In SX Microcontrollers, SX/B Compiler and SX-Key Tool, John Kauffman wrote:

Solar cells can produce a spike voltage well above their rating. Getting data on that spike is part of what I am doing. So far, highest is 9 volts.

I used a voltage regulator to connect the solar cell to the bus (bus serves the solar cells, supercap (or NiMH) and SX board). William uses a zener which I will try next.

My solar array (pre-made 6volt unit) includes a diode for night time.

My goal is to get a solar-supercap system working, then figure how high of a duty I can support overnight & on cloudy days for SX wake/sleep   That will then determine how often I can wake up, grab data and go to sleep. A six second wake  every ten minutes gets the duty cycle to 1% and every ten minutes is still a good sampling rate for environmental data.

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