General Energy Use, Strategies and Systems

Energy Use:

Net positive – 3,146 kWh (Oct 12, 2011-Oct 12, 2012)
Warm in winter, cool in summer (without air conditioning)
Humidity level pretty constant around 35-40% RH
Very little backup heat required, portable electric baseboard unit used very infrequently
328 gallon solar tank water rose 62 degrees in one day (March 5, 2011 – 64 degrees to 126 degrees)

Zero Net Energy Definition Used Source Energy Use

Monthly Energy Data and Utilities

Energy Data Type:
Electric Utility:
Datasets and utility bills:
Datasets and utility bills sources and reliability:

utility bill data

Renewables and Energy Balance

Renewable Energy Sources:
Renewable energy is generated within the building footprint (e.g. solar PV on the roof)
Renewable Energy System Description & Details
5.88 kW, 28 Evergreen Solar ESA210 Fa-3 modules Estimated annual production 6,500 kWh, actual annual production 7,399 kWh SolectriaPVI5300 grid tied inverter Revenue grade meter TTi Flat Jack roof mounts Unirac SolarMount rails Installation by Alteris - now Real Goods Solar
Annual renewable energy generated 7,074 kWh
Annual Renewable Energy Generated Data Type Measured
Renewable Energy System Type(s) Source of Annual Production Data
Photovoltaics metered data

Annual Energy Import/Export

Electricity amount (imported from grid) 3,964 kWh/year
Net electricity usage (purchased electricity) -3,110 kWh/year
Electricity amount (credited or exported to grid) 7,074 kWh/year