one problem AKA "standard" is using system voltage
aka Nominal 12v panels, can be anything between 15~19v when working under load
with a VOC of 19~24v
and that doubles for 24v system panels using 72 cells
60 cell panels really are intended for grid tie systems and MPPT controllers to put power back into the grid
but I digress
you are correct, panels should be rated at the thruput amps at the acceptable max panel voltage
None of this******saying its a 30 amp 12v system controller with a 390w panel limit
thats not 30amp thats 23amps?
i wonder why the limit ?
so you can't hit the max amp rating ?
because its false adv and IT really is a 24amp controller ?
there is a "Solar30" from Renogy on Amazon
http://www.amazon.com/Renogy-Controller-Regulator-Battery-Charging/dp/B00BCTLIHC/ref=pd_sim_86_3?ie=UTF8&refRID=0MT6B4H9HFAP4KTS49FZIdeal for: 12V PV system: 24V for Max input 360W Solar Panel, 24V PV system :48V for Max input 720W Solar Panel
except for the color its identical to this one from windy nation
http://www.amazon.com/WindyNation-Regulator-Controller-Adjustable-Settings/dp/B00JMLPP12/ref=pd_sim_86_3?ie=UTF8&refRID=0C461R3C7DNV492GWASDwhich also says 390w panels
