Recent content by KaFun

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

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

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...

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...

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?

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...