Sizing your solar system
How to improve efficiency: CFL, insulation, high-efficiency furnace, front-load washer, drying racks, whole-house fan, drapes, double-windows, discard older appliances, understand what’s using the most power: A/C, pool pumps, big-screen TV, etc.
Energy Audit: required good idea
Rule of thumb: 1 kW of solar per person
Daily kWh/5.5 = solar size
Example: 10 kWh/day appx. = 2 kW
Design is everything: expansion plans