Battery Draw Bogus Math? Peukert UPDATE 2
Update- 11 Oct 20, Update 2- 12 Oct 20 Thinking one 100AH battery that can be drawn down to very low SOC gives you nearly the same "usable AH" as two regular AGM or Wet batts, as seen advertized, ...
Forum Discussion
Yes I am getting confused :(
Ok so the two 100AH batts banked at 200AH get down to 60% SOC so 40% got used of the 200 = 80AH.
But those AH are at the 20 hr rate of 10 amps for the 200AH bank. How long would that take? 8 hours!
So a 5 amp draw ought to take about 24 hours (three times the 8) to get down to 60% SOC (using the 20 hr rate for SOC)
I don't know if the bounce back would be to the same 60% as using 10 amps when you stop the draw---?
Meanwhile, the single 100 has the 5 amps running down to 20% SOC using 80% and that is 80AH taking 16 hours.
So it is 24 hours vs 16 hours for a 5 amp draw. Is that right?
BTW I see the SiO2 says 1200 minutes at 5 amps and 1440 minutes for 4 amps, but we don't care about that here since it is the two other batts in question for timing.
Ok so the two 100AH batts banked at 200AH get down to 60% SOC so 40% got used of the 200 = 80AH.
But those AH are at the 20 hr rate of 10 amps for the 200AH bank. How long would that take? 8 hours!
So a 5 amp draw ought to take about 24 hours (three times the 8) to get down to 60% SOC (using the 20 hr rate for SOC)
I don't know if the bounce back would be to the same 60% as using 10 amps when you stop the draw---?
Meanwhile, the single 100 has the 5 amps running down to 20% SOC using 80% and that is 80AH taking 16 hours.
So it is 24 hours vs 16 hours for a 5 amp draw. Is that right?
BTW I see the SiO2 says 1200 minutes at 5 amps and 1440 minutes for 4 amps, but we don't care about that here since it is the two other batts in question for timing.
