Regretfully this Project has run into problems and solutions have yet to be found. Despite having has some PCBs professionally assembled, testing has been problematic with unreliable results that almost certainly are attributable to shortcomings with the board layout and particularly with insufficient attention to decoupling of the ESP8266 supply. Also for reasons unknown there is a wide variation in the current drawn from the supply by individual units. Currently I'm trying to decide whether to redesign the PCB layout to accommodate improved supply decoupling (this would mean the expense of fabricating and assembling the boards) or whether to completely start again and build using commercially available components, namely The Adafruit Solar Charge Controller, a Huzzah ESP8266 module together with standard Boost Converter and H Bridge Driver sub-modules. The larger Waterproof Box required would facilitate the use of a more powerful Solar Panel as it has been ascertained that the existing panel is insufficient to keep the battery cell charged. I still have one or two things to try before deciding but it looks increasingly likely that a new solution that will not involve attempting 'hot plate soldering ' of QFN components or awaiting deliveries from China is preferred.