The panels I bought did not come with built in blocking diode so I added one for each panel. I also added a P and N Fet pair so I can disable the solar panel to make an accurate battery reading while it's sunny. The board on the left is the low voltage cutoff and charge controller for the battery. Another view The current iteration of the device.
Building the solar panel mount Inside tupperware box for water resistance Inside enclosure; thermometer, barometer, hygrometer mounted outside box for accurate readings Inside box with horrible wire management below Complete view