Gjac wrote:
Yes, I know hes the right guy and I remember his photos, that's why I bought the B&D 40 amp charger, I also remember BFL's ugly graph on charging he posted but never quite understood it.
I just had to pull that graph up from my files.
The graph was actually quite well designed. Just not pretty.
The point of it was...
Given a 220 Ah bank of 2 - 12v hybrid batteries at 50 SOC...
the slower the charge... the longer the Bulk charge, but the higher the SOC once the Acceptance / peak voltage stage was reached.
The eventual outcome is exponential. The higher your bulk current, the lower the time benefit over the next lower charge rate increment.
At 35A - 177 minutes from 50-90% SOC
At 55A - 139 minutes from 50-90% SOC
At 70A - 129 minutes from 50-90% SOC
So one might roughly extrapolate that hammering the bank with another 15A (85A total)... might shave off another 5 minutes or so from the total time. Therefore there is little generator time benefit to anything beyond C/3.
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