Anyone got a Deye 10kW inverter - thoughts and experience?

[Crossy]

The ferrite rings are a new thing, only my latest inverter came with them. They are supposed to reduce EM (electromagnetic) interference, I admit mine are still in the bag

 

What communication protocol is supported by your existing batteries??

[Sophon]

58 minutes ago, Crossy said:

The ferrite rings are a new thing, only my latest inverter came with them. They are supposed to reduce EM (electromagnetic) interference, I admit mine are still in the bag

 

What communication protocol is supported by your existing batteries??

 

I have no idea. I have two 280aH batteries connected in parallel without communication with the inverter, everything is controlled by voltage. One of my packs is a DIY job, while the other is the same Liyuan battery (with JK BMS) that you have.

 

If the Deye inverter doesn't work without communication established, can I just connect the communication cable between the inverter and the Liyuan battery pack?

[Crossy]

The Deye unit works just fine with no BMS comms, many people like to run "open-loop" like this because it give them "more control" over the charge parameters. Personally I run everything "closed-loop" (with comms) which allows the BMS(s) to control what the inverter does.

Each to his own.

 

I'm pretty sure the Deye will talk to the JK BMS (you will need to verify which protocols are supported by each). Note that our Liyuan boxes have Seplos BMS's

 

I was running for a while with several non-communicating packs in parallel with ones that communicated. It worked just fine in both open and closed loop.

 

[lom]

16 hours ago, Sophon said:

 

The incoming supply to the house is buried underground, so connecting the two earths would mean digging up the NYY cable and run a wire between the two earths. Not really something I want to do if I can avoid it.

 

With regards to the PV panel surge arresters, I was thinking of running each of the three strings through one of these so-called "combiner" boxes:

 

If I were to do that, what MCB amperage should I go for? My current panels have open circuit amperages of 8.79 to 10.12A, but I would like to have the flexibility to easily connect future panels with different specs (maybe even connect two strings in parallel). Would 25A be a reasonable compromise between safety and flexibility?

 

When open circuit there will be no current, the current will flow first when the MPPT draws current from the panels.

If you plan for connecting two strings in parallel in the future then use two of the single string boxes above and one 2-to-1 box. The combiner boxes has glass fuses, surge protectors and an MCB for each input string and the combine of two string into one is done on the output of the MCB so you can at any time disable one of the combined strings.

[lom]

16 hours ago, Sophon said:

I could optimize the production from each string. It would also free up space in my existing CU, as I would no longer need the MCBs to be in there.

Never mix DC and AC in the same CU...

[lom]

31 minutes ago, Sophon said:

If the Deye inverter doesn't work without communication established, can I just connect the communication cable between the inverter and the Liyuan battery pack?

Deye uses the Pylon protocol to speak with a master BMS over CAN and the masters uses RS-485/Modbus to speak with the slaves. I'm not sure if you can have one brand of BMS as Master and another brand as slave but if you use all your batteries as slave then Deye can speak with all of them over RS-485/Modbus and you will be able to see each battery's parameters/status in the Deye battery setup.

[Sophon]

11 minutes ago, lom said:

Never mix DC and AC in the same CU...

 

What is the reasoning for this?

[Sophon]

4 minutes ago, lom said:

Deye uses the Pylon protocol to speak with a master BMS over CAN and the masters uses RS-485/Modbus to speak with the slaves. I'm not sure if you can have one brand of BMS as Master and another brand as slave but if you use all your batteries as slave then Deye can speak with all of them over RS-485/Modbus and you will be able to see each battery's parameters/status in the Deye battery setup.

 

Because of the location I will not have the inverter connected to WIFI, so if I want to see data/status I have to physically go down to my equipment. So seeing the batteries parameters in the inverter doesn't really give me any benefit, I can just check the batteries directly.

 

There is one place in the house that I am able to pick up the bluetooth from my DIY battery pack, but not from my Liyuan pack.

 

 

[Sophon]

Does it matter if I set the inverter to "Zero Export To Load" or "Zero Export To CT"?

 

 

I don't have a backup load, or to be more precise my whole house is the backup load. So my wiring will be like this:

In both modes the inverter will provide power to the backup load, and will not export power to the grid. This is how I want it to work. However, I note that only under the "Zero Export To CT" mode does it say, that if PV and battery is insufficient to power the load, then the inverter will supplement with power from the grid. What happens under "Zero Export To Load" if my house draws more power than is available from PV + batteries?

[lom]

10 hours ago, Sophon said:

What happens under "Zero Export To Load" if my house draws more power than is available from PV + batteries?

You get supplemental power from the grid. Same as for "zero export to CT"

[Sophon]

11 hours ago, lom said:

You get supplemental power from the grid. Same as for "zero export to CT"

 

Thanks for the reply.

 

So for my setup, it doesn't really make any difference whether I select "Zero Export To Load" or "Zero Export To CT", other than I don't have to install the CT for the former setting?

 

Any advantages in selecting one setting over the other? Keep in mind, that for 80% of the year when the sun is plentiful, I plan to have the breaker open between grid and inverter (so I will in reality be off grid). I do this partly to provide a little added protection from lightning surges coming over the incoming lines, but also because I have learned from other threads, that the Deye inverter have some ghost import/export even when set to zero export. I want to avoid this as much as possible.

[lom]

17 minutes ago, Sophon said:

So for my setup, it doesn't really make any difference whether I select "Zero Export To Load" or "Zero Export To CT", other than I don't have to install the CT for the former setting?

Both settings do import from the grid when needed (grid-assist).

 

Load and Grid are electrically the same but can be divided into two zones with the CT's , before CT and after CT seen from the inverter.

Zero Export to Load doesn't export at all.

Zero Export to CT  exports to any device connected between CT and Load terminals (before CT zone) like for instance a high consuming EV charger that you don't want to be connected to the Backup/EPS terminals. The CT will in that case allow export to the before CT zone but will restrict export to the after CT zone.

 

 

 

23 minutes ago, Sophon said:

he Deye inverter have some ghost import/export even when set to zero export. I want to avoid this as much as possible.

 

I have only seen ghost import, no ghost export. Mine is just below 1KW/24h and it disappears when II isolate the system from the grid. 

[Sophon]

1 hour ago, lom said:

Both settings do import from the grid when needed (grid-assist).

 

Load and Grid are electrically the same but can be divided into two zones with the CT's , before CT and after CT seen from the inverter.

Zero Export to Load doesn't export at all.

Zero Export to CT  exports to any device connected between CT and Load terminals (before CT zone) like for instance a high consuming EV charger that you don't want to be connected to the Backup/EPS terminals. The CT will in that case allow export to the before CT zone but will restrict export to the after CT zone.

 

 

 

 

I have only seen ghost import, no ghost export. Mine is just below 1KW/24h and it disappears when II isolate the system from the grid. 

 

Thanks for the explanation.

 

I will have no load between inverter and the CT, in fact the nearest load is 50m from the inverter location so it would be way after the CT. Given that, I think I will go with the "Zero Export To Load" setting. I will probably install the CT even if it is not needed, just in case I change my mind in the future (or if I for some reason would want to run my meter backwards, in which case I believe the CT is necessary).