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A. Hunter Fanney
Senior Research Scientist, Energy and Environment Division
Engineering Laboratory
National Institute of Standards and Technology
(301) 975-5864


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Monthly Result September 2013

During September 2013, the NZERTF consumed 863 kWh of electrical energy. The solar electric photovoltaic system generated 1400 kWh of electricity during the month. The difference between the energy produced by the solar photovoltaic system and the energy consumed by the NZERTF, 537 kWh, was exported to the electric grid. A graphical representation of the energy consumed and generated is found in the year to date results.

The following chart breaks down the total energy consumed by the house into the various end uses. For the month of September the greatest energy end use was for space conditioning, maintaining the house at 70 F +/- 1 F (21.1 C +/- 0.5 C), followed by plug loads, and appliance end use.

NZERTF energy use by category - plug loads, 195.6, lighting, 36.1, appliance, 159.6, hot water heater, 88.4, heating, cooling, ventilation, 382.9

A breakdown of the appliance end use into the energy consumed by individual appliances is captured in the following pie chart. During the month of September 2013 the greatest appliance energy usage was associated with the clothes dryer.

NZERTF energy use by appliance - microwave, 12.3, oven, 31.7, cooktop, 19.7, refrigerator, 36.0, clothes dryer, 45.9, clothes washer, 6.2, dishwasher, 7.8