Page 49 - Zero Net Energy Case Study Homes-Volume 1

FORTUNATO HOUSE RENOVATION
CASE STUDY NO. 2
Renewable On-Site Energy Supply
The on-site solar PV system consists of twenty-six 250-watt panels made by SolarWorld, a U.S.- based company, for a total power production rating of 6.5kW (DC).
Even for a modestly-sized house, this is a not a large system for a house that is performing at ZNE, especially with two electric cars adding to the overall electric load. In fact, before the ac- quisition of the electric vehicles, the house was significantly net positive in its performance. It is a testament to the high energy efficiency of the design and operation of the house that the PV system can be so small and the performance is still ZNE.
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(Below) Rooftop solar PV ar- rays, with clerestory windows beyond that are at the top of central stairwell space.