Daly BMS gone crazy..Update Opinions

[jaycocreek]

I was charging my 120ah lifepo4 battery yesterday and came in for lunch and saw it shut down..I figured it hit the 3.65 volt cell limit and shut down,I went out to check it and saw this on the Bluetooth for the BMS and it is locked up tight(The Bluetooth BMS)..I can't change anything and it only shows this on the screen..



The guy I bought it from first told me to reset it in the settings,so I did and he was supposed to send me the numbers/parameters to put in but he instead says he is sending my picture to the manufacturer for there take on it..After resetting I tried to just put in Lifepo4 as the battery type but it won't take it..

Hmm

[otrfun]

Here's some steps we took to get our Daly BMS working much more efficiently that may prove helpful to some.

We purchased a 200a Daly Smart BMS 4s about 3 mo. ago (Mar 2021 production date). Discovered very quickly a large number of factory presets must be adjusted and calibrated to enable the Daly to generate much more accurate current/voltage (and SOC) data. Accurate voltage/current data is essential to effectively protect your cells. Unfortunately, the Smart BMS BT app only offers very limited capability in terms of adjustments & calibrations, so Sinowealth (Windows app) must be used.

Highly recommend calibrating the voltage. Our Daly was reading almost .1v low. Not good. Hard to believe, but our Daly was also displaying discharge current as charge current and vice versa. The polarity was reversed. This caused dramatic voltage drops and heat (MOSFETS subjected to reverse current). We corrected this by calibrating the Work Current with the proper polarity. This can be done using either a known load value or clamp-on ammeter (calibrations be accomplished using either charge or discharge current). As for SOC, the low-voltage discharge cut-off and high-voltage charge cut-off values determine the zero and 100% SOC set-points and work hand-in-hand with the Voltage Capacity values. Voltage Capacity values for 10-100% SOC must adjusted significantly different from Daly's default values. You *must* charge to 100% SOC and discharge to the low-voltage cut-off at least two times in order for the SOC meter to establish accurate set points. Another critical adjustment to get the SOC and current readouts to display accurately is the proper adjustment of the Dfitter current. This value should be adjusted to the lowest value possible (ideally <=100mv) without incurring random readouts under zero load conditions. A zero load calibration must be accomplished after every dfitter adjustment. If the dfitter and zero load values are not adjusted properly it will effect both the realtime current readout (especially at lower power levels) and skew the SOC readouts significantly over time. Lastly, make absolutely sure when you're doing any current calibrations that you use (-) neg values for discharge and (+) pos values for charge.

After quite a bit of trial and error we finally got all these preset values dialed in. Our BT Smart BMS SOC display is now very accurate. Current readouts are accurate down to .1v. Important since erroneous current readings can skew the SOC readout very quickly. We also purposely exceeded the most important voltage, current, and temperature thresholds to verify all BMS protections are operating at their proper values. All is good.

If you're willing to take the time to get all these values dialed in, IMO the Daly has the potential to be an awesome BMS that will offer excellent protection and operate at its rated maximum current with minimal heat output. If you're wanting more of a plug & play experience, I would definitely not recommend a Daly--lol!

[joshua700]

Hi,

I think we have the same issue. How did you fixed the bluetooth module issue?

[FWC]

Unfortunately you will never really know if the cell level BMS protections are working without access to each cell.

You could test the pack level protections by running the pack down below 10.0V. The pack should shutdown.

jaycocreek wrote:

you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working.

I have searched the net for a couple days trying to find something that tells you how to tell if your BMS is working properly in a sealed battery..Can't find anything..

So how can I tell if my BMS is working properly with the smart shunt?

After the crazy readings I'm certainly an curious.....

[BFL13]

You also need an LFP version of the range hood battery monitor for the different set of voltages that go with each colour. Can't go camping unless that range hood monitor is working right! 🙂

[jaycocreek]

you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working.

I have searched the net for a couple days trying to find something that tells you how to tell if your BMS is working properly in a sealed battery..Can't find anything..

So how can I tell if my BMS is working properly with the smart shunt?

After the crazy readings I'm certainly an curious.....

[FWC]

Yes, those look reasonable.

[jaycocreek]

I got a screen shot of these settings before trouble hit..Do these seem right?

[jaycocreek]

3 tons wrote:
Congrats, heres a smart shunt link:

https://www.youtube.com/watch?v=0HG4GiH9su8

Thanks,that was more in debt,especially for the app,than the one Will had out on it but Will does show what to put in the settings for a Lifepo4 battery in setup...

Coming Monday..Yay lol

[3_tons]

Congrats, heres a smart shunt link:

https://www.youtube.com/watch?v=0HG4GiH9su8

[jaycocreek]

Since I got a $50 credit for the faulty Bluetooth in my battery,I think I'll spring for the Victron smart shunt..I truly like the ability to see the stats on my phone and the SOC is important to me...

Thanks

[StirCrazy]

jaycocreek wrote:

you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working.

I'm seriously concidering just that but I'm not sure what stats that shunt shows and how accurate they are....I suppose being Victron, there as accurate as can be..

there are actualy quite a few things showen and you can set alarms for different things also. personaly I think Victron stuff is way over priced, sorry I am not a Victron fan boy, but there smart shunt doesnt seam to be priced to bad.

Steve

[jaycocreek]

you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working.

I'm seriously concidering just that but I'm not sure what stats that shunt shows and how accurate they are....I suppose being Victron, there as accurate as can be..

[StirCrazy]

jaycocreek wrote:
I guess this is the final update from the seller:

This glitch is entirely to do with the Bluetooth and not the BMS. The BMS is set at the default settings which are best for the battery. So it will perform as it was designed to.

We are offering all customers that have a failing Bluetooth 2 choices: (1) Total Refund. (2) $50 rebate by PayPal.

Until we figure out the revamp on the Bluetooth we will not offer this feature with the Cased Batteries with this option, instead we will program them and reset the password.

Let me know what you want to do.

Sorry again for the inconveniences.

What is your opinion of this e-mail..

1-Do you think the BMS is okay as he stated?

I guess we never really know if a BMS is okay buying a cased battery until something happens,hence Will P tearing down batteries with claims of cold cut off that do not work..But I haven't seen one with a totally failed BMS yet leading to a completely destroyed battery..

What's your opinion?

you do have another option here, you could buy a victron bluetooth smartshunt and be able to monitor everything thst will help you determin if your BMS is working.

Steve

[StirCrazy]

Itinerant1 wrote:
I'm for one of the guys that built their own to start a thread with how "they" did it or the next person doing it to start one. Some folks don't venture from this site to other sites that answer alot of the noise that gets produced and may cause confusion to new readers. 😉

guess I could just post a youtube video of some one building one to show how easy it is. there are several good ones out there, i'll take a look.

Steve