January 31, 20251 yr Hi guys, I've realized that my first Pylontech battery will be 6 years old this March, so I've pulled some stats on the SOH and Cycles to share together with my thoughts. CC = 52.5V CV = 52.5V 8x US3000 System SOH : 96 % Power Volt Curr Tempr Tlow Thigh Vlow Vhigh Base.St Volt.St Curr.St Temp.St Coulomb Time B.V.St B.T.St 1 50955 -260 23000 20000 21000 3390 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:53 Normal Normal 2 50965 -256 23000 20000 21000 3390 3400 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 3 50970 -260 23000 20000 20000 3392 3402 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 4 50948 -252 23000 20000 20000 3387 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 5 50969 -256 23000 20000 20000 3389 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 6 50975 -262 22000 20000 20000 3392 3400 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 7 50959 -268 22000 19000 19000 3391 3399 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal 8 50945 -260 21000 18000 18000 3388 3398 Dischg Normal Normal Normal 100% 2025-01-30 22:16:52 Normal Normal CYCLE Times : 267 CYCLE Times : 518 CYCLE Times : 521 CYCLE Times : 523 CYCLE Times : 529 CYCLE Times : 520 CYCLE Times : 511 CYCLE Times : 501 Â 8x US3000C System SOH : 98 % Power Volt Curr Tempr Tlow Thigh Vlow Vhigh Base.St Volt.St Curr.St Temp.St Coulomb Time B.V.St B.T.St MosTempr M.T.St 1 50890 0 22100 19900 19900 3387 3396 Idle Normal Normal Normal 100% 2025-01-30 23:52:12 Normal Normal 20600 Normal 2 50903 -203 22300 19900 20200 3378 3397 Dischg Normal Normal Normal 100% 2025-01-30 23:52:10 Normal Normal 21000 Normal 3 50897 -256 23300 19700 20100 3386 3396 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 21300 Normal 4 50906 -256 22300 18900 19300 3386 3396 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 20600 Normal 5 50895 -258 22000 19000 19400 3385 3395 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 20200 Normal 6 50896 -266 21900 18300 18600 3385 3397 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 19900 Normal 7 50896 -260 20900 17900 18200 3386 3395 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 19200 Normal 8 50901 -264 20600 17100 17500 3387 3397 Dischg Normal Normal Normal 100% 2025-01-30 23:52:08 Normal Normal 18900 Normal 9 - - - - - - - Absent - - - - - - - 10 - - - - - - - Absent - - - - - - - 11 - - - - - - - Absent - - - - - - - 12 - - - - - - - Absent - - - - - - - 13 - - - - - - - Absent - - - - - - - 14 - - - - - - - Absent - - - - - - - 15 - - - - - - - Absent - - - - - - - 16 - - - - - - - Absent - - - - - - - CYCLE Times : 140 CYCLE Times : 141 CYCLE Times : 246 CYCLE Times : 233 CYCLE Times : 240 CYCLE Times : 249 CYCLE Times : 249 CYCLE Times : 247 Â At a first look, it's not that bad with 96% SOH on a 6yrs old battery. But on the other hand, it's been 4% down for just roughly 500 cycles it made in that time. If linear, then after around 2500 cycles made in total, it will be at 80% SOH. If 500 cycles took me 6yrs then after 2500 cycles done in total the battery will be 30 years old. No way the battery will last for that long. Based on this, I would say that the battery will die of age well before it dies on cycles. What do you think? Youda Edited January 31, 20251 yr by Youda wording
February 1, 20251 yr 11 hours ago, Youda said: Based on this, I would say that the battery will die of age well before it dies on cycles. What do you think? 100% agreed , that's why i cycle my batteries down to 5% every day  This is something Will prowse was preaching since way back , he cycles from 0-100% for that reason. The fastest way for the batteries to pay for themselves is to use all your capacity every day (leaving a small buffer at the end if needed for loadshedding/grid failure depending on you usage)
February 1, 20251 yr I have 4x US2000 Plus (700 cycles) and 4x US3000C (around 400 cycles). Total SOH = 95% , on ICM I cannot see SOH per battery. Your figures look better, but I also cycle them more at least 0.6 cycles per day. Always running from DC. Â Â
February 1, 20251 yr Author 34 minutes ago, Marius2001 said: Total SOH = 95% , on ICM I cannot see SOH per battery. To be honest, it's not ICM's fault. AFAIK, for Pylontech only the master battery tracks SOH and it's System SOH. (CLI command "pwrsys") Newer models, for example US3000C, have a SOH Counter for every battery, but it's empty. (CLI command "stats" followed by a number of battery you want to query) Luckily, at least the Cycle Count is tracked per battery
March 6, 20251 yr I have some US2000, US2000C and US3000B. For all those, the SOH and cycle count are calculated with a simple formula (by the BMS)Cycle count goes up by 1 for every 50Ah discharged on US2000 (74Ah for US3000)SOH goes down by 1% for each 100 completed cycles.For a stack of Pylons the same logic applies - simply use total capacity and discharge.So, @Youda , your 8 x US3000B had a total of 3890 cycles on 30 Jan. Expect the SOH to drop to 95 any day now when the stack total gets to 4000 cycles.A note of caution: this is based on observations on my batteries, all of which have been treated very gently. They are all at about 700 cycles.I have one data point from an older US2000 that leads me to believe that the formula changes at 1000 cycles/90% SOH. The slope thereafter seems to be 0.6% SOH per 100 cycles (or 1% for each 166.7 cycles)- that will nicely get it to 60% at 6000 cycles that Pylon claims.The bad news from all of this: the Pylon's SOH is not an indication of how well the battery has been treated. It is simply an estimate of remaining capacity based purely on total cycles. This is very disappointing given that they have a very sophisticated chip (TI BQ34z100) in the BMS whose sole purpose is to accurately estimate SOH and SOC based on real measurements. Edited March 7, 20251 yr by Calvin
November 14, 2025Nov 14 On 2025/03/06 at 7:51 PM, Calvin said:The bad news from all of this: the Pylon's SOH is not an indication of how well the battery has been treated. It is simply an estimate of remaining capacity based purely on total cycles. This is very disappointing given that they have a very sophisticated chip (TI BQ34z100) in the BMS whose sole purpose is to accurately estimate SOH and SOC based on real measurements.Hi @Calvin you can see how well the battery has been treated based on the HV (High Voltage) and OV (Over Voltage) times in the "stat" command from the command line. The lower theses values are, the greater the state of the battery is. Cheers
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