I thought the Renogy monitor's "battery attenuation ratio" was just fractured English and might mean charging efficiency, but for fun I Googled the term and it is real!
Renogy: ("Battery Attenuation Ratio: After the battery Capacity cumulatively once per cycle, The capacity value is automatically changed according to this ratio.")
(I saw where they use "machine translation" )
Unfortunately the articles I read on that made no sense to me even when written in English.
"Attenuation" apparently just means losing capacity from rated full even when doing a discharge. The Ratio idea might be Peukert or maybe how many cycles before it is down to 80% as for LFPs--??? All very confusing.
My plan is to leave that setting alone and hope nothing bad happens :)
Charging Efficiency is related to internal resistance of the battery. This varies among battery types and SOC when being charged and discharged and by what rate of charging or discharging.
Best plan for monitoring would be to recharge to full as often as possible and get the monitor to say the batts are full at that time. "reset" or "synch"
If you are off-grid and never manage to get your batts full for a long time, but just have them go down and up then the monitor will go out of whack. Just have to be aware of that and do the morning voltage cross check as mentioned before. Eventually the voltage version of SOC will be your only guide and not the monitor's version of SOC
