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  1. K

    Decoding the DALY SmartBMS protocol

    I haven't played with the DI/DO myself but I guess, one would need a special firmware on the BMS that allows for it. I had to ask quite nicely for a firmware that let one change the board number (which you obviously mastered already) and I know that there is another firmware that lets one...
  2. K

    Daly Parallel Module

    Nice work! And as @HateGrid already mentioned, if you change the board number on your DALY BMS, you can address them separately using a single RS485 bus (or CAN, but I did not verify that). I have four 16S batteries in parallel reporting to one single RasPi on a RS485 bus. I had to flash the...
  3. K

    DC fuse caught fire! Help ?

    Have you tried to do that? As you wrote "theoretically" I assume, you did not try this yet. But this test could set your mind at rest! The way I understand this system is that there is no connection between AC IN and AC OUT except in "Bypass Mode". Only then the relay switches the AC OUT...
  4. K

    DC fuse caught fire! Help ?

    I don't know, but I have an assumption about this that it definitely won't back feed and here it goes: Let's assume the AC IN has just two ways to go into the system: Through the bypass relay and through the battery charger (which is actually just an AC/DC converter to a DC rail plus the battery...
  5. K

    DC fuse caught fire! Help ?

    I read through the manual - it seems to be the same as mine. My unit also can run without a battery, but I never tried it. I've found the attached description of the mode you're probably referring to (page 32/60). It seems indeed as if the internal inverter synchronizes its output to the grid...
  6. K

    DC fuse caught fire! Help ?

    I have a similar unit but the 5.5kW 48V version and I read this functionality different! The way I understand it is that as soon as the requested AC power is greater than your AIO can provide, it switches into bypass mode, i.e. an internal relay disconnects your internal inverter output and...
  7. K

    Daly Parallel Module

    Thanks for the confirmation. I'd rather be safe than sorry.
  8. K

    Daly Parallel Module

    Thanks for the soothing words. I am well aware of the issue with weak cells in a battery pack and I also follow your thoughts regarding low SoC behaviour. My worries are around the moment a high load switches off and equalizing currents run from high series resistance batteries to those with low...
  9. K

    Daly Parallel Module

    Well, I hope, I overthink it, but I am not sure, hence the discussion here ... My line of (over-)thought: As I do not have 100% identical batteries plus the connecting cables are slightly different, this all adds up to different series resistors (differently aged cells, connector resistance...
  10. K

    Daly Parallel Module

    Puh, I am an Arduino level programmer and was not planning to develop my own BMS ... Furthermore, when I can predict my charge/discharge currents, I do not expect to have huge problems with body diode power dissipation. This is because if leaving a high load status (i.e. switching back to more...
  11. K

    Daly Parallel Module

    Yes, the body diode heat dissipation is the weak point of this idea ... Any idea on the hardware-based control of the MOSFET switch?
  12. K

    Daly Parallel Module

    You hit the point, HateGRid, with your analysis of industrial battery packs but you are mislead with your assumption of the DALY solution assuming all the magic is within the add-on unit. What I picked up from one of the AliExpress pages are the attached two pictures. One shows an inside to the...
  13. K

    Daly Parallel Module

    I have four 16S-batteries in parallel: three 200Ah with DALY BMS 100A and one 105Ah with a DALY BMS 60A. Each has its own DC breaker just in case. Each battery also has its Hankzor Balancer. They behave and play nicely together. I monitor them in 60s time frames and have them running for more...
  14. K

    Fucked up my BMS

    Congrats on the successful BMS repair. Can you please upload both firmware files in the resource section together with a proper walk through so other can profite from your know how instead just knowing you did it?
  15. K

    DALY BMS firmware to assign board numbers (DalyBmsApp_20210216B.s19) - DALY R25A-based BMS can be upgraded with this firmware

    I upgraded successfully two versions of R25A BMS (16S 48V 100A): R25A-GJS1 - this went without a hitch R25A-HFO4 - this was more of a roller coaster ... Here the full story of the R25A-HFO4 upgrade: I used the DALY Monitoring Software version1.28 and a RS485 adapter to upgrade this BMS. All...
  16. K

    Decoding the DALY SmartBMS protocol

    I bought a CAN adapter and successfully communicated with a DALY 16S 100A BMS using the DALY software - so I know it works and blasting fast it is !!! On the other hand, I tried to get "behind" the CAN bus protocol and I assume, DALY is just using CAN hardware and run their own protocol on top...
  17. K

    Raspberry Pi Bluetooth Monitor

    Hi Scott, Congrats on the great project. I am working on something similar but not yet as elaborate as yours - I am busy getting the communication stable. And from this perspective I ran over the problem of the DALY Bluetooth adapter falling asleep after a certain time. So I decided to connect...
  18. K

    How to connect a DALY BMS via UART with a Raspberry Pi 2022-03-20

    This is a description to connect the DALY BMS UART interface directly with - in this case - a Raspberry Pi. On one hand, this saves energy the USB adapter draws and eliminates one components that might fail and on the other enables waking up the BMS when information is needed. This feature is...
  19. K

    Decoding the DALY SmartBMS protocol

    Thanks for uploading the protocol description in the Resources section. Some comments: The document you posted does say "MODBUS" protocol but MODBUS is a specific protocol that definitely looks different (see MODBUS on Wikipedia). So I assume the author used this name because it probably uses...
  20. K

    Decoding the DALY SmartBMS protocol

    You can upload it in the "Resources" section. That's where it would belong ...
  21. K

    JBD 4S 200A BMS in Parallel

    Yes, this is a great feature. Unfortunately, in Germany, utility provider do not allow for such systems to be installed.
  22. K

    JBD 4S 200A BMS in Parallel

    You write "with the cells being rather new i see no imbalance happening soon." - this I would not bet too much on! If you do not cycle your batteries all the way through, i.e. also allow for full charging following by balancing (DALY BMS is supposed to balance cells as well), this will not work...
  23. K

    JBD 4S 200A BMS in Parallel

    Interesting project! If I understand correct, you'll have 13 separate battery systems, each 48V 32Ah connected in parallel. What I have trouble understanding is what you're doing with the diodes. If you put them on positive side of the each battery, then you allow each battery only to discharge...
  24. K

    First question! Daly BMS unable to communicate with PC!

    That sounds like there is nothing going right ... When you say "Bluetooth connects on the phone ...", I assume you have a DALY BT dongle attached (and nothing else). So then only the phone app would access the BMS and you should get all the information. Same should happen, if you use instead of...
  25. K

    JBD 4S 200A BMS in Parallel

    There's a general problem I had to encounter unfortunately (independent of paralleled batteries): When charging my batteries with a solar MPPT charger and the (last) BMS decided to switch off because the battery was fully charged, there had been a voltage spike destroying my inverter input...
  26. K

    JBD 4S 200A BMS in Parallel

    Well, this sounds reasonable to me! Maybe the "Do not use in series or parallel!" statement is just to scare people off to avoid trouble later on. Which of course makes sense, because when dealing with these amounts of energy you'd better know what you're doing! An arc burns for quite a long...
  27. K

    JBD 4S 200A BMS in Parallel

    Not sure if I got this right ... why do you expect that the MOSFETs of each BMS can not handle the amperage? IMHO the MOSFETs are supposed to protect the cells also from a short by switching off. So if there would be an "enormous amperage" (e.g. because all but one BMS already switched off)...
  28. K

    JBD 4S 200A BMS in Parallel

    Can you please explain further? I assume, with backfeed you refer to some unwanted back and forth charging/discharging between batteries. Can this be controlled by controlling the charge MOSFET on a smart BMS? I think along the lines of preventing charging of two batteries out of a...
  29. K

    Decoding the DALY SmartBMS protocol

    Have you tried logging the Bluetooth protocol that is sent between the BMS and e.g. your phone with an ordinary Bluetooth sniffer/logger? I've heard, there are a few good sniffer out there and you might be able to see, what protocol the BMS BT adapter is actually using. As the Bluetooth adapter...
  30. K

    Decoding the DALY SmartBMS protocol

    Are you trying this via Bluetooth? GATT is in my understanding a BT protocol profile (https://learn.adafruit.com/introduction-to-bluetooth-low-energy/gatt: "GATT is an acronym for the Generic Attribute Profile, and it defines the way that two Bluetooth Low Energy devices transfer data back and...
  31. K

    Decoding the DALY SmartBMS protocol

    Again, I don’t know your tool! But start try monitoring what you send with another machine (e.g. a RS485-to-USB adaptor on a laptop). Most probably you’re sending not in Hex. To monitor I use hterm in Windows and I have to select “View in hex” not to see garbled stuff. You can compare what...
  32. K

    Decoding the DALY SmartBMS protocol

    I don't know your tool. All I can say is, you are sending the right message. Check again if your tool sends the message as hex (and not ASCII).
  33. K

    Daly BMS impossible to read data by RS485

    You're right: It's either BT or UART. There is another advantage of using RS485: While the UART as well as the BT only "jumps on", when the battery is charged or "activated" by additional accessory, by using RS485 the battery can be woken up simply by querying it. In other words, just sending a...
  34. K

    Daly BMS impossible to read data by RS485

    Sorry to hear that! Speaking of Chinese jungle - the page you linked to shows no RS485 either, just UART and CAN. So be aware that it also might not work with RS485. On the other hand, do you really need RS485 or do you just want to talk to the BMS? Because if your BMS supports Bluetooth it also...
  35. K

    Daly BMS impossible to read data by RS485

    So I'll keep my fingers crossed that it works for you. Please report ?
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