Buck Gizmo -Volts vs Amps ? UPDATED
Update 5 Nov. (It didn't work out as hoped) I got my little gizmo, see close-up photos here http://www.ebay.com/itm/DC-DC-15A-Converter-Buck-Adjustable-4-32V-12V-to-1-2-32V-3-3V-5V-24V-Step-Down...
Forum Discussion
jrnymn7 wrote:
Thanks for clearing that up for me. Like you said before, lots to learn about solar.
Except now I am confused about that 60v x 20a =1200w thing because if you make the output voltage higher, then the output amps would have to be lower, so if 20a is the upper limit for output that would have to be at less than intake voltage. Arrggh!
So the 20a must be an intake limit in which case you could get more than 20 out when you buck? Have to look at that $105 job's specs some more.
Anyway the solar panel as DC supply has a low amps, high voltage structure for its watts, so you size the controller on expected output. The "20a" MPPT controller and my 230w panel gets about 34v in (Voc 37 reduced by hot temps to 34) and 8.3a Isc in unless in MPPT. It bucks that to battery voltage and is doing about 15 amps out at battery voltage in the 13s. The lower the battery voltage (lower SOC), the higher the amps. JiminDenver says his gets 17a or so with low SOC and high insolation up at his mountain top site.
