Design Blueprint: Village Electrolytic Chlorination System — Build Specification Derived from the Solar Electrochlorination Sizing Paper

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. A complete build specification for an electrolytic village chlorination system that disinfects a 10.0 m3/day supply with no chlorine deliveries: a 50 Wp photovoltaic module (14.1 Wp by first principles) drives an undivided brine cell at 4.0 V and 3.53 A over a 4.5 h sun window, producing sodium hypochlorite at 10.0 g/L from salt and water. Derived from the source paper: https://doi.org/10.5281/zenodo.24108806. Design basis: tank dose 1.185 mg/L (demand 0.8 mg/L plus a residual of 0.385 mg/L after demand, so the far tap holds 0.3 mg/L after 12.0 h at a distribution decay of 0.5 per day); hypochlorite storage decay at 30 C — 2.0% per day, strength 0.868 after 7 days, useful life 11.0 days to 0.80 of initial — is the binding constraint, not energy, and forces a production oversize factor of 1.152, giving decay-corrected production of 13.65 g of chlorine per day at 4.652 kWh per kg, 63.5 Wh/day, 15.88 Ah/day through the cell, and 45.0 g of salt per day (16.43 kg/year) as 1.5 L/day of brine at 30.0 g/L. The blueprint specifies a 10 L vented, shaded product tank (9.56 L working volume for 7 days of autonomy), a brine vessel holding a 10.50 L seven-day batch, flow-proportional dosing at 118.5 mL of product per cubic metre of treated water re-scaled by measured product strength, hydrogen venting at the stoichiometric 0.96 L/h during production, a bill of materials in generic specification classes, an assembly sequence, the operating envelope including the 35.4 m3/day ceiling and the 1.27 kWh/kWp/day insolation floor with the 50 Wp module, critical checks tied to the dose and product-strength figures, failure modes including hot-storage decay, cell scaling, and cloudy-day shortfall, and a maintenance schedule set by the salt consumption and the decay limit. Nothing has been built or measured; every derived quantity is reproducible from the accompanying compute.py.