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Can you confirm BSL settings?

Hi. I have a Sunsynk 5kW Hybrid inverter with BSL 5.1 battery.

I am not sure that the inverter is correctly determining SOC as I observe it still feeding power to the battery when its apparently full - see 0.88-0.5kW charging when 100% SOC:

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I tried AGM V mode for some time and then switched back to Lithium mode. Interestingly, the moment I did that, the SOC displayed dropped from 80% to 60%.


I have checked that I have the latest BSL firmware and Sunsynk firmware. CAN connection seems fine. I gather the float and absorption voltage settings are moot as they're overridden by the BMS when in Lithium mode (in AGM V mode, I had them as 54.5 and 54.6 respectively).


Below are my current settings. Can anyone verify if these are correct for the BSL 5.1 battery? Should protocol be 0?

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Thanks

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Unknown member
Aug 31, 2022

If I were to revert to AGM V or AGM %, I find conflicting recommendation on the float and absorption voltages:


The BSL Manual v1.0 says (in Victron setup example):

- float: 54.8

- absorption: 55


But this page and this thread and my tech support said the opposite (for "Lithium" mode:

- float: 55

- absorption: 54.8


And I was advised that for AGM mode it should be:

- float: 54.5

- absorption: 54.6


Any advice, please?

TIA


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