tonio Posted March 13, 2021 Share Posted March 13, 2021 Hello everyone. After 4 months of waiting, LiFePO4 arrived with a battery pack of 10 KWH. https://www.felicitysolar.com/lifepo4-lithium-battery-lpbg48200-10kwh_p51.html Could anyone give a drawing to share the connection between AXPERT VM III and LPBG48200 BMS? LPBG48200 I have the wiring diagram of the communication, the wiring diagram of the AXPERT III, I can't find it for the BMS connector. Or does the BMS not even need 1 battery pack? Greetings Antal. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 13, 2021 Share Posted March 13, 2021 (edited) 2 hours ago, tonio said: Could anyone give a drawing to share the connection between AXPERT VM III and LPBG48200 BMS? The Axperts with the removable display can communicate using about 8 different BMS protocols, but that's not going to cover every possible BMS out there. Have you checked that this particular BMS is supported? If it is supported, the only connections you'd need would be GND, RS485-B, and RS485-A. Or possibly GND, CANL, and CANH if the inverter supports this BMS via the CAN bus protocol. But usually when both RS-485 and CAN are available, the inverter will use RS-485. If your BMS doesn't use the Pylontech protocol, you may well have to update the firmware on your VM III's removable display, and possibly also the main DSP firmware. The RS-485 pinout isn't given in the manuals I have here; you'll have to search this forum for the inverter's pinout, and match it to the above (assuming it's supported at all). I'm pretty sure a post by Youda, probably on his Member Installations Showcase topic, has the inverter's pinout. Edit: from Youda's image: and the pin-out for Pylontechs: it looks like you want to connect pin 3 on the inverter side (RS-485-B) to 5 on your BMS's side, and pin 5 on the inverter side (RS-485-A) to pin 6 on your BMS's side. Again, assuming that the protocol is supported, and by RS-485. Edited March 13, 2021 by Coulomb Quote Link to comment Share on other sites More sharing options...
tonio Posted March 13, 2021 Author Share Posted March 13, 2021 Thank you for your reply Coulomb Greetings Antal Quote Link to comment Share on other sites More sharing options...
tonio Posted March 14, 2021 Author Share Posted March 14, 2021 Hello Coulomb I made the connection, no error. How to see that communication has taken place. Greetings Antal. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 15, 2021 Share Posted March 15, 2021 (edited) 9 hours ago, tonio said: How to see that communication has taken place. I think if you run through the data displays on the removable display, you should get to a screen that has BMS on the first row, and the number of battery modules and battery groups (usually one group unless you have a really big battery) on the lower rows. Edit: but first, you need to change your battery type setting to PyL or one of the other BMS options. You may need to update your display firmware (MCU) to 02.60 or later to have all the BMS protocol options. Edited March 15, 2021 by Coulomb Quote Link to comment Share on other sites More sharing options...
tonio Posted March 15, 2021 Author Share Posted March 15, 2021 (edited) Hi I made a upgrade. Old: New: Shows an error: Error 61: Communications Failure Its have someone idea to solve this error. My cable wiring: Inverter side: Battery pack: Didn't i do it right. Inverter side 3 RS485 B Battery pcak 5 RS485 B , Inverter side 5 RS485 A Battery pack 6 RS485 A Greetings Antal Edited March 15, 2021 by tonio Quote Link to comment Share on other sites More sharing options...
tonio Posted March 15, 2021 Author Share Posted March 15, 2021 I tried to do another firmware but the error is the same: 61. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 16, 2021 Share Posted March 16, 2021 (edited) On 2021/03/15 at 10:19 PM, tonio said: I made a upgrade. Well done. Quote Shows an error: Error 61: Communications Failure Did you try all the various BMS options, such as LIB? There are half a dozen or so. Quote My cable wiring: That seems correct, as long as the two green wires aren't swapped around. I can't make out which ones have the white bands/stripes. Quote Didn't i do it right. Inverter side 3 RS485 B Battery pcak 5 RS485 B , Inverter side 5 RS485 A Battery pack 6 RS485 A Hopefully I gave you the right directions. It's entirely possible that your battery just isn't one of the many supported ones. Edit: BTW, I don't believe you had to downgrade the removable display from 02.61 to 02.60. Though as you have them, it's presumably a known-good pairing. Edited March 16, 2021 by Coulomb Quote Link to comment Share on other sites More sharing options...
tonio Posted March 16, 2021 Author Share Posted March 16, 2021 The updates were in pairs. The LIB I tried has the same warning. I'll try them all. I write the result. There will be no bugs with version 2.61. The main processor version 91.20. The connection is now visible. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 17, 2021 Share Posted March 17, 2021 8 hours ago, tonio said: The connection is now visible. It looks correct to me. Quote Link to comment Share on other sites More sharing options...
tonio Posted March 17, 2021 Author Share Posted March 17, 2021 Bad news. Manufacturer replied. Because we do not have protocol of this inverter. Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 17, 2021 Share Posted March 17, 2021 2 hours ago, tonio said: Manufacturer replied. Because we do not have protocol of this inverter. Sorry, the inverter manufacturer or the battery manufacturer replied? With half a dozen protocols on the inverter, some really well known like PylonTech, surely the battery manufacturer could support one of them. Quote Link to comment Share on other sites More sharing options...
tonio Posted March 17, 2021 Author Share Posted March 17, 2021 The battery pack goes into sleep mode in the morning. PV turn on the battery pack. I draw the circuit. But the PV of this is only 145 V. The AXPERT VM III PV 450V. Do you think i give the value of the parts well? Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 18, 2021 Share Posted March 18, 2021 16 hours ago, tonio said: The battery pack goes into sleep mode in the morning. Why? Is this what you want? Your schematic translation seems reasonable, though you'd have to be very careful with spacing and voltage rating for the various parts. 450V on a printed circuit board, or some sort of breadboard, is tricky to make safe. The battery trigger port would have to be isolated, and capable of handling some 800V of peak voltage with respect to earth (the 450V DC plus something like 340V of superimposed half-wave AC). I would definitely not recommend it. Is there some way to prevent the battery from sleeping? Quote Link to comment Share on other sites More sharing options...
tonio Posted March 18, 2021 Author Share Posted March 18, 2021 Unfortunately no, he goes to sleep mode. Only PV can wake you up. Or manually every morning. The first picture shows the factory circuit. Today i tried the 5v trigger and it started. Or a small PV panel, just for the trigger. No need to worry about 450 VDC. Quote Link to comment Share on other sites More sharing options...
Chris999 Posted April 12, 2021 Share Posted April 12, 2021 On 2021/03/18 at 8:45 AM, tonio said: Unfortunately no, he goes to sleep mode. Only PV can wake you up. Or manually every morning. The first picture shows the factory circuit. Today i tried the 5v trigger and it started. Or a small PV panel, just for the trigger. No need to worry about 450 VDC. Dumb question, but are you discharging the battery completely to the point of under voltage cut out or does the battery disconnect in a 'power saving' mode when the is no load? I would assume if the latter is the case, this mode could be disabled via software in the battery. Does anyone know if there are communication protocol docs available for these batteries? Maybe a diagnostic application (can be sniffed)? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.