Hi All 

I've got a 16 cell  lifepo battery with a jbd-up16s010-l16s-100a BMS conneced to a Growatt 500ES inverter. Setup is working fine, and I dont really have issue with loadsheding, but I am unhappy with the SOC reported from the BMS to the Inverter. 

Cells are new EVE 105 and the BMS is a jbd-up16s010-l16s-100a (official site is down)  https://www.alibaba.com/product-detail/JBD-Smart-BMS-36V-60V-48V_1600706175819.html

The BMS boasts automatic SOC calibration, ie according to the specs learns the capacity from use.

The inverter is configured to switch back to UTILITY on 65% SOC and back to Battery at 85%.
Charging of battery is set to SOLAR ONLY.

Communication is CAN.
 

My issue is best shown in the below SOC graph provided by the Growatt app:

The Inverter seems to report a fluctuating SOCy battery throughout the night, there is no charging happening from the Inverter and my consumption is low, especially in the first half of the graph, but the BMS (and I see this on the BMS display as well) seems to think the SOC low, then seems to change its mind and then reports an almost full charge. 

At all times, when I have checked individual Cell Voltage, its been over 3.2V, from my understanding the Cells are still full.

I was wondering if anyone has experienced similar issues ? 

I have tried BMS reset, and already reset Capacity to 105  previously, but the issue returns within a few days. Since the BMS indicator lights and the SOC reported by CAN to inverter match up I dont see the CAN comms as the problem.

Any advice from anyone ?  I looked at the other similar SOC tread too, to wondered if its a BMS going to sleep issue, but then why would it turn back on?

Or can anyone suggest another BMS with CAN support that actually works and is available in RSA?

Thank you for reading

Carl

 

 

17 minutes ago, Carl j said:

Hi All 

I've got a 16 cell  lifepo battery with a jbd-up16s010-l16s-100a BMS conneced to a Growatt 500ES inverter. Setup is working fine, and I dont really have issue with loadsheding, but I am unhappy with the SOC reported from the BMS to the Inverter. 

Cells are new EVE 105 and the BMS is a jbd-up16s010-l16s-100a (official site is down)  https://www.alibaba.com/product-detail/JBD-Smart-BMS-36V-60V-48V_1600706175819.html

The BMS boasts automatic SOC calibration, ie according to the specs learns the capacity from use.

The inverter is configured to switch back to UTILITY on 65% SOC and back to Battery at 85%.
Charging of battery is set to SOLAR ONLY.

Communication is CAN.
 

My issue is best shown in the below SOC graph provided by the Growatt app:

The Inverter seems to report a fluctuating SOCy battery throughout the night, there is no charging happening from the Inverter and my consumption is low, especially in the first half of the graph, but the BMS (and I see this on the BMS display as well) seems to think the SOC low, then seems to change its mind and then reports an almost full charge. 

At all times, when I have checked individual Cell Voltage, its been over 3.2V, from my understanding the Cells are still full.

I was wondering if anyone has experienced similar issues ? 

I have tried BMS reset, and already reset Capacity to 105  previously, but the issue returns within a few days. Since the BMS indicator lights and the SOC reported by CAN to inverter match up I dont see the CAN comms as the problem.

Any advice from anyone ?  I looked at the other similar SOC tread too, to wondered if its a BMS going to sleep issue, but then why would it turn back on?

Or can anyone suggest another BMS with CAN support that actually works and is available in RSA?

Thank you for reading

Carl

 

 

Have a word with @BritishRacingGreen if he has an interface module designed for the JK BMS with CAN comms. I am using the JK but with voltage settings.

Very weird what you find with what is a good BMS.

Just wondering what the required and correct Growatt BMS Protocol is for that BMS.
Perhaps it's a matter of not having the exact correct Protocol.
Maybe one way of testing would be to apply mode US2 without BMS comms. Set your voltages as per your cell specs in program 19, 20 and 21 for the cut off.
Then monitor the reported voltages to see if they reflect correctly.

Thank you @Scorp007 and @zsde 

I am relieved to hear that there are good experiences with the JDK BMS !  

The Growatt seems to have 2 presets for CAN, I tested both, and the first one works better than the second (think the second one is for pylontech). One reason why I don't think the issue is with the CAN protocol is that the Indicator lights showing SOC mirror what I see in the Logs from the Inverter. 

I think I will try the option to run it on user mode 2 as per ZSDE's suggestion, as this would then eliminate the CAN as a source of problems, then i can concentrate on the remaining mystery.

I'll provide feedback in a few days

 

 

 

1 hour ago, Carl j said:

The Growatt seems to have 2 presets for CAN

The Growatt Li Protocols actually have provisioning from 01 to 49 for RS485 comms and then 50-99 for CAN.
Which ones are active and which ones not, I dont know. My setup I use Protocol 52 which works with Pace BMS in the Hubble batteries.

In the meantime you can peruse this thread as well.

https://diysolarforum.com/threads/anybody-tried-new-jk-bms-with-inverter-communication-support.68964/page-4

 

Edited April 17, 20242 yr by zsde

6 hours ago, zsde said:

The Growatt Li Protocols actually have provisioning from 01 to 49 for RS485 comms and then 50-99 for CAN.
Which ones are active and which ones not, I dont know. My setup I use Protocol 52 which works with Pace BMS in the Hubble batteries.

In the meantime you can peruse this thread as well.

https://diysolarforum.com/threads/anybody-tried-new-jk-bms-with-inverter-communication-support.68964/page-4

 

This BMS with comms seems to be a great BMS. 

So I have been running the system as per @zsde 's suggestion, using US2 for the battery type and running the system without BMS comms - I made the change on the 19th, as can been seen in the screenshot attached.  As a result the battery is being used much more, (great to see proper discharge and thus use of battery), but I still see strange logs for the battery, below is logs from last night:

The inverter is configured to only charge with Solar, IE no charging from Utility, and yet I get the below output for around - > 3 am the battery voltage jumps up again. 
 

Either the Growatt is ignoring the Charge setting and using Utility to charge the battery, or the bms/battery is recovering its voltage from somewhere - even if it were ignoring it, I doubt it should be able to charge at such a rapid rate..

 

 

Possibly the only way to get a clear answer is to connect to the bms and see if the logs concur with the logs from the inverter. 
 

As per the suggestion, how would i find out which of the  50-99 for CAN settings would be right for this inverter to BMS protocol ? Is this CAN standard so non-standard ?

Thanks again for reading !

 

1 hour ago, Carl j said:

CAN settings would be right for this inverter to BMS protocol

That would be trial and error, unless either Growatt or JK can provide you with the correct Protocol number to be used.
Mine is 52, and I believe that is a Pylontech Protocol as well, but I stand to be corrected.

You can contact Growatt via one of these options to establish if they have the correct Protocol for you

https://www.amosplanet.org/contact/

Hi @Scorp007 - after the url was not working for days on end,  finally this page loaded, and I read the contents (only page 4 - the rest wont load) with great  interest.  ( https://diysolarforum.com/threads/anybody-tried-new-jk-bms-with-inverter-communication-support.68964/page-4)

The symptoms reported by the guy testing the  Growatt and Pylontech combination with the strange behaviour for fully charging and then not charging until almost completely discharged are very famliar, Previously I have had mand days where my battery completely discharges in the afternoon while i have the best sun orientation, but the Growatt inverter seem to refuse to charge the battery.

At least I feel a bit more sane with my issue, not why I'm unable to load any other pages from the diysolarforum, hoping for a solution on the last page. 

I will try to get support from the relevant manufacturers... . 
 

4 hours ago, Carl j said:

Hi @Scorp007 - after the url was not working for days on end,  finally this page loaded, and I read the contents (only page 4 - the rest wont load) with great  interest.  ( https://diysolarforum.com/threads/anybody-tried-new-jk-bms-with-inverter-communication-support.68964/page-4)

The symptoms reported by the guy testing the  Growatt and Pylontech combination with the strange behaviour for fully charging and then not charging until almost completely discharged are very famliar, Previously I have had mand days where my battery completely discharges in the afternoon while i have the best sun orientation, but the Growatt inverter seem to refuse to charge the battery.

At least I feel a bit more sane with my issue, not why I'm unable to load any other pages from the diysolarforum, hoping for a solution on the last page. 

I will try to get support from the relevant manufacturers... . 
 

The link you gave is working fine. It opens on page 4 but there are 15 pages in total. 

You can also follow this inverter on the YouTube off grid garage. Great information on it. 

So far Growatt have advised me to use :

 Protocol L01  for the BMS - I think that they mean 51.

Now just waiting on JBD support for their feedback. 

Also considering that my normal CAT-5 cable is not quite correct according to some opinions of the diysolar tread.   Will make  new cable too depending on JBD feedback.

 

 

4 hours ago, Carl j said:

Protocol L01 

That could mean RS485 instead of CAN?  
Hopefully JBD will provide some clarity