Grotman

Hallo.
I am jumping in here as your comment is the most relevant to my issue.
I bought a Pylontech 3000 that lasted 20 days.  Segensolar denied liability as "the battery overvolted".  I paid for a new BMS.  It lasted 4 days.  It sook it elsewhere (as I was hoping to get some expert opinion to take the seller on) to replace the BMS.  The BMS broke as the "battery discharge was too high".  (Fun fact:  The inverter cannot be set to control the discharge.)  This repair lasted 10 days.  
The relevant background is that my previous battery (a Pylontech US2000) ran without a glitch for three years with my Axpert 4KW/5VA inverter on the same settings.  Every time the 3000 broke, I would install the US2000 and it would run seamlessly.
I do not work with volts and amps.  I work with probabilities and credibility.  It is clear to me (at least) that the only differential is the battery (and not the operator, inverter or anything else).
I hope for the sake of everyone who has these problems, that some "expert" can figure out what the problem is so that a warranty does not need to be discretionary.
The wording in the Pylontech information sheet is clearly that the BMS protects the battery.  It is of little value if the BMS breaks every time it protects the battery.  Replacement is about R5000. 
I sit with a broken battery that I am dread to have fixed because there is absolutely no guarantee what the real problem is.
I would appreciate any insight.

I'd change the inverter!!

Is this "fit for purpose" as referred to in the consumer protection act?  I think not.  There is a need for a professional/expert to assist the purchaser in an action against a supplier.  The BMS is of no use if it protects the cells but breaks itself. 

Is this "fit for purpose" as referred to in the consumer protection act?  I think not.  There is a need for a professional/expert to assist the purchaser in an action against a supplier.  The BMS is of no use if it protects the cells but breaks itself. 

Is this "fit for purpose" as referred to in the consumer protection act?  I think not.  There is a need for a professional/expert to assist the purchaser in an action against a supplier.  The BMS is of no use if it protects the cells but breaks itself.