Sunsynk (DEYE) Hybrid Inverters

tnegun

https://www.boards.ie/discussion/comment/123318285#Comment_123318285

Same I think saw where the name is configured in the addon options, I was thinking of the JK-BMS config. It can get quite confusing with the zero export options too 🤯

https://www.boards.ie/discussion/comment/123318286#Comment_123318286

Yeah sorry no Deye!

Abromavich

System is up and running. Battery is not set up yet. System is outputting solar to the grid.

Cant get the Deye to communicate properly with the Eastron SDM 230. Ive tried different cable combos, Interestingly I got the below alarm when I connected white/Blue and orange to terminal 5 & 6 on the eastron:

Heres an image of the RJ 45 that connects to the Deye:

Edit:

Just realised I think the GND wire (No. 6) needs to be connected to terminal 7 on the Eastron:

tnegun

What port are you plugging the meter into?

Abromavich

https://www.boards.ie/discussion/comment/123321366#Comment_123321366

The meter port on the Deye.

Just realised I think the GND wire (No. 6) needs to be connected to terminal 7 on the Eastron:

graememk

https://www.boards.ie/discussion/comment/123321374#Comment_123321374

The "5&6" is the numbers for the ports on the meter.

What is your model number and what does the manual for that model say?

Looking at a random model it seems that on the RJ45, pin 4 is rs485B and pin 5 is rs485B

So 5 on the meter should go to pin 5 on the RJ45

6 on the meter should go to 4 on the RJ45

(And I'd recrimp it to a standard)

B is the most commonly used one.

Abromavich

Its a Deye 12kW, model: SUN-12K-SG02LP1-EU-AM3

Ok - so recrimp to standard T568B. Pin 5 (A - blue/white) to 5 on meter and Pin 4 (B - blue) to 6 on meter. Then Pin 6 (GND_2 - Green) to 7 on meter?

graememk

https://www.boards.ie/discussion/comment/123321969#Comment_123321969

Yep I'd try that.

Abromavich

https://www.boards.ie/discussion/comment/123322035#Comment_123322035

Thanks a mil!

SD_DRACULA

https://www.boards.ie/discussion/comment/123321374#Comment_123321374

Pretty sure I don't connect GND and it works fine without it, on SDM230

insular1

The inverter has been running perfectly the last couple of days wired directly to CT with no meter it has been giving a constant discharge back to the grid of around 100w which I'm happy with.

Before diving into HA I have started messing around with discharging back to the grid via the Deye cloud app and am noticing a strange issue.

I normally have the system work mode set to "Zero export to CT" and all works well. In the Deye cloud app it shows the Grid being zero and the house load is usually reading slightly less than the battery output as I'd expect.

The issue comes when I try to discharge some excess battery back to the grid. I set the work mode to "Grid Selling First" and have the max sell power set to 5800w. The inverter starts to discharge the batteries at 5800w but it seems to assume all this is going to the grid so it reads the house load as zero and 5800w going to grid, like it's disregarding the CT reading or something. I have a Zappi set up which I trust the accuracy of and it's showing approx 3kw house load and 2.8kw going to grid. The Deye thinks 5.8 is going to the grid so isn't increasing its output.

Any ideas what this could be?

graememk

https://www.boards.ie/discussion/comment/123327574#Comment_123327574

When you tap the grid icon on the deye, it brings up a menu, it should show what the deye is reading from the CT.

But yes when in solar sell, the deye just outputs the max power set, in your case 5800.

Another thing to check is your CT ratio., is that correct?

Would the house be using 3kW, or is there another immersion diverter running somewhere

insular1

Ah thanks for that. I see when grid selling first is selected and I click the grid icon the CT reading and load reading are accurate, just confused me as on the main screen it shows the load as zero and the all the discharge going to the grid.

insular1

Another thing I just noticed is it never seems to send the full solar production to the battery. I don't really mind this as want to prioritize export anyway but wondering if there is a setting I have wrong?

Screenshot_2025-04-05-09-31-33-372_com.deyesolar.jpg

JohnySwan

https://www.boards.ie/discussion/comment/123328459#Comment_123328459

Is that from an app? Take a photo of the inverter screen.

insular1

Yeah that's from the Deye cloud app. Inverter screen shows the same thing but the app is only updated every 5 minutes. I'm wondering is it because I have a small separate solar set up with microinverters and its allowing the energy from them to go back to the grid?

insular1

After watching it for the past hour or so that does seem to be what's happening. It's letting all the production from the micro inverter set up go straight to the grid rather than charging the battery. This suits me for the moment with export being so profitable and I presume in the future if I wanted to change this I'd just have to wire the microinverters through the Gen port on the Deye?

JohnySwan

https://www.boards.ie/discussion/comment/123328504#Comment_123328504

Unless you have set your inverter up to charge the batteries from the micros, then any production from the micros will just be exported. You can tick a box in the auxiliary load settings menu to do this.

graememk

https://www.boards.ie/discussion/comment/123328504#Comment_123328504

In the generator setting there is a AC couple or something, tick that box

SD_DRACULA

https://www.boards.ie/discussion/comment/123320989#Comment_123320989

A Phase must be ticked on single phase (it's not in your pics), not sure it will make a difference.

Version of the SDM230 will matter as well as there are quite a few.

This is mine: https://www.amazon.co.uk/dp/B08XJS1SBC?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1

You want SDM230-MODBUS-MID V2

SD_DRACULA

I have a weird issue.

Rebooted the inverter and the backup socket has no power.

I see 230v at the load terminals. Is there a setting somewhere on the inverter to enable it?

graememk

https://www.boards.ie/discussion/comment/123330084#Comment_123330084

If you have voltage, you should have power. Something inbetween might have tripped/fused?

(as the Grid, Load, and Gen all share the same busbar internally, Load is connected to the grid when its on grid)

SD_DRACULA

https://www.boards.ie/discussion/comment/123330128#Comment_123330128

Yes my brain was in between, forgot I put a shelly on that socket so it's off when you power it back on 🤦‍♂️

Abromavich

https://www.boards.ie/discussion/comment/123329069#Comment_123329069

Thanks a mil guys. Yep my Eastron is identical. Recrimping as per Graememk suggestion and changing the workmode to 'Zero export to CT' fixed the issue. Ticking 'A phase' on/off makes no apparent difference but I left it on as per your suggestion.

Anyone know what 'MPPT Multi-Point Scanning' does? Is it worth enabling? Also does 'low noise mode' alter fan speed or something else?

SD_DRACULA

https://www.boards.ie/discussion/comment/123337623#Comment_123337623

Nice one.

I left multi point scanning enabled as with it disabled, it seems to draw in less but I haven't left off long enough to test that.

Abromavich

https://www.boards.ie/discussion/comment/123338361#Comment_123338361

Interesting, wonder if anyone here has tested it?

I asked Gemini and this is what it says (this could be totally unreliable info!):

3. What is MPPT Multi-Point Scanning (on Deye Inverters)?

• MPPT Multi-Point Scanning (often also called Global MPPT Scan, Shade Scan, or similar terms by different manufacturers) is an advanced MPPT algorithm specifically designed to overcome the problem of partial shading.  
• Instead of just tracking the nearest power peak, the Deye inverter periodically performs a wider sweep or scan across a large portion of the solar array's possible operating voltage range.
• During this scan, it measures the power output at many different points along the curve.
• It identifies all the power peaks (the LMPPs and the potential GMPP).
• It then compares these peaks and intelligently selects the operating point corresponding to the true Global Maximum Power Point (GMPP).
• Once the GMPP is found, the inverter operates the array at that point until the next scan or a significant change in conditions triggers a new scan.

In essence, Deye's MPPT Multi-Point Scanning:

• Detects conditions likely caused by partial shading.
• Scans the entire relevant voltage range to map out the power curve.
• Identifies multiple power peaks (LMPPs and the GMPP).
• Locks onto the highest peak (GMPP) to maximize energy harvest.

Benefits:

• Increased Energy Yield: Significantly boosts energy production in partially shaded conditions compared to standard MPPT.  
• Improved System Performance: Makes the solar installation more effective even when conditions are not ideal.  
• Better ROI: Maximizing energy harvest improves the financial return on the solar investment.  

When is it important?

This feature is particularly crucial for installations where partial shading is unavoidable at certain times of the day or year due to surrounding objects or complex roof structures. Deye hybrid inverters equipped with this feature offer a distinct advantage in such scenarios.  

Sources and related content

JohnySwan

https://www.boards.ie/discussion/comment/123337623#Comment_123337623

Low noise mode reduces electronic noise.

Low Noise Mode - sometimes other electrical products in the house can interfer with the inverter and cause a high pitched noise to be heard. this function switches the switching frequency to a frequency outside the audible hearing range

Abromavich

https://www.boards.ie/discussion/comment/123338698#Comment_123338698

This is interesting. I installed the Deye into the shed at the back of the garden so its a good distance from the house (and other electrical appliances). I turned off 'low noise mode' today and could have sworn that the electrical noise was actually less after turning it off. With low noise mode on, there is a clear high pitch audible noise, nothing bad but its there. After turning it off, its there but quite difficult to percieve.

My worry was low noise mode was more to do with throttling the fans to limit noise and hence potentially throttle inverter performace.

Abromavich

I've identified a very annoying problem. Im using all 3 MPPTs on the Deye inverter like so:

One of the MPPTs (PV1 below) is used for a recently installed north facing system (12 x 435W), split over 2 strings.

Another MPPT (PV3) is for recently installed panels on the shed E / W config with optimisers (6 x 435W) on a single string.

The remaining MPPT (PV2) is used for my exisiting S facing 6kW system (15 x 400W) split over 2 strings (10 panels on one string and 5 on the other).

I notice the peak output of the 6kW S facing MPPT (PV2) is maxing out at 3.1 - 3.2kW. The voltage reported by the inverter is extremely low at 137V for this MPPT (PV2). I measured the open circuit voltage of the 2 strings and they are 340V (10 panels) and 171V (5 panels). Am I correct in thinking that when paralling strings on a single MPPT, the strings need to be split equally? I disconnected the 171V string expecting the single string of 10 panels (340V) to output a higher power compared to both connected but instead it dropped down to below 1.5kW. Any thoughts?

graememk

https://www.boards.ie/discussion/comment/123342720#Comment_123342720

Yes parallel strings on the same mppt have to have the same panels, and same number of panels.

It's to do with the maximum power point of the panels, (eg the voltage that will give the most power)

With mixed panels on the parallel string it would change the apparent maximum power point of the panels to the inverter, thus reducing the power output.

I wonder how shading would effect the parallel string. As hard shadows would activate bypass diodes, taking that panel out of the equation, and then shifting the mppt voltage on one of the strings

SD_DRACULA

https://www.boards.ie/discussion/comment/123342919#Comment_123342919

Yes you need same panels split equally, I have 8kwp on PV1 split into two 12 panel strings and one gets shaded for the bad months but does not affect the unshaded one.