October 3, 20223 yr Quick question for those who run Pylontech stack with different battery models. Recently I upgraded my stack with 2 x US3000C and I run a total of 8 batteries. One US3000C is master and rest slaves. All runs ok , no issues. I have upgraded the firmware on all so they all run same level of firmware. From the inverter I run 2 x 50mm2 wire in 2 splitters and from there I go with 2 x 35mm into 2 x DC Breakers. So I run with 2 sets of wire for feeding the pylontech. 2 Power Wires on top battery and 2 power wires on bottom battery. All good , all ok but I noticed one thing (this could be normal behavior as last 2 pylons are only 2.4kw model) , when discharging or charging they will never charge or discharge equally. Not even the US3000C will have "equal" (or almost equal) level of charge discharge. Normal or I am being paranoid again ? First 6 packs are US3000C , last 2 are the US20000 This is in the afternoon when I start discharging , in the morning the diference is bigger.... like one US3000C is at 50% , one at 45 , one at 40 ... randomly , not in a certain order.
October 4, 20223 yr I cant quite tell properly, but from what you say, it looks as if the order of your batteries may be incorrect which may cause problems. You should be sandwiching the older batteries.
October 4, 20223 yr Author Yesterday I moved them around a bit .. hard work let me tell you ... we will see the following days.
October 4, 20223 yr There can be a difference in the SOC and it will sort itself out when you charge the stack full again. At least that is what happens on my Stack.
October 4, 20223 yr Author Re arranged yesterday and now charging. Curious how will look in the morning when they will discharge whole night.
October 5, 20223 yr 22 hours ago, Jaxone said: Curious how will look in the morning when they will discharge whole night. I see a similar thing on my stack of 5x US3000 (mix of B and C and different ages). I think it has something to do with battery age (cell health). All of your batteries are at the same voltage, but report different SOC for that voltage
October 6, 20223 yr Author After I swapped some of them around , things started to look better. At least the US3000 are closer to each other. Soon I will remove the last 2 of them which are US2000 and replace them with an US5000
October 6, 20223 yr Author I wanna remove the US2000 to replace them with an US5000. My rack is full so I can't add more units. Also the 2 x US2000 will get depleted faster than the US3000.
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