Ok here are some nicer graphs :) The PD's profile resembles the first one on page 4 of 6 at the bottom here, while other brands with actual 'constant amps' in Bulk have the profiles shown below that first one.
http://pdf.wholesalesolar.com/battery-folder/charging_instruction_2011_2.pdfThere is no harm at all in having constant amps in Bulk. It is a recommended profile that many chargers use. For an explanation of that, see Barre's book here:
http://www.bestconverter.com/Books_c_67.htmlRJ's set-up works for him so it is a good set-up for him. Nobody should expect that his set-up would be a good one for anybody else unless they camp the same way in the same places.
The forum provides lots of examples of what others do that can be cherry-picked for what would apply to your own situation.
BTW, the constant 55 amps as a power supply but not as a battery charger is not unique.
My 55 amp Parallax 7355 single stage 13.8v converter ran at a steady 56 amps in a test when it was backing up a battery bank supplying 110 amps to an inverter running a microwave for instance. But the same converter could only do 35 amps at most to the same battery bank on the same wiring and those amps tapered down quickly from there.
The constant amps in Bulk while battery charging requires more from a converter. Salvo on here has explained why the PD can't do it because of some circuitry limitation it has. It can still be a good converter choice for a set-up if your situation is ok with that.
Each brand of converter has its pros and cons for its regular line up. I don't like any of their charging profiles--I want mine to do like the second graph above shows, except at a higher charging rate for less generator time.
