Hello everyone, I need a little help (if anyone has ever encountered this issue) with a battery pack connected to my inverter (Axpert Max 8000-48 with removable display). The battery pack come from Basen and has its own configurable BMS (set to "Voltronic" as per instructions).

The cable pins are correct and checked, going from battery 485-B to Pin 3 of the inverter RJ45 port and 485-A to Pin 5 of the inverter.
The inverter is set to "LiB" as of battery type (Parameter 05) as per instructions.

But no matter what, the battery won't communicate, and after a while it shows up the error 61.

I had the original Voltronic firmware that come with the inverter, i believe the main was 40.08 or something like that, and the MCU 112.15. The seller suggested to update the firmware to see if it would have solved the issue, and gave me the main 46.77 and the MCU 12.21. But no way the battery still not communicating.

Is there anything else I could try? A different firmware? Is there anything more recent around? The communications/protocol issues are usually related to the MCU firmware?

Thanks for your help.

21 minutes ago, npole2000 said:

The cable pins are correct and checked, going from battery 485-B to Pin 3 of the inverter RJ45 port and 485-A to Pin 5 of the inverter.

Thats correct for LIB RS485. But are you sure that LIB is the correct protocol? Is that what the BMS manual states? 

 

Yup, not just the manual, but even their direct support, they said to configure the BMS with the "Voltronic" protocol, and the Inverter set to "LiB".

Nor that I've just tried that... for the sake of it, I've also tried every other combination, including setting the BMS to "Pylontech" and the inverter to "PYL", but no avail. I've also tried other combinations, like LiC, LiA.

Nor that I have many other options to "experiment", the connection they said it must work is just the two cables named "A" and "B" (on the battery RJ45 they are the pins 2 and 1) connected to the pins 5 and 3 ..and that's it. Today I also tried to connect the GND (you never know...), but as expected it didn't make any difference.

Today the battery vendor wanted a video showing the connections, I'm not sure how a video would help as they are two wires... but who knows. I still believe it's a protocol compatibility issue.

4 minutes ago, npole2000 said:

Nor that I've just tried that... for the sake of it, I've also tried every other combination, including setting the BMS to "Pylontech" and the inverter to "PYL", but no avail. I've also tried other combinations, like LiC

Good to know, thanks. Of course there is the outside chance that you might have a faulty tranceiver on either the inv side or the bms side.  There are ways to check that, but lets first see what your support vendor can come up with. 

The only thing that I did to verify if there's some sort of activity, it have connected a multimeter to the inverter port pin 3 and 5 and there's voltage fluctuation so something seems to happen... i don't have a serial sniffer, so I dunno what's going on there... nor it's supposed for me to do so, i bought a "battery pack" with the sole purpose of not having to invest time into building one with cells and CMS, to avoid this sort of troubles... ironically!

Can you pls. check what BMS is installed in the battery box?

I expect it's a seplos, because I have a similar problem.

Simply connecting a RS485toUSB converter in parallel to the A/B wires lets you sniff the protocol. So far I gues the LIB protocol implementation in the seplos is faulty.

BTW: I tried it with a Axpert MAX II 8KW (E61) and a Infinisolar 10k.

I have no idea about the BMS, as I believe it's customized, nor I can physically open the battery for obvious reasons (warranty), but I may ask Basen...
From the software I only a code in the BMS field: hs-hes16s48v100lt52

Assuming it's really about a bugged implementation, how they didn't figured it out before assembling this packs? Nor that they aren't selling them like hot cakes...

Can you pls. post some pics (to see connector placement, display when turned on, screenshot of the software that comes along with)?

Well, my knowledge is that chinese developers add code for protocols of different inverters in their BMS but they are not really able test.
They just mention that it "should" be compatible with inverter x. No bms manufacturer can test all different types of inverters, firmware versions, etc.

If they implement neccessary fixes after some complaints and you are able to upgrade the BMS with a new fw, then I'm quite ok with that.
 

This is the video i sent to them.. if it gives any idea.

https://mega.nz/file/MRskiJ5T#_XAFjF2kaxDUWwPx7oLXR8jdfRclOHSuUTpjQebazjY

Ok, looks like a DALY bms. Concentrate your investigation on DALY.
As I have no seplos and not daly, I'm out.

Thanks! From what did you guessed it...?

It couldn't be this? The ports, leds, switches... they matches:

https://www.seplos.com/seplos-48v-100a-13s-14s-ncm-15s-16s-lfp-battery-management-system-smart-bms-3.0-for-lifepo4-battery.html

Edited October 10, 20232 yr by npole2000

Seplos looks pretty similar. As I couldn't see the connectors and display on your video, I just googled the software you've used.
And this seems to be DALY bms software.

Looking at the software info, it says "TBD Power" and the only reference I found online about it is Tian Power BMS. I downloaded one of their BMS tools and it's almost identical to mine... I'm not sure if it's a rebrand or what.

As stated above, would you post a pic of the connectors and the display when turned on?

11 hours ago, riogrande75 said:

Seplos looks pretty similar. As I couldn't see the connectors and display on your video, I just googled the software you've used.
And this seems to be DALY bms software.

Hi @riogrande75 are you sure its Daly? I have a Daly but its BMS protocol is not Voltronic compatible. 

But maybe the later models are different to mine. 

 

 

No, off course not. This was just a idea after quick g**geling what I saw in the video. As I don't have clear pics, it's pure speculation.
Maybe some screenshots of the windows software would also give us a idea of the used bms and the fw version running on it.
 

Stop: This post makes me more think that you have a Revov BMS.

Anyhow, to make progress on your basic problem, a RS485 trace (either with a USB adapter and RealTerm or with a ip converter like USR-TCP-304 and wireshark) would be very helpful.
In the meantime I have the impression that I'm quite experienced in reading LIB, pylontech or modbus traces.😉

That would be the next step (while the ultimate one would be to place Solar Assistant in the middle.. 😒 ). Yes REVOV uses Tian Power BMS, and as I said in the previous post, their software is identical to mine. I didn't posted the pics, because they are all available on the website, including the connectors side: https://www.basengreenshop.com/48v-lfp-series/basengreen-10kw-wall-mounted-51-2v-200ah-lifepo4-battery-pack-for-solar-energy-storage

And part of the screen... sorry I don't have a better one as I'm in another house (attached).

I agreed with the vendor to receive a cable made by them... I think they doesn't trust my connecting skills ...I had to accept as they wanted to be sure before proceeding further...

Oh finally.. here's my BMS: https://tian-power.com/en/page-40889.html   (LT-52 model). I'm unsure if they customized anything in the firmware tho.
As I mentioned in the other post, the model number reported by the software is: hs-hes16s48v100lt52

Also, NARADA batteries uses the same type of BMS: 

 

Edited October 11, 20232 yr by npole2000

Ok, so no seplos and no daly too. Even the display on their website reminds me of daly, yours seem to be different. Didn't even know about Tian BMS before...☺️
Anyhow, without RS485 traces I cannot help at all.

Me neither.. never heard that name, until I discovered is one of the biggest BMS brand. Probably they only do things for third parties which uses their name in their custom products. However there's very little documentation if searching for Tian Power specifically.

I will wait for this new cable (I don't think it'll make any difference...) and if the vendor doesn't help to solve the issue, I'll start with "sniffing...".

Oh and there's an interesting video with my exact panel menus etc (10:25):
 

 

Edited October 11, 20232 yr by npole2000

You know what... after have agreed to receive a new cable for further tests, I watched those videos I found around that are using the same/similar BMS, and I noticed a difference in the address settings, despite they told me to leave it with addr1 (first dip switch ON), looking at those videos and at the documentation of that BMS, for a single battery usage the address should have been 0 (all the dip switches to OFF) as 1 (and others...) are reserved for parallel usage. So I reported this finding to the vendor asking if that could be the issue.. they said to wait for the new cable. But since I'm one of those persons who likes to experiment, I didn't meant to wait and flipped the switch, reset the BMS... and wow, it did connect after few seconds.
So it wasn't the cable, it wasn't the protocol compatibility, it was just a wrong settings. I'm so sorry to have wasted your time, without the proper documentation it was hard to figure. Anyway, now I'm happy to have the battery communicating with the inverter, I can read the real SOC, set the % of charge/discharge and all the stuff!
Hurra.

On 2023/10/13 at 5:00 AM, npole2000 said:

But since I'm one of those persons who likes to experiment, I didn't meant to wait and flipped the switch, reset the BMS... and wow, it did connect after few seconds.

Well done. But imagine all those other customers who don't know about forums like this, or just aren't the experimental type, and how much frustration they would have had.

I remember a world where bad documentation like that would be business suicide. The company would be hugely embarrassed, and would be falling over themselves to repair their reputational damage. These days it's just huh, oh really, that must be a typo.  We don't care, we have your money.

To be honest, the company has been very helpful and in constant contact. I imagine that in a way or another they would have figured the issue, but it would have taken more time (in the end they sent me a new cable to start to solve the issue...). If they wouldn't have replied at all, and left me with the issue, I wouldn't be happy.. and they would have lost a customer (and real money, nor potential... coz after the issue has been solved, I've bought a second battery from them! ).

Hi Guys!

I have a little issue with Axpert Max 8 with battery communications. The comm between inverter and batteries is ok /Lib/, but if i watch the inverter thru the app, there is showed every time 100% the SOC. Independently from the real charge/discharge amps/voltages. It shows 100% when it's fully charged or in the morning when it's around 40-50% discharged. 

If i check the history in the app there is randomly shows the real capacity, 96% ;80% etc but in the next history page it's 100% again and the battery voltage is the same. I checked the BMS but it seems works well. I have a four 5kwh battery pack (20kwh) and it seems that during the night them consumpting only from the 3 slave node the master is keep itself fully charged. But if i check the batteries real time thru it's BMS software during the discharging,  all nodes discharging incl. the master node too.  Is it normal or it has any issue with? 

 

Thanks 

 

Janos