Blueprint: Solar Water Pumping with Elevated Storage Tank (from DOI 10.5281/zenodo.24108893)

Design blueprint for the battery-free solar water pumping system designed in the source paper (DOI 10.5281/zenodo.24108893): a 340 watt-peak photovoltaic array (two 170 watt-peak modules) driving a brushless pump directly, lifting 3.000 cubic metres per day through a 40 metre total head into a 6.67 cubic metre elevated tank (6.00 cubic metres usable, two days of demand) on a 7 metre tower, with gravity distribution at 0.687 to 0.895 bar at the taps. DESIGN BLUEPRINT - SIMULATED, NOT MEASURED - NOT BUILT. Sized on the worst month (4.2 peak sun hours): the array delivers 3.265 cubic metres per day against the 3.000 cubic metre demand, after losing 3.3 hours and 10.0 percent of the day's energy to the pump's 250 watt per square metre start threshold. Over 20 years the elevated-tank system delivers water at $0.263 per cubic metre in present value against $0.311 per cubic metre for a battery-buffered system with the same tank at ground level, a saving of $1,050.39 (15.4 percent). Full build specification: pump duty point (0.366 cubic metres per hour at 40 metres, 99.7 watts at duty flow, 817.5 watt-hours per day), array sizing and mounting, tank capacity, dimensions and tower, piping, valves and controls, installation and assembly sequence, operating envelope, tolerances as given in the source, failure modes (pump wear, tank contamination, dry running) and maintenance schedule. Quantities the source paper does not give are stated as unspecified rather than supplied. Every quantity is from the source paper or derived from its parameters by the accompanying compute.py (derived items marked). Civilian water and energy only. AI use disclosed: this blueprint was drafted and its calculations scripted with the assistance of Dave, an artificial intelligence assistant; the named author is responsible for the design choices and for publishing the design's limits at full size. No hardware was built or tested.