Hi guys,

 

please kindly assist, I am having solar system of 8KW DEYE Inverter, 8x 455 Panels and 1 x 5.12KW CFE Lithium battery.

The battery settings are as follows:

Shutdown: 20%
Low Batt: 35%
Restart: 50%
 

Around 5am, the battery was sitting on 43% and the consumption was round 300w. Then around 7am we were up and busy preparing for work, ironing and stuff and the inverter stopped supplying the house. When I went to check the battery was on 1%.

 

isn’t that it was supposed to stop supplying immediately when the battery got depleted below the 20% as per the settings?

 

21 minutes ago, Sibo.Pro said:

isn’t that it was supposed to stop supplying immediately when the battery got depleted below the 20% as per the settings?

I would think so... questions would be...

1. Are the inverter and the battery talking correctly to each other?
2. You are aware that the battery is actually on the weedy end of the scale and really too small for your inverter?

If the comms between inverter and battery are functioning correctly the inverter should have shut down earlier, with still 20% capacity in the battery, but I have seen otherwise, where the inverter charged the battery from solar to 100% at sunset and was not set or able to charge from grid and the 100% reported by the battery was not *really* 100%, it still needed some amps to actually get to 100% and a bit of balancing, so the assumed 30% or whatever on the discharge end, all of a sudden was only 5% and seconds later, the battery pulled the rug out from under the inverter...

Hi, I am starting to doubt the batteries is properly communicating with the inverter, I used to have issues just after the installation where the inverter will display no battery even when the battery is there, and sometimes cut the supply and resumes few seconds after.

But after the inverter and battery firmware was updated, the system has been stable since then, last year November.

now I just picked this problem, I tried to replicate it this morning, and the inverter tripped at 40% even though the settings are still the same, something is definitely not correct, the installer is also not sure of what exactly is the solution to this.

 

With regards to the battery being too small, I agree the system is currently just running essential load which is not heavy, the plan it to add more batteries soon and then carry the whole house.

Edited January 17, 20232 yr by Sibo.Pro

My Deye inverter shuts down on 10% so I think Meerkat is right the BMS is not communicating correctly.

On 2023/01/17 at 4:06 PM, Sibo.Pro said:

Hi, I am starting to doubt the batteries is properly communicating with the inverter, I used to have issues just after the installation where the inverter will display no battery even when the battery is there, and sometimes cut the supply and resumes few seconds after.

But after the inverter and battery firmware was updated, the system has been stable since then, last year November.

now I just picked this problem, I tried to replicate it this morning, and the inverter tripped at 40% even though the settings are still the same, something is definitely not correct, the installer is also not sure of what exactly is the solution to this.

 

With regards to the battery being too small, I agree the system is currently just running essential load which is not heavy, the plan it to add more batteries soon and then carry the whole house.

How did you try replicate it? If your battery is 0.5c that is only 2.5kw of load. Maybe it tripped at 40% because you overloaded it

On 2023/01/17 at 4:06 PM, Sibo.Pro said:

Hi, I am starting to doubt the batteries is properly communicating with the inverter, I used to have issues just after the installation where the inverter will display no battery even when the battery is there, and sometimes cut the supply and resumes few seconds after.

But after the inverter and battery firmware was updated, the system has been stable since then, last year November.

now I just picked this problem, I tried to replicate it this morning, and the inverter tripped at 40% even though the settings are still the same, something is definitely not correct, the installer is also not sure of what exactly is the solution to this.

 

With regards to the battery being too small, I agree the system is currently just running essential load which is not heavy, the plan it to add more batteries soon and then carry the whole house.

Does this battery not come with a wifi module that you can use to see the actual BMS data using the CFE app?

Without access to the BMS real time data it will be difficult to troubleshoot 

I have the Raystech 5100S which is just a rebrand of the CFE 5100S and I have experienced the exact same problem. 

I had a few F56 DC Low voltage errors on my Sunsynk, and in the last 4 hour load shedding slot, the batteries went from 70% to 51% and straight down to 1%. 

Feedback from my installer, which they got from Raystech:

if SOC of raystech or CFE 5kWh battery has drop to 1%, it is due to a bug in the BMS, the supplier will release the update within one week. Then we can update the battery remotely. Plz let the client or installer register those battery in Smart BESS system. So we can update the BMS after it is released.

They are installed in parallel, and the Smart BESS showed 2 very different SOCs before this happened (70 and 35).

My batteries are now in a state where they refuse to charge, and 1 of them is flipping on and off on its own permanently. Smart BESS shows both SOCs as Zero now

Edited February 20, 20232 yr by MeepMoop
Some info

@MeepMoop wrote:
>My batteries are now in a state where they refuse to charge, and 1 of them is flipping on and off on its own permanently.

Try enabling "Activate" to revive a discharged battery.

Edited February 20, 20232 yr by system32

@system32

We did give that a go today with the installer. Didn't work. 

I tried it again now just for fun. No success. Thanks anyway

That's how the LiBMS screen looks now. 

https://photos.app.goo.gl/Ysfq1H7m8BnT3Jyr5

Edited February 20, 20232 yr by MeepMoop
Quote

36 minutes ago, MeepMoop said:

@system32

We did give that a go today with the installer. Didn't work. 

I tried it again now just for fun. No success. Thanks anyway

That's how the LiBMS screen looks now. 

https://photos.app.goo.gl/Ysfq1H7m8BnT3Jyr5

What's the settings on System Mode?
Suggest something like this:
Enable Grid Charge Below 20% - change to 50% (or a suitable value)


Enable grid charge:

Alternatively, try changing the battery to AGM/V and manually setting the voltages on the various screens.
I did that for a while with Hubble AM-2 which also had broken firmware.

Edited February 20, 20232 yr by system32

System mode was attempted without timer, and timer for 100% in all slots. As well as AGM V mode, with 56v in all parameters. One of the batteries still keeps tripping. 

 

The last thing I can think of is that the Grid charge amps is too low for the "Request Force Charge" that the BMS is sending to the inverter. I could try setting Grid charge amps to something like 150A? (where the installer left it on 85A)

1 hour ago, MeepMoop said:

System mode was attempted without timer, and timer for 100% in all slots. As well as AGM V mode, with 56v in all parameters. One of the batteries still keeps tripping. 

 

The last thing I can think of is that the Grid charge amps is too low for the "Request Force Charge" that the BMS is sending to the inverter. I could try setting Grid charge amps to something like 150A? (where the installer left it on 85A)

In terms of Grid Charge Amps, you need to factor in your grid feed.
My grid feed is an 60Ax230V =  13.8kW feed.

Grid Charge Amps is at 48V, I found 40Ax48V = ~2kW to be plenty, leaves ~11.8kW for the rest of the house.
In my setup, the 2kW Grid Charge is only used when the battery goes below 20% to bring it back to 20%.
I have 20kWh of battery, so 20% is 4kWh, so worst case it takes 2 hours to go from 0% to 20%.
My actual Low Battery cut off is about 7%.
In my case I rarely go below 20% and mostly charge from Solar PV.

 

EDIT: Not sure if pbmstools works with your battery - worth a try to check if cells are OK.
 

Edited February 20, 20232 yr by system32

9 hours ago, system32 said:

In terms of Grid Charge Amps, you need to factor in your grid feed.
My grid feed is an 60Ax230V =  13.8kW feed.

Grid Charge Amps is at 48V, I found 40Ax48V = ~2kW to be plenty, leaves ~11.8kW for the rest of the house.
In my setup, the 2kW Grid Charge is only used when the battery goes below 20% to bring it back to 20%.
I have 20kWh of battery, so 20% is 4kWh, so worst case it takes 2 hours to go from 0% to 20%.
My actual Low Battery cut off is about 7%.
In my case I rarely go below 20% and mostly charge from Solar PV.

 

EDIT: Not sure if pbmstools works with your battery - worth a try to check if cells are OK.
 

I tried a higher amp setting to allow the "force charge" that the BMS requested. No dice. But I'll keep those things in mind once I get my panels installed. 

Regarding individual cell values, I can see them using Smart BESS.

They look okay to me

On 2023/01/16 at 7:00 PM, Kalahari Meerkat said:

I would think so... questions would be...

1. Are the inverter and the battery talking correctly to each other?
2. You are aware that the battery is actually on the weedy end of the scale and really too small for your inverter?

If the comms between inverter and battery are functioning correctly the inverter should have shut down earlier, with still 20% capacity in the battery, but I have seen otherwise, where the inverter charged the battery from solar to 100% at sunset and was not set or able to charge from grid and the 100% reported by the battery was not *really* 100%, it still needed some amps to actually get to 100% and a bit of balancing, so the assumed 30% or whatever on the discharge end, all of a sudden was only 5% and seconds later, the battery pulled the rug out from under the inverter...

 

On 2023/01/20 at 12:02 PM, Chris_S said:

How did you try replicate it? If your battery is 0.5c that is only 2.5kw of load. Maybe it tripped at 40% because you overloaded it

 

On 2023/02/20 at 5:06 PM, MeepMoop said:

I have the Raystech 5100S which is just a rebrand of the CFE 5100S and I have experienced the exact same problem. 

I had a few F56 DC Low voltage errors on my Sunsynk, and in the last 4 hour load shedding slot, the batteries went from 70% to 51% and straight down to 1%. 

Feedback from my installer, which they got from Raystech:

if SOC of raystech or CFE 5kWh battery has drop to 1%, it is due to a bug in the BMS, the supplier will release the update within one week. Then we can update the battery remotely. Plz let the client or installer register those battery in Smart BESS system. So we can update the BMS after it is released.

They are installed in parallel, and the Smart BESS showed 2 very different SOCs before this happened (70 and 35).

My batteries are now in a state where they refuse to charge, and 1 of them is flipping on and off on its own permanently. Smart BESS shows both SOCs as Zero now

Hi guys.

to replicate the behavior I switched off Eskom and let the whole house run from the battery the whole night with base load of less than 1KW, when I woke up early morning just before the panels could start generating, the battery was at 48% and had tripped (not supplying the house). So this isn't an issue of overload, something is just not right. The battery can give me 3KW max

Ever since I replicated this issue it has always been tripping between 48% and 50% during load shedding. Today the installer came to update the battery during load shedding, just before the update the battery was at 51%, after the update it was 100% (the installer told me that an expected behavior after updating it), then the installer left. 15 minutes later after boiling water, about 3 minutes after the kettle finished boiling the water it dropped to 1%, stopped feeding the load and I had to wait for it to start supplying again since it was only charging the battery from Solar which at the time the production was: 800w.

At 10am, the grid comeback and took over to charge the battery and fed the house, an hour or two later the battery was at 49%, 4 to 5 minutes later it jumped straight to 100 percent, now its at 99%.

Contacted the installer again to explain this, and I was told they will get back to me and I am still waiting 

55 minutes ago, Sibo.Pro said:

 

 

Hi guys.

to replicate the behavior I switched off Eskom and let the whole house run from the battery the whole night with base load of less than 1KW, when I woke up early morning just before the panels could start generating, the battery was at 48% and had tripped (not supplying the house). So this isn't an issue of overload, something is just not right. The battery can give me 3KW max

Ever since I replicated this issue it has always been tripping between 48% and 50% during load shedding. Today the installer came to update the battery during load shedding, just before the update the battery was at 51%, after the update it was 100% (the installer told me that an expected behavior after updating it), then the installer left. 15 minutes later after boiling water, about 3 minutes after the kettle finished boiling the water it dropped to 1%, stopped feeding the load and I had to wait for it to start supplying again since it was only charging the battery from Solar which at the time the production was: 800w.

At 10am, the grid comeback and took over to charge the battery and fed the house, an hour or two later the battery was at 49%, 4 to 5 minutes later it jumped straight to 100 percent, now its at 99%.

Contacted the installer again to explain this, and I was told they will get back to me and I am still waiting 

I think it's important to get the CFE app and add the battery on there to see what the individual cells look like and what the real SoC is.

42 minutes ago, MeepMoop said:

I think it's important to get the CFE app and add the battery on there to see what the individual cells look like and what the real SoC is.

Hi, I have the app but I don’t seem to understand the data, please see the images attached.

Something looks wrong with that battery. I would monitor voltages while charging and see if any cells voltages run ahead of the others. 

57 minutes ago, Chris_S said:

Something looks wrong with that battery. I would monitor voltages while charging and see if any cells voltages run ahead of the others. 

Agree, and while discharging, if any run far below others. 

Good day

I have the some problem that your are talking about 

A deye invest with 2 lithium battries for 100 a 48v each

Can u feed me how did solve the problem 

 

On 2024/03/28 at 6:57 AM, Aantoine said:

Good day

I have the some problem that your are talking about 

A deye invest with 2 lithium battries for 100 a 48v each

Can u feed me how did solve the problem 

 

Hi Aantoine.

The company that I bought the system from hooked me up with the CFE support guys from china who remotely analyzed the battery, ran couple of firmware updates and did not work, at the end they swapped my battery with a new one. I haven’t had an issue with the one they swapped with.

The CFE support team is very active on WhatsApp, initiate a conversation with them and they should be able to assist:

Leon: +86 152 9159 5360

Wendy: +86 173 4292 6780