OK, lets see what he says, I asked for a price for three and six. I'd like three, with your two that leaves just one remaining unless he can find more. Edit: Yes, I understand they are CV, if I set the voltage somewhere between 1.8 to 1.9 VDC out I should get at least 30 watts out of my FAP.
If these regulators are 95 percent efficient, and I use them with 12,000 mA/12 AH of Li-ion battery capacity at 8.4 VDC, at 25 amps of draw at 2 VDC from the regulator, I'm expecting to only draw roughly 25% or so of that amount of current from the 8.4 VDC series parallel battery stack, or a bit more than six amps, that ought to allow the battery supply to last a long time. Initially, I was thinking the Enersys Cyclon 2.0 VDC lead acid battery was the way to go, but that will only last 15 minutes at full power with their 25 AH battery drawing 40 some amps and that battery is heavy, using a stack of series-paralleled Li-ion batteries is much lighter, more compact and will have twice the run time when pushing the FAP harder than 30 watts of output pwer, not that I'd run it anywhere near that long, it is good to have the capacity so recharges aren't needed so much.
This switching regulator, even if it isn't CC, is a better way to power the FAP800 than straight off the battery at 2.0 to 2.1 VDC, as long as I don't run it harder than 30 watts out which is 2/3 its full rating and keep the voltage down below 2 VDC. Using a conservative duty cycle with good heat sinking in the past, I never saw the current creep up when using a lab power supply set to 2.1 VDC (without setting a CC limit), so I don't expect it will have a problem this way either.
Looking at the specs, it doesn't appear I need to worry about noise spikes, but have you scoped the output when you turn on the regulator?
