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

Mr.Michael

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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.
 
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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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.
 
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.
 
I think the Daly is potted inside the pretty red enclosure and has no meaningful way to be disassembled.
No idea if this helps since it’s ran for so long fine but you have disabled the sleep setting right
 
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.
 
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
 
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
 
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.
I assume so I have 3 4S units random shut downs of 280Ah units while running only 750watts on a 1000w Xantrex 3 to 7 hours random shut down Replacing With Overkill The first Overkill I bought when in on the same battery the Daly was on Started up run for a month so far noissues
 
I exchanged a few emails with Daly but that seems to be a waste of time. I send more details and log files but didn't get anywhere with them.

I had 3 more shutdowns while the system basically was at idle. When we are not at the cabin only the DC DC 12V converter is running to supply the DSL modem with power as well as one fridge. That is about 500mA compressor off and 4A compressor on including the modem.

Same issue, shutdown and you need to pull the balance leads to get it back up. Nothing on USB. I assume no interesting events in the log either as I sent those to Daly and got nothing.

Dont buy this model.
 
I'm having a similar issue with my Daly 48V 16S 150A (model R32U1, I guess). It'll be happily charging/discharging for two and a half hours, and then randomly kicks into sleep mode. It looks fine if it wake it up, but then it just falls asleep again in another two hours.

With this, I've supposedly disabled sleep, by setting the timer to 65535, but it still does it...

Have you made any progress in the past few weeks?
 
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