Absolutely love my BMV-712 and all the data it provides, but I have a question on set up.
My battery set up is 4 Duracell Ultra 6V SLIGC125 (FLA) batteries in a 2P/2S configuration. Each battery is 235Ah, so at 12V, I'm at 470 Ah total. Using the 50% discharge rule of thumb, that gives me 235 "usable" Ahs.
In reading through the Victron manuals, it appears to employ this "50% discharge" rule of thumb as the default for FLA batteries (along with every other electrical variable imaginable, but that's another thread - who knew "Peukert Exponent" would ever come up while roasting marshmallows!), such that, I'm assuming, it would be built into the SOC calculation, given as a percentage of remaining battery life. The "Time remaining" calculation appears to use the "50% discharge" rule of thumb when I just eyeball out the current flowing versus the delta between 235 Ah and the displayed "Consumed Ah" number, but the SOC percentage seems way over stated. For example, if the "Consumed Ah" number is 100 Ah, then I should have 135 AH, or 57% of my "usable" 235 Ah, left. So I would think that the SOC should read 57% (if the denominator is 50% of my entered battery capacity of 470 Ah) OR the SOC should read 71% (if the denominator is my entered battery capacity of 470 Ah).
My question: Does the SOC measure the entire 470 Ah in my setup (such that I should be monitoring that down to 50% displayed SOC) or should I input the "usable Ah" of 235 Ah as the "battery capacity" in my BMV-712 settings, so that the SOC displays my "usable" battery charge left?
And they said there would be no math . . .!!!