November 6, 20232 yr I'm experiencing an issue with my Pylontech batteries while charging As background, I have a Deye 8kW Inverter, 3 banks of solar panels (3kW each bank), and 6 Pylontech US3000 batteries. What I've noticed for the last month or more is that the SOC gets "stuck" at 88% (as reported to the Inverter - both through the app and on screen), and then jumps to 100% about 45 minutes later. Has anyone experienced this before, or got any suggestions please?
November 6, 20232 yr I suspect one or more batteries in your bank has a wonky BMS and or Cell. Can you try switching one battery off at a time until the SoC reporting is normal? You'll probably have to adjust the dip switches etc to cater for it
November 6, 20232 yr This is 100% normal for Pylontech afaik. The cell balancers kick in at around 88-90% and then charging current drops, and the SOC gets stuck for up to an hour or more where it will suddenly jump and be "full". How long it does this for depends on the charging current and how out of balance the pack is. Have you not noticed this before? This is mine. Has done it from day 1. Edited November 6, 20232 yr by sgs
November 6, 20232 yr Author 21 minutes ago, madness_za said: I suspect one or more batteries in your bank has a wonky BMS and or Cell. Can you try switching one battery off at a time until the SoC reporting is normal? You'll probably have to adjust the dip switches etc to cater for it Thanks, I will try that (for safety's sake)
November 6, 20232 yr Author 1 minute ago, sgs said: This is 100% normal for Pylontech afaik. The cell balancers kick in at around 88-90% and then charging current drops, and the SOC gets stuck for up to an hour or more where it will suddenly jump and be "full". How long it does this for depends on the charging current and how out of balance the pack is. Have you not noticed this before? Thanks for the info, but no, I haven't noticed it before. What I did not mention is that I recently (about 3-4 months ago) upgraded my Inverter from an Axpert 7.2kW to the Deye 8kW I certainly didn't notice it during the Axpert era, and also not in the first month or so of the Deye time
November 6, 20232 yr 3 minutes ago, Peter_DM said: Thanks, I will try that (for safety's sake) Do this one battery at a time, one day at a time so you can get a clear view on the SOC. Will probably take you a bit longer than a week.
November 6, 20232 yr Author 6 minutes ago, sgs said: This is 100% normal for Pylontech afaik. The cell balancers kick in at around 88-90% and then charging current drops, and the SOC gets stuck for up to an hour or more where it will suddenly jump and be "full". How long it does this for depends on the charging current and how out of balance the pack is. Have you not noticed this before? I also hadn't thought of the pack balance, I'll disconnect and check the balance
November 6, 20232 yr Author 1 minute ago, madness_za said: Do this one battery at a time, one day at a time so you can get a clear view on the SOC. Will probably take you a bit longer than a week. Yup, I'll need at least 6 days of plenty sunshine to run this
November 6, 20232 yr 2 hours ago, Peter_DM said: I'm experiencing an issue with my Pylontech batteries while charging As background, I have a Deye 8kW Inverter, 3 banks of solar panels (3kW each bank), and 6 Pylontech US3000 batteries. What I've noticed for the last month or more is that the SOC gets "stuck" at 88% (as reported to the Inverter - both through the app and on screen), and then jumps to 100% about 45 minutes later. Has anyone experienced this before, or got any suggestions please? This is how the pylontech charge and perfectly normal.
November 6, 20232 yr This is how they charge for more than 4 years. 3 X Pylontech 3000 . Stay on 89% for 30 to 45 min depending on the charging rate .
November 6, 20232 yr 7 minutes ago, Chris Louw said: This is how they charge for more than 4 years. 3 X Pylontech 3000 . Stay on 89% for 30 to 45 min depending on the charging rate . If you look at OPs SOC graph, it's completely vertical to 100%, which is different compared to yours
November 6, 20232 yr 10 minutes ago, madness_za said: If you look at OPs SOC graph, it's completely vertical to 100%, which is different compared to yours Different programs make the graph look slightly different . This is 100% normal for Pylon's.
November 6, 20232 yr 1 minute ago, Nexuss said: Different programs make the graph look slightly different . This is 100% normal for Pylon's. Agree, Look at the time scale along the bottom, it's not vertical and it depends on the charge current. Edited November 6, 20232 yr by Tinbum
November 6, 20232 yr Can the Deye inverter display the SOC and cell voltages of each battery. Solarassistant gives a rapport of SOC and high and low voltages of all cells of al batteries. This should pickup bad cells or BMS fault.
November 6, 20232 yr 4 hours ago, Chris Louw said: Can the Deye inverter display the SOC and cell voltages of each battery. Solarassistant gives a rapport of SOC and high and low voltages of all cells of al batteries. This should pickup bad cells or BMS fault. Their is nothing wrong with his batteries. One of my stacks went from 89% to 100% in less that 30 minutes today. I've not even looked at my others. That would show as near vertical on his graph!! (EDIT another went from 90% to 100% in 9 minutes). Edited November 6, 20232 yr by Tinbum
November 7, 20232 yr Author I think @Nexuss may have hit the nail on the head here saying that different programs present the data differently Another switch I made recently was away from ICC and the various Inverter Apps to Home Assistant, so that may be a reason I didn't spot this phenomenon until now Thank you all for the info, I accept that this is normal behaviour for the Pylontechs It's really fantastic to have this level of knowledge & support available
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