Hi All,

I have a Deye 8kw inverter. Can someone explain why and when island mode is selected on the sunsynk inverters and if the deye has a equivalent setting

According to the Deye manual - Section 5.10 - The Deye is the same as the SunSynk and has a "Signal Island Mode" setting

https://www.deyeinverter.com/deyeinverter/2021/02/06/502012021【b】储能单相说明书sun-3.6-5k-sg03lp1-eu-ver2.0-deye.pdf

As explained above, Signal Island Mode will activate a relay when grid power is lost.
The relay [Automatic-Transfer Switch (ATS)] is used to bond Neutral/Earth.

See Neutral Earth Bond information from SunSynk:
https://www.sunsynk.org/post/automatic-neutral-earth-bond
 

To make things really confusing, especially considering they are basically the same machine, the Deye manual states the ATS port makes 230V when grid is on and Ov when grid is off.  The Sunsynk manual and video states the exact opposite.  So when using a relay to bond earth and neutral when going into UPS mode, be careful to use the correct NO/or NC wiring for the relay depending on which machine you are using. 

Has anyone confirmed this difference between the machines?

To make things even more interesting the Deye manual recommends the following wiring setup for markets like Oz and RSA https://www.deyeinverter.com/deyeinverter/2021/02/06/502012021【b】储能单相说明书sun-3.6-5k-sg03lp1-eu-ver2.0-deye.pdf   Refer section 3.9.  Would this wiring make the grade to be SANS compliant?  

The older Sunsynk machines(mine included) have the inverter's internal load CT on the load output neutral wire.  Any neutrals shared between essentials and non-essentials in the DB caused havoc on the inverter's load reading in some cases. Apparently this has been changed on the later versions where they moved the CT to the live wire to eliminate any issues. I assume the same goes for the Deye machines.  Anyone have further insight into this?

 

 

 

On 2022/03/22 at 10:40 PM, Halcyon said:

the Deye manual states the ATS port makes 230V when grid is on and Ov when grid is off.  The Sunsynk manual and video states the exact opposite

The ATS on my Deye SUN-5K-SG03LP1-EU outputs 0 Vac when grid is on and 218Vac when grid is off just like the SunSynk. The line/phase voltage is however on the terminal marked N and not L. 

On 2022/03/22 at 10:40 PM, Halcyon said:

be careful to use the correct NO/or NC wiring for the relay depending on which machine you are using

I bought a 1P 16A 1NO+1NC 250Vac contactor for earth-neutral bonding and had to change the N & PE conductors from terminals R1/R2 to terminals 1/2 when I discovered ATS 240 was working in the opposite way. 

On 2022/03/22 at 9:40 PM, Halcyon said:

Would this wiring make the grade to be SANS compliant?  

 

 

 

 

Short answer:  No

On 2022/03/31 at 12:56 AM, Kilowatt Power said:

The ATS on my Deye SUN-5K-SG03LP1-EU outputs 0 Vac when grid is on and 218Vac when grid is off just like the SunSynk.

I should have mentioned that this behaviour is observed when "Signal ISLAND MODE" is checked. Unchecking it causes ATS to output 240Vac when grid is on.

Then there's a bug with the setting. If you check  "Signal ISLAND MODE" in Advanced Function Setup Menu, save and exit back to System Setup Menu, then select Grid Setup Menu, the "Signal ISLAND MODE" gets unchecked!

On 2022/05/05 at 10:31 PM, Kilowatt Power said:

I should have mentioned that this behaviour is observed when "Signal ISLAND MODE" is checked. Unchecking it causes ATS to output 240Vac when grid is on.

I observed the following on the ATS 240 pins of a Deye 8K.

If "Signal ISLAND MODE" is unchecked, then ATS 240 outputs 240Vac irrespective of whether the grid is ON or OFF. Only when "Signal ISLAND MODE" is checked will ATS 240 output 0Vac (zero volts AC) when grid is ON. The truth table is below.

Deye 8K ATS 240 Truth Table
Grid	Signal ISLAND MODE	ATS 240
0	0	1
0	1	1
1	0	1
1	1	0

 

Hi all, 
I recently installed a 5K DEYE Inverter and learn’t you can feed excess solar power back into the grid. I then heard you shouldn't do that because it could harm people working on electrical infrastructure (Eskom guys). I then heard if your inverter has an "islanding" feature then it should be fine. My DEYE inverter has the “Single Island Mode” option.

Some googling landed me on this forum.

So my question is, if I want to feed back into the grid, without harming people, do I have to enable the Single Island Mode?

Thanks.

18 minutes ago, RealNeil said:

Hi all, 
I recently installed a 5K DEYE Inverter and learn’t you can feed excess solar power back into the grid. I then heard you shouldn't do that because it could harm people working on electrical infrastructure (Eskom guys). I then heard if your inverter has an "islanding" feature then it should be fine. My DEYE inverter has the “Single Island Mode” option.

Some googling landed me on this forum.

So my question is, if I want to feed back into the grid, without harming people, do I have to enable the Single Island Mode?

Thanks.

You should never feed back into the grid without prior authorisation/registration/certification with your local municipality or Eskom. It's just not legal. Even if your inverter is capable. They will give you a new power meter because if you have the wrong prepaid meter it can even cost you money for every bit of power you are giving away.

The Deye inverter has got anti-islanding protection built in. Any inverter that has a grid-tie function has to be, in order to comply with code/regulations. It just means that the moment the grid is off, the inverter will no longer export any power into the grid, it will automatically immediately shut off the non-essential supply and stop any exporting the moment it picks up that Eskom is down.

In that way nobody gets hurt who is working on the power lines while Eskom is off. It works different than if you've say got a generator that you hook up to the grid while Eskom is off, there you could hurt people and be in trouble.

But the Deye never can do that. You don't even have to set anything special up as long as the inverter is installed correctly.

What you call "Single Island Mode" is actually "SIGNAL Island Mode" which is to activate a relay for a function that is different to what you are asking right now.

I have a hybrid system (3 deye inverters connected to a battery bank and connected to the grid). On the load, i have a tesla charger. When the grid (or main) is on, the tesla charger works seamlessly although it is getting the power from the PV and/or batteries. However, when i cut the main power (or grid), the tesla charger returns an error and stops charging. 

I wonder if this "Signal Island Mode" can solve the issue. Any clue? 

 

11 hours ago, Frankista said:

I have a hybrid system (3 deye inverters connected to a battery bank and connected to the grid). On the load, i have a tesla charger. When the grid (or main) is on, the tesla charger works seamlessly although it is getting the power from the PV and/or batteries. However, when i cut the main power (or grid), the tesla charger returns an error and stops charging. 

I wonder if this "Signal Island Mode" can solve the issue. Any clue? 

 

My guess would be that your Earth/Neutral are not bonded when you disconnect from the grid. 

 

"Signal Island Mode" is used to earth bond your inverter when Grid is not available.

When you lose your grid. You lose the earth connection on Municipal side.

Get a qualified electrician to sort this out.

On 2023/07/20 at 12:12 PM, Sc00bs said:

My guess would be that your Earth/Neutral are not bonded when you disconnect from the grid. 

 

Could be the case. Very dangerous

Earth leakage tester will point this out to you.

Edited November 10, 2025Nov 10 by HowTo