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 201228.83 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
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 |