There is an issue that can happen with a battery stack that is configured in parralel, and this issue the batteries not staying at the same level of charge.
Causes:
Battery wiring is the most common cause, the cables that go from the batteries to the inverter need to be balanced perfectly so the resistance stays the same in the DC path.
In a battery stack, pos and neg wiring should always be on opposite ends, with no more than 3 batteries in a stack.
Some examples of correct wiring
How to fix
The way you can see this issue is by looking at the SOC lights on the batteries, they should all be very close to one another
You will receive errors such as High Voltage Alarm in your monitoring or you will find the battery won't charge past a certain level, like 80%
The solution is to turn batteries off, except the ones that are lowest and let them charge to the same level and keep doing this until they are all the same. You may need to reference this guide if you're having trouble connecting pylontech batteries: How to Install
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