Estimate the storage capacity required for an active solar hot-water system designed to supply the total needs for two four-person families, one living in Manchester, New Hampshire, where the latitude is 44+N, and the other in Albuquerque, New Mexico, at 35+N. The total collector area is 2.5 m². The heat capacity of water is about 4,200 J/kgC, and the hot-water supply temperature in both houses is 75C (140F). State and justify all additional assumptions made.