Mex's Flash?
Does "Flash charging" mean we (some of us anyway) are wrong to hate it when the PowerMax or Iota converters drop their voltages so soon for the absorption stage? In another thread Mex says, "A flas...
Forum Discussion
Didn't see my question (poorly asked) answered. Try again here---
I can't get the battery voltage to spike to 14.8 as my Vmax unless I hit a 50% SOC battery with maybe a 45% charging rate or so. Lower charging rate will mean it accepts the charger's max amps steady (constant amps with current-limited charger) for a time and then it gets to 14.8 at a higher SOC later on. (The lower the charging rate, the higher the SOC before it gets to 14.8, and longer time before it gets there and vv)
I have a bank of four 6s, call it 440AH, and I can muster 155 charging amps, so that is a 35% charging rate. I will not spike to 14.8 right off, I would need more charging amps going in.
But let's pretend I have enough charging amps and generator to run that many amps on my size of bank so it does spike to 14.8 right away.
I got from above reply that bubbles will not start yet, but I know amps will be tapering at the constant 14.8. No problem so far for fastest charging.
The question is---how far up in SOC will the battery bank be by the time the bubbles are enough to reduce the voltage and so the amps?
I am worried that it might only be 70% SOC (half of a 50-90 done) and I am shooting for 90%. I think Mex is saying that since it is already gassing, some of the amps is being wasted making heat, so it doesn't hurt your charging time to reduce the voltage and lower the gassing.
BUT--then how can you monitor that you are still getting the 70-90 part done just as fast by using AH counting? You do have an AH counter (Trimetric) but you don't really know how much goes for heat either way ( leaving it at 14.8 or dropping to 14.2) so how do you know when you get to 90% and can stop the Gen?
Mex says try it at home and get some before and after measurements till you get it right, and then just use the same "markers" (times, etc) when actually doing this away camping, because it will come out the same.
Has anybody done this (including Mex if he has the data) with some examples of how far you got up from 50% SOC at the 14.8 before the bubbles got going so it was time to reduce the voltage?
If it was at 90% anyway, then who cares? But if it was at 70% then it matters for how you can get from 70 to 90 as fast as just leaving it at 14.8 and never mind all the gassing.
BTW this would be another great excuse for having the adjustable voltage charger, so you can lower the Vabs to whatever you want when you want! :)
I can't get the battery voltage to spike to 14.8 as my Vmax unless I hit a 50% SOC battery with maybe a 45% charging rate or so. Lower charging rate will mean it accepts the charger's max amps steady (constant amps with current-limited charger) for a time and then it gets to 14.8 at a higher SOC later on. (The lower the charging rate, the higher the SOC before it gets to 14.8, and longer time before it gets there and vv)
I have a bank of four 6s, call it 440AH, and I can muster 155 charging amps, so that is a 35% charging rate. I will not spike to 14.8 right off, I would need more charging amps going in.
But let's pretend I have enough charging amps and generator to run that many amps on my size of bank so it does spike to 14.8 right away.
I got from above reply that bubbles will not start yet, but I know amps will be tapering at the constant 14.8. No problem so far for fastest charging.
The question is---how far up in SOC will the battery bank be by the time the bubbles are enough to reduce the voltage and so the amps?
I am worried that it might only be 70% SOC (half of a 50-90 done) and I am shooting for 90%. I think Mex is saying that since it is already gassing, some of the amps is being wasted making heat, so it doesn't hurt your charging time to reduce the voltage and lower the gassing.
BUT--then how can you monitor that you are still getting the 70-90 part done just as fast by using AH counting? You do have an AH counter (Trimetric) but you don't really know how much goes for heat either way ( leaving it at 14.8 or dropping to 14.2) so how do you know when you get to 90% and can stop the Gen?
Mex says try it at home and get some before and after measurements till you get it right, and then just use the same "markers" (times, etc) when actually doing this away camping, because it will come out the same.
Has anybody done this (including Mex if he has the data) with some examples of how far you got up from 50% SOC at the 14.8 before the bubbles got going so it was time to reduce the voltage?
If it was at 90% anyway, then who cares? But if it was at 70% then it matters for how you can get from 70 to 90 as fast as just leaving it at 14.8 and never mind all the gassing.
BTW this would be another great excuse for having the adjustable voltage charger, so you can lower the Vabs to whatever you want when you want! :)
