JamesJudasPriest wrote:
ok, so the answer must be that the converter output voltage will drop as low as necessary to control the current. How else could it perfectly dial in 45 amp output into very thirsty batteries?
The converter's voltage stays higher than the battery's voltage as the battery's voltage rises. during this time (Bulk stage) the charger is "current limited" or else its current would go higher than 45.
When the battery voltage reaches near 14.4, which is now held constant, the battery itself will regulate the amps by the way its "acceptance rate" in amps falls as the battery's state of charge rises. That is your tapering amps during the Absorption stage.
See these charge profiles: scroll down to graphs
http://pdf.wholesalesolar.com/battery-folder/charging_instruction_2011_2.pdf
