I finally stopped playing around with all the parts (monitoring setup above) and wrapped up the 6V 3.7W panel, Minty, and solar lipo charger in a nice fluorescent blue acrylic housing. Along with a 6600 mAh battery, I can now charge the heck out of USB powered gadgets. See http://www.ransomhall.com/Pages/solbooster.aspx for more details of this build. I am going to create an Instructable for this and enter it in the Epilog laser cutter contest. I’ll post links when that is ready.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.