Daly 8S Smart BMS DL-BMS-R32-01E - unexplained shutdown a common problem?

Mr.Michael

New Member
I use the 8S Daly Smart BMS DL-BMS-R32-01E with a 24V 100Ah LifePo4 setup. This mostly works OK. I did set up the system just over 3 months ago so I have about 100 days experience with it. The current measurement seems off, with a 1KW resistive load on the inverter the BMS meter jumps around between 15A and 50A while the water kettle is heating up. The low frequency inverter shows a constant DC current as expected for this kind of load. That is annoying and may lead to inaccurate SOC calculations from the BMS.

Yesterday evening I had the first real problem. It happened just after sunset so the battery was likely at 98%-100% SOC. While running the induction plate at about 900W the BMS shut off. I tried to connect to Bluetooth, no go. So I plugged the USB UART in and also got nothing. The BMS did not connect after repeated tries.

To get it going again I physically disconnected and reconnected the BMS from the cells. This woke the BMS up and all seemed normal. All my parameter settings seem to be OK, cell voltages are OK. The cycle count was also correct. The error statistic was empty. I turned on the kettle as a test load, all good. So it looks like a software crash happened. A 2nd possibility is that the jumpy current meter detected incorrectly an unhealthy high current and shut down everything to protect the BMS and battery. But like I mentioned no errors where recorded.

Hardware: 8S Smart BMS DL-BMS-R32-01E
Software: 20210222-1.01T

Is this a common issue? I occasionally go on multiday trips and do not want my woman to experience this type of failure specially as it also takes out the Internet connection and we do not have any cellular coverage in the area.
 

RCinFLA

Photon Sorcerer
Not normal. Sounds like there is a connection problem in BMS likely on the current sense detection. Its likely shutting down itself because it thinks it is being subjected to over current loading.

Many BMS's have multiple chip resistor shunts in parallel distributed down the long line of MOSFET's. If one of these chip resistors have a bad solder joint, or resistor is intermittant open, it can make the current sense read high making BMS think it has higher load current.
 
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Scph9002

Solar Enthusiast
my 16s bms displays current readings very erratic same as yours. Doesnt seem to affect soc calc tho. I got several 4s bms and they display stable current.

My guess is that the bms above 4s just take snapshot readings of current and display it while 4s bms take the average reading and display that.

Im getting a new 16s bms soon because my bms just died, maybe shitty quality control, maybe shitty software we will see if the new one display current properly.

I tried asking deligreen support and daly support but the support people dont know shit about their own products -.- And i guess the real daly engineers dont know english.

Its so hard find out anything about daly bms.
 

Mr.Michael

New Member
Many BMS's have multiple chip resistor shunts in parallel distributed down the long line of MOSFET's. If one of these chip resistors have a bad solder joint, or resistor is intermittent open, it can make the current sense read high making BMS think it has higher load current.

I think the Daly is potted inside the pretty red enclosure and has no meaningful way to be disassembled.
 

Mr.Michael

New Member
Sleep: Yes I did that within the first 2 days and had no issue after that. I think the sleep function only affects BT, the USB UART should have worked regardless.

Support: I did email them but I am not very optimistic about it. Obviously I want to hear either "use this firmware" or "new one on the way". Since this is a production type system and does supply our cabin with power I can't send it back without a replacement on hand.
 

Jgb3

Solar Enthusiast
Sleep: Yes I did that within the first 2 days and had no issue after that. I think the sleep function only affects BT, the USB UART should have worked regardless.

Support: I did email them but I am not very optimistic about it. Obviously I want to hear either "use this firmware" or "new one on the way". Since this is a production type system and does supply our cabin with power I can't send it back without a replacement on hand.
They didn’t want to cover anything on mine and it didn’t work when I plugged it in all they said is they would give me 50% off if I bought another one but eventually they agreed to replace it but I had to ship it to them so that was weeks ago and it’s still in customs in China. I may never see it again and mine was the 500amp smart bms so about $500. The second one I have works but I can only charge at 70amps or the switch opens and sets the inverters over voltage off but never shows an error code on the bms. I’m not impressed with Daly I will be replacing these as soon as I can
 

Martijn

Solar Enthusiast
I use the 8S Daly Smart BMS DL-BMS-R32-01E with a 24V 100Ah LifePo4 setup. This mostly works OK. I did set up the system just over 3 months ago so I have about 100 days experience with it. The current measurement seems off, with a 1KW resistive load on the inverter the BMS meter jumps around between 15A and 50A while the water kettle is heating up. The low frequency inverter shows a constant DC current as expected for this kind of load. That is annoying and may lead to inaccurate SOC calculations from the BMS.

Yesterday evening I had the first real problem. It happened just after sunset so the battery was likely at 98%-100% SOC. While running the induction plate at about 900W the BMS shut off. I tried to connect to Bluetooth, no go. So I plugged the USB UART in and also got nothing. The BMS did not connect after repeated tries.

To get it going again I physically disconnected and reconnected the BMS from the cells. This woke the BMS up and all seemed normal. All my parameter settings seem to be OK, cell voltages are OK. The cycle count was also correct. The error statistic was empty. I turned on the kettle as a test load, all good. So it looks like a software crash happened. A 2nd possibility is that the jumpy current meter detected incorrectly an unhealthy high current and shut down everything to protect the BMS and battery. But like I mentioned no errors where recorded.

Hardware: 8S Smart BMS DL-BMS-R32-01E
Software: 20210222-1.01T

Is this a common issue? I occasionally go on multiday trips and do not want my woman to experience this type of failure specially as it also takes out the Internet connection and we do not have any cellular coverage in the area.
The current reading jumping around is something I've experienced when using an inverter, see https://diysolarforum.com/threads/d...ing-inaccurate-inconsistent.26622/post-336161
 
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