Dumb Question? Solar Panel Charging - Limit Current or Voltage or Both?

[Rftop]

@chipmc

For example, if too much current was attempted to be drawn, the voltage level from the panel would drop. Once it got to 5.08V, I believe the charge controller would start to back off on the current allowed to keep the voltage dropping further. Am I thinking about this right?

You are correct.
It's my feelings that batteryChargeCurrent is really only a factor if you're using a Li-Po size other than the standard'ish 1800-2200 mAh. You'll want to typically limit charging current to 0.5C, or 1/2 the capacity rating of the Li-Po.....so 900 mA is a good default setting for the Li-Po's that ship w/ Particle devices.

Also:
I seem to remember some squirrely test results when using USE_VIN_SETTINGS_WITH_USB_HOST, but all my testing was performed with the USB connector (not Vin).