base, it feels like this can be improved by SunSynk. The inverter should provide visuals pointing towards the requirement to execute shutdown.  As it stands looks like the system is broken when it only needs proper shutdown and powering up

The system needs to configured according to the battery specifications. That’s why if not sure, get a reputable installer to assist you. 

On 2023/07/16 at 10:04 PM, PowerUser said:

The system needs to configured according to the battery specifications. That’s why if not sure, get a reputable installer to assist you. 

I beg to differ. Sunsynk cannot create a user product without all proper instructions and make them along the way expect everyone to be up to date. Sunsynks reputable installer became reputable by breaking someone else's inverter. This is not a case of being unsure. This is just shoddy by Sunsynk

37 minutes ago, Magetsi said:

I beg to differ. Sunsynk cannot create a user product without all proper instructions and make them along the way expect everyone to be up to date. Sunsynks reputable installer became reputable by breaking someone else's inverter. This is not a case of being unsure. This is just shoddy by Sunsynk

Well, you can take this up with SunSynk and provide us with feedback on their view. 

I had the same problem. Switched of the system and when switching back on again, th "normal" light does not come on. Tried switching off amd on several times but no luck. The system does not switch on

 

Sun Synk is a piece of junk. That's all I can say. Ever since the unit was installed there gas been endless issues.  The power on the grid is off nothing new in South Africa  these days,  the sun synk unit is completely dead as well.  The unit has only been installed for 1 year 6 months.  Now the idea was to get solar to move 80 off the grid. It seems like now I need to get a backup for the solar system.  I guess one needs to look at where goods are manufactured if you want quality and reliability.  And today's lesson is either you buy Japanese or European products.  Chinese cheap and just junk. 

On 2024/11/16 at 4:48 AM, AnilHarry said:

Sun Synk is a piece of junk. That's all I can say. Ever since the unit was installed there gas been endless issues.  The power on the grid is off nothing new in South Africa  these days,  the sun synk unit is completely dead as well.  The unit has only been installed for 1 year 6 months.  Now the idea was to get solar to move 80 off the grid. It seems like now I need to get a backup for the solar system.  I guess one needs to look at where goods are manufactured if you want quality and reliability.  And today's lesson is either you buy Japanese or European products.  Chinese cheap and just junk. 

 

If it fails to turn on completely normally the problem lies elsewhere (issues with batteries or undersising of batery bank) unless it was seriously damaged (by say lightning)

In most cases, if the inverter is really damanged (damaged PC boards by example) the inverter will still turn on, but won't feed the load.

Even if the MPPTs fail due to user error (overvoltage) the inverter normally remains on.  Other commen reasons is AC overcurrent or DC overcurrent, again these are mostly due to undersising of the system compared to expectations that often causes hardware damage, but the inveter would normally shut down (as intended to protect itself) when this occurs but will turn on again. If hardware damage occurred if will not service the load.

What does the error logs say?

What are the details of the system and batteries?

 

 

Brand new 8kW sunsynck inverter installed, on the led screen, only AC light is on. The normal light doesn't come on. Powered down and up for several times. Still doesn't want to power load. 

No fault on the fault list, really frustrating. Installed a similar drive before, a Deye. Never had any problem. Could this be a factory fault.🤨

On 2024/12/22 at 6:02 AM, senzo101 said:

Brand new 8kW sunsynck inverter installed, on the led screen, only AC light is on. The normal light doesn't come on. Powered down and up for several times. Still doesn't want to power load. 

No fault on the fault list, really frustrating. Installed a similar drive before, a Deye. Never had any problem. Could this be a factory fault.🤨

Just checking.....did you switch toggle switch on AND push button.

On 2023/07/15 at 7:59 PM, Pierre-Andre said:

I have a Sunsynk 8kw inverter, with batteries and PV. This morning there was some cloud cover and I saw the batteries were close to the shutdown level and we were halfway through a 4 hour load shedding. I switched on the generator connected to the AUX/GET port. It is a 7KVA generator, but the invertor is set up to draw a max of 4kw from it and use a max of 20A for battery charge. This setup has been working well for almost a year. 

I could hear the system drawing power from the generator for a short while and it was indicated on the inverter LCD, but then stopped. It looks like the batteries reached their shutdown level and the inverter shut down. Now I cannot get the inverter to start again. Grid, PV, batteries and generator on or any combination of them. I've restarted the entire system several times. The only thing that comes on is the LCD on the inverter. All 4 indicator LEDs above it is dead. Top left status alternates between a green "OFF" and a red "COMM".

The panel is operational and even shows the battery status in the settings, but it loses all config when you shut down the inverter, so I think comms with the actual inverter is broken. 

Screenshot attached. I think something blew inside, but perhaps someone has an idea of how to troubleshoot?

Controller card issue