Couple of questions about DC-Dc charging
I've been thinking about adding a DC-DC charger now that I've added 400 amp hours of AGM batteries. There are lots of useful posts but I haven't run into a couple of things I'm curious about. One ...
Forum Discussion
Imagining some numbers:
Output Watts = 40a x 14.6v (just before Bulk ends) = 584w
Efficiency 85% (WAG--same as a typical converter) so
Input Watts = X amps x 14v (alternator output) = 584 x 100/85 = 687w
So at 14v input (no voltage drop) amps = 687/14 = 49 amps
With 1v drop, at 13v input, amps = 687/13 = 53 amps
So with some better info you could get closer for the amps.
Output Watts = 40a x 14.6v (just before Bulk ends) = 584w
Efficiency 85% (WAG--same as a typical converter) so
Input Watts = X amps x 14v (alternator output) = 584 x 100/85 = 687w
So at 14v input (no voltage drop) amps = 687/14 = 49 amps
With 1v drop, at 13v input, amps = 687/13 = 53 amps
So with some better info you could get closer for the amps.
