Kraus-Fabel Retrofit
Net Zero Renovation of Small Duplex Home in Cohousing Community
General Energy Use, Strategies and Systems
Energy Strategies:
5.9 kw PV array installed on south facing roof, grid-tied. There was already an existing solar hot water system on the roof, shared with the other unit of the duplex.
| Zero Net Energy Definition Used | Site Energy Use |
|---|
Monthly Energy Data and Utilities
Energy Data Type:
Verified
Electric Utility:
WMECO, Eversource
Other purchased Fuels:
No
Datasets and utility bills:
| Attachment | Size |
|---|---|
 Energy Performance Data for NESEA ZEB 2012 | 28.83 KB |
| Energy Use Before and After - Dec 2010 to Nov 2011 vs 2007 | 140.05 KB |
| Electricity Production and Usage 2011 | 114.07 KB |
| ZNE Presentation Board | 5 MB |
Datasets and utility bills sources and reliability:
Meters on building, reliable.
Cogeneration
Cogeneration System Description:
N/A
Kraus-Fabel Retrofit
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 |
|---|
| Photovoltaic System: • 28 Sanyo HIT 210 watt modules • Sunny Boy 6000US grid-tie inverter • Peak DC power: 5,880 watts • Peak AC power to grid: 5,150 watts Specifics below refer to the PV system, but there is also a solar hot water system serving the duplex (which was in place before the renovation): Solar Hot Water: • Collectors: Two Thermo-Dynamics G32 panels, 64 SF total (feeds 2 duplex units). • Solar loop circulator: Hartell MD-3-DCH, 18 watts, 12 VDC. • Solar storage tank: Power Miser-12 (Sears) 80 gallon. • Estimated annual production (for our duplex unit): 3.9 MBTU. |
| Annual renewable energy generated | 7,023 kWh |
|---|---|
| Annual Renewable Energy Generated Data Type | Measured |
| Power Rating | Renewable Energy System Type(s) | Source of Annual Production Data |
|---|---|---|
| 5,150Watts | Photovoltaics | Metered, gross annual production. |
Storage and Installed Capacity
| Energy Storage type |
N/A, grid-tied PV |
|---|---|
| Energy Storage Capacity |
Annual Energy Import/Export
| Electricity amount (imported from grid) | 5,116 kWh/year |
|---|---|
| Net electricity usage (purchased electricity) | 431 kWh/year |
| Electricity amount (credited or exported to grid) | 5,547 kWh/year |