28 Apr '17, 11am

Revisiting Net Zero Energy

Water, lifecycle costs and financial/technology learning curves. by Dana Dorsett In homes that can meet Net Zero Energy with an array that fits on the house the biggest slice of the home energy pie is domestic hot water. That isn't going to change with a higher performance building envelope. But self-consumption of rooftop PV output directed toward water heating as the power dump is a dirt-cheap cost adder. (~USD$100/water heater). Maintenance costs of PV are near-zero, comparable in cost to maintaining window & door weatherstripping. At end of life after 20-40 years the replacement PV system is likely to be FAR cheaper (and more reliable) than the initial system, due to the dramatic double-digit percentage learning curve of PV technology, dropping ~20% in cost with every doubling of manufacturing / installations volumes. What costs $3/watt today is likely to cost under $0...

Full article: http://www.greenbuildingadvisor.com/articles/dept/musings...

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