October 15, 20241 yr Hi I am new to the forum I have a Growatt inverter Spf 5000 es with a NEnergy lifepo4 battery How do I get the battery and the inverter connected through bms don't know what the dip switches must be on or what the protocol setting must be on is there anyone who might know what they might be Thankyou
October 15, 20241 yr The only sure way to get a BMS comms is to have the tech data from Nenergy as to the RS485 or CAN pins for the RJ45 connector. You also need to find out from Nenergy if it can communicate with Growatt and whether that would be on RS485 or CAN. Once you have that data, then you need to establish which communication protocol is applicable for the Nenergy. Growatt comms protocols are L01-L50 for RS485 comms and L51-L99 for CAN. In the absence of this info, you will have to use the USE or US2 mode and set your battery parameters manually. The attached thread has a user manual that was attached by one of the Forum members. That seems to indicate a 1 to 1 pin connection with the Growatt, i.e. a standard LAN cable. If that is true, then you will need to experiment by finding the correct comms protocol. Perhaps start with 52 as that is a common one used which is based on Pylontech protocol. It will be a hit and miss to find the correct one if Nenergy is unable to advise which one. Also see this thread. Edited October 15, 20241 yr by zsde
December 4, 20241 yr Hi, I have the same setup and got success with a straight LAN cable connected between inverter and battery CAN. Selected 05 for Lithium and protocol 52 and it works after 20 seconds. My problem is the Nenergy battery every 2 or 3 days instantaneously measures 1% SOC and uses Eskom to charge back to 50% irrespective of the battery SOC at the time. Was lucky to be home when it happened and the battery 6 SOC LED's correlated with the Growatt battery SOC so I'm more convinced it is the actual battery BMS and not the Growatt algorithm. Has anyone had this with their Nenergy battery? Anyone got a manual for this battery?
December 4, 20241 yr 1 hour ago, Jumbo said: Hi, I have the same setup and got success with a straight LAN cable connected between inverter and battery CAN. Selected 05 for Lithium and protocol 52 and it works after 20 seconds. My problem is the Nenergy battery every 2 or 3 days instantaneously measures 1% SOC and uses Eskom to charge back to 50% irrespective of the battery SOC at the time. Was lucky to be home when it happened and the battery 6 SOC LED's correlated with the Growatt battery SOC so I'm more convinced it is the actual battery BMS and not the Growatt algorithm. Has anyone had this with their Nenergy battery? Anyone got a manual for this battery? A lot to comments on in this graph, that sudden increase and then the immediate decrease at 2am is odd (potentially pointing to cell imbalances) Then at about 9 am, just as the battery is starting to charge at higher amps (presumably PV picking up?) there is a sudden 20% odd jump in the SOC (also pointing to cell imbalances, the movement seems to correlate in magnitute to the movement at 2am) If I had to venture a guess, the SOC readings are probably incorrect and not correlated to the actual cell voltages of the individual cells (or perhaps one of the cells is not balanced to the rest of the cells). So when the SOC drops to 1% it is likely that the battery is indeed flat (or at least one cell has reached the low Volt cut off) which then forces a recharge, cycle then repeats it self every x days. My guess is the cell imbalances means that the battery never really reaches 100% SOC, it only reports 100% SOC as one cell has likely reached the overvoltage level (while the rest of the cells are likely at a lower SOC level). As soon as a cell overvolts the BMS will report that the battery is at 100% SOC while the true SOC gradually drops over a few days until the battery is flat. To determine what is going on here you need access to the individual cell voltages. A lot of guess work in here, take it with a pinch of salt. If you do get to the answer, please post it here would like to see how far of the mark my guess is. Edited December 4, 20241 yr by I84RiS
December 5, 20241 yr Thanks for the reply. Here is the incident which i was around for. I had made a change to keep the battery at 100% SOC by selecting SUb on Growatt hoping the all cells would reach balance and it still drops. From the screen on the battery, i also got the cell voltages (15 cells) and opened the battery to measure and confirm (incase the BMS readings were out). Also checked all connections, pushed and pulled on all wires, plugs, etc to see if I could trigger the drop, no luck.The Growatt battery SOC reflects the battery BMS each time. Hope this helps......
December 6, 20241 yr On 2024/12/05 at 5:19 AM, Jumbo said: Thanks for the reply. Here is the incident which i was around for. I had made a change to keep the battery at 100% SOC by selecting SUb on Growatt hoping the all cells would reach balance and it still drops. From the screen on the battery, i also got the cell voltages (15 cells) and opened the battery to measure and confirm (incase the BMS readings were out). Also checked all connections, pushed and pulled on all wires, plugs, etc to see if I could trigger the drop, no luck.The Growatt battery SOC reflects the battery BMS each time. Hope this helps...... Are those volt readings at resting or under load?
December 6, 20241 yr They were while the SOC was being increased from 1% to 50% after the massive drop......
December 7, 20241 yr 8 hours ago, Jumbo said: They were while the SOC was being increased from 1% to 50% after the massive drop...... I would remove the BMS communication and use/test using AGM setting or something similar (set up the charge voltage and current using battery manufacturer recommendations) Unfortunately you would then have to keep an eye on the battery to keeping track of those cells voltages and sudden changes in the SOC led indicators to see if the issue reoccurring. Also check what happens to those voltage readings when under low, medium and high load. Do they uniformly drop when the increased load is introduced and then uniformly increase when load is reduced again? Edited December 7, 20241 yr by I84RiS
December 8, 20241 yr 13 hours ago, Jumbo said: Thank you for your advice, will give it a try. Cheers To be honest i do not have faith in the Nenergy battery modules. I did a tear down on the 8 cell 100ah( allegedly) as i found plenty of disappointing discoveries. Seeing you have opened the battery module the changes of warrenty claim are slim... but this gives you opportunity to scrutinise and fix the module. 1. Discconect all 15 cells and individually top balance each cell but check for swollen cells first and replace them. 2. Remove the bms and replace with a 8~ 16s JK bms.( The bms i removed was fried) 3. Remove the mcb and replace with dc rated mcb. Below results achieved after the 8s module overhaul and still going strong, i replaced 2 of the 8 cells due to swelling. Also replaced the original bms( no idea what make it was) The total capacity at the end of the day is actually 70ah 1792wh confirmed by the JK bms instead of the 100ah 2560wh stated on the rating plate. Results after 4 days. Ac Mcb replaced. 200A Jk Bms replaced. Top balancing individual cells. Edited December 8, 20241 yr by TaliaB
December 13, 20241 yr 2 hours ago, Jumbo said: Thank you for your reply, who sells the bms and cells, thanks. I bought the bms and lifep04 cells last year from: https://lithium-cells.co.za/home
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