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My naturally cautious nature leads me to ponder BMS failures because they are critical to any LiFePO4 battery build and are a single point of failure. AFAIK Mosfet based BMS may/could fail with the Mosfets stuck in a charge or discharge state thereby leading to unpleasant outcomes. Is this...

So something like this: With this wiring: And these steps to enable Bypass: The benefit of the Load Connect Switch separate from the Bypass Switches is that in the event of Grid failure, the Multiplus II will disconnect AC2 Out but it gives me the choice based on expected PV and battery SOC...

JKBMS B2A24S15P Readings for Cell 9 in the attached video are the culprit. Whilst charging with above 35 amps to 55.2v (3.45v/cell), the voltage is 'reported' to be widely fluctuating. Other cells also fluctuate but not to the same degree. 'Reported' because 2 different multi-meters across...

There is no load - not yet connected to Inverter/Charger. BMS is cool (about 24C). BMS is turned on. When turned off, I wouldn't expect to get any readings across the BMS.

Ghosty - what did your 'chap' (the mate of a mate :)) advise?

I have managed to at least get a quote for the installation that includes inspector approving. However, after me having agreed to go ahead with the quote, sparky has gone quiet for a few days. :(

Let us all know how it goes.

Have requested a DDP (Delivered Duty Paid) quotation from Cassie Wang at Shenzhen Qishou Technology via Alibaba messenger. This is the quote. 16 pieces EVE LF280K total price -- USD 1648 Shipping cost - - USD 390 Transportation mode - - DDP Shipping time - - 55-65 days DDP to Australia Total...

I am fairly sure the BMS would throw a tantrum with that. It is expecting 16 cells in sequence 1-16.

Is the reason for this statement that Cell 9 voltage is calculated by the BMS using measurement points on Cell 8 +ve terminal & Cell9 +ve terminal? Why would the reported voltage be erratic if they were not the same resistance/conductivity? I could understand it if the voltage was consistently...

I did ask a Licensed Electrical Inspector about switching the Neutral downstream of the MEN link & he said it was OK provided continuity with the MEN link was maintained. In the Victron VE Config software, I would be selecting the Grid Code 'Australia A - No N-Bypass' which maintains continuity...