time2roll wrote:
BFL13 wrote:
Little math exercise:
ASSume 85% efficiency for Iota and PD, and Iota at its 14.8 while PD at 14.4, each at 40 amps output. PD PF 0.7, ASSume same for Iota.
14.8 x 40 = 592w out, so at 85% = 696w in, so at 0.7 = 995VA
14.4 x 40 = 576w out, so at 85% = 678w in, so at 0.7 = 968VA
I read plenty of posts where PD will NOT produce rated amps at 14.4 volts. About 10% less.
That's why the example uses 40 when he has a 45 PD. Also I can't find an Iota 40. They do have a 30 and a 45. If you meant an Iota 45 on the Honda 1000, that puts it even more above the 900VA rating.
14.8 x 45 = 666w out, so at 85% = 783w in, so at 0.7 = 1119VA
There were a couple of posts where guys got their PDs to do rated amps, but they had exceptional set-ups for wiring and good 120v inputs. Salvo used to say PDs have some sort of design fault where they can't do their rated amps at constant amps for the whole Bulk stage like other chargers can. Others have confirmed that with theirs. People with PDs sure like them though.
