Under frequent draughts and floods, many rainwater harvests as terraced paddy fields, dam− constructions, reservoirs, ponds, tanks, rivers and underground pools become more important. And the rapid urbanizations changed its water supply with much chlorine, which caused many water purifier users at home tap, and much drinkers of bottle water. And with many water treatments as by hollow fiber membrane, the final method for gaining freshwater becomes populous as desalination of clean sea water with advanced facility and cost-down innovation and improvement of Reverse Osmosis membrane, in the regions with many shortage of drinking water. And today small scale RO systems work at household tap as “water softner”. This tool showed the practical desalination facility, as 1.0, 0.5, 0.25, and 0.1% salinity, with DC pump(60psi diaphragm, by 24V battery). With higher brackish raw water salinity, the more stronger vibrations were observed with smaller fresh water product. And the comparisons of battery charging facility by a new light and rollable photovoltaic sheet, a standard panel under sunshine condition and by commercial line, showed the practical uses with RO membrane with these photovoltaic chargers.