The Concentrating Solar Hydrogen Generators (CSHGs) pictured here are the culmination of several years of work and incorporate all the best features and lessons learned from a progression through 4 prototypes.  The Dall-Kirkham optical design optimizes the flux delivered to our titania photoanode in the core. The optical design and materials are selected for the highest possible reflection and transmission of all the ultraviolet and blue available in direct sunlight.  The concentration ratio of 30X is optimum for our photoanode. The core is oversize in length so that there is no need to adjust altitude with seasonal shifts.  The sunlight simply slides up and down the core, without any light lost: in winter it is near the top, in summer near the bottom, and in the middle in spring and fall.  The stepper motor drive accurately tracks the sun, using under 15 watts of power which is delivered by an onboard photovoltaic strip.  Yet it can slew from any part of the sky to its self-protecting “home” position in less than 30 seconds.  Command-and-control sensors and software in LabView include a low-electrolyte sensor, temperature sensor, motor position encoder as well as absolute reflector position locator, and fine-positioning using photocurrent to maximize the flux to the core. Clear aperture collection area is 2.7 square meters.  A battery that also serves as the counterweight provides the backup power to re-acquire the sun even after long stretches of cloudy weather.    All materials are chosen for long life in harsh environments. The units have easily passed indoor cycling of the mount and drive to over 100 year’s worth of motion, showing little discernable wear.  The CSHGs shown here are mounted on our roof and have been cycling through the hottest days of summer and now one of the worst winters ever recorded in our area, with record snowfall, ice, low temperatures, and high winds.  They start easily every morning.   The CSHGs co-generate heat, because we run a cooling loop to keep the electrolyte from boiling (the pump is also powered by the on-board PV strip).  The radiator section of that loop can be used to heat water or air in a commercial building.  Further, these units can develop up to 50 PSIG.   As with our SHG50, at present we are not offering the CSHGs for sale. We are using them for accelerated testing of our photoanodes and other components used in the LFG80LH.  They can also be easily modified to purify water using our Visible Light Photocatalysts.