Hi,

1x Deye 5KW with 2x Dyness 5kw batteries...(200Ah / 10kw total)

As I am getting used to the system interface of the Deye inverter, I am doing general system checks to verify the setup/make sure everything is working as it should.

One or two things are not really matching what the Deye manual states.

 

In my battery settings, I have the following (I am happy with 0.2C charge and 0.35C discharge setting):

(I have since de-activated the "activate battery" toggle")

Lithium Mode:

 

When I click on the battery picture on the inverter, I see the BMS settings. This is displayed in the image below:

(busy charging from grid, just after load shedding...so I assume its correct as 40A of 200Ah is 0.2C... so 0.2 of 10KW is 2000W, and this is the rate it is charging at as Power is -2024W?) (or said otherwise 37,24x54=2024W ... 37.24A is about 0.2C)

 

I then click on the Li-BMS button and get this image below, and this is where my questions start...

 

 

So, questions relating to the screen above:

1) In the Batt Settings I have max charge as 40A, and this is showing here as 40A. But my max discharge in Batt Settings is 70A, and here it shows 50A? Why is this? These 40A/50A values in the image above, is this relating to my total bank of 2 batteries?

2) It says battery current 19A - so to me it seems as if this is the BMS values for only one of my two batteries?

3) how can I see my individual battery settings and temperatures etc for each of my two batteries? It almost appears as if my BMS inverter screen is only relating/showing values from one battery? or what am I missing here?? Where can I see the total size of my bank, to make sure the inverter "sees" both correctly?

4) I can't see or get to any other BMS settings or values through the inverter screen, yet on the Deye manual it states there should be a screen as below?? I cannot see this screen??

Many many thanks once again for any feedback, I really appreciate it.

 

 

 

Edited April 15, 20233 yr by flyfisherman

The screen you see on LiBMS 03 is the correct one. The one showing all that extra detail is not for Lithium batteries with comms. You won't be able to see individual battery or cell info just from the inverter. Adding something like Solar assistant with the relevant battery cables will help. 

Are your 2batteries connected with a comms cable as well? If so then the BMS knows about them both. BMS will manage the charge and discharge amps based on variables incl load, temp, SOC etc based on the max values you have set (for both grid and PV) 

27 minutes ago, mzezman said:

The screen you see on LiBMS 03 is the correct one. The one showing all that extra detail is not for Lithium batteries with comms. You won't be able to see individual battery or cell info just from the inverter. Adding something like Solar assistant with the relevant battery cables will help. 

Are your 2batteries connected with a comms cable as well? If so then the BMS knows about them both. BMS will manage the charge and discharge amps based on variables incl load, temp, SOC etc based on the max values you have set (for both grid and PV) 

Hi,

Thanks for the feedback. Yeap, batteries connected via comms cables, as per attached.

So I guess it's all sorted then. Next steps get solar assistant / some wireless monitoring etc set up

On your LiBMS page it says 50A discharge which implies the inverter is only seeing one battery .Check your comms between the 2 batteries dip switches ect. It should say 100A for 2 batteries on the BMS page .Also set your discharge amps in the battery menu to 100A when you have the comms between the 2 batteries sorted so that you can pull the full 5Kw from the inverter.

6 minutes ago, Nexuss said:

On your LiBMS page it says 50A discharge which implies the inverter is only seeing one battery .Check your comms between the 2 batteries dip switches ect. It should say 100A for 2 batteries on the BMS page .Also set your discharge amps in the battery menu to 100A when you have the comms between the 2 batteries sorted so that you can pull the full 5Kw from the inverter.

Hmmm, the comms cables are connected as per post above...they seem correct as per user manual (done by the installer). This is why I started this post, as I want ot make sure the inveretr is "seeing" both batteries, but I am not sure how to tell if it is?

11 minutes ago, flyfisherman said:

but I am not sure how to tell if it is?

On the LiBMS page it will pick up the discharge current limit as 100A (50A x2)

34 minutes ago, Nexuss said:

Also set your discharge amps in the battery menu to 100A

Stupid question, but I try and change that value in the image below from 70A to 100A, but it does nothing when I click on that white box...how do I change that value? (Feeling really stupid now)

 

27 minutes ago, flyfisherman said:

Stupid question, but I try and change that value in the image below from 70A to 100A, but it does nothing when I click on that white box...how do I change that value? (Feeling really stupid now)

 

It should let you change it by clicking on it afaik but dont set it higher just yet,you have to get the BMS page to report the correct values first. Sorry i dont know those batteries so cant help you there.  As it stands now i think the battery is going to trip if you do more than 2,5kw(50A) for a while.Maybe some Dyness users can chime in soon.

Edited April 15, 20233 yr by Nexuss

I have the same setup, through Solar Advice. Initially my inverter would trip when I used the batteries during loadshedding with a load of about 2.5kw.

Solar Advice arranged for the installers to come back and they changed the max discharge to 115, with the max charge set to 60. After that, I could get closer to 4.5kw before the inverter trips.

My BMS also says 50A discharge. I'll follow up with Solar Advice for them to confirm if the BMS should see both batteries. Might just be an inverter limitation in terms of reporting.

12 hours ago, CESPACH said:

they changed the max discharge to 115, with the max charge set to 60. After that, I could get closer to 4.5kw before the inverter trips.

My BMS also says 50A discharge. I'll follow up with Solar Advice for them to confirm if the BMS should see both batteries. Might just be an inverter limitation in terms of reporting.

Hi, thanks for the reply. Would be interesting to see what Solar Advice say about the BMS values, if it should see both or if this 50A discharge just some bug/limitation.

On 2023/04/17 at 1:54 AM, flyfisherman said:

Hi, thanks for the reply. Would be interesting to see what Solar Advice say about the BMS values, if it should see both or if this 50A discharge just some bug/limitation.

Hallo @flyfisherman did you manage to resolved your problem? 

On 2023/04/15 at 11:48 AM, flyfisherman said:

Hmmm, the comms cables are connected as per post above...they seem correct as per user manual (done by the installer). This is why I started this post, as I want ot make sure the inveretr is "seeing" both batteries, but I am not sure how to tell if it is?

It looks like from your pictures that the dipswitches are not in the correct positions and that is why he mentioned that the inverter is only see 1 of the 2 batteries in terms of BMS reporting. Did you remedy the dipswitches as per the manual?