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BI PV Urban Scale Project Details
Name projectGrupe – Carsten Crossings
Year2008-00-00 (Start operation date)
PV applicationInclined roof - integrated: PV roof tiles
PV power total kWp
LocationRocklin, California
Latitude/Longitude38°47'26"N 121°14'8"W
© US Department of Energy

Project summary
The Carsten Crossings neighborhood is one of 9 developments within the 1,200 acre Whitney Ranch development located in Rocklin, California. The Carsten Crossings project consists of 144 three-to-five bedroom, 2-3½ bath homes on lots that are 6,000 square feet or larger. The Carsten Crossings home designs are inspired by traditional ranch homes built in the area. The homes are considered middle class and market for about $500 000. Grupe submitted the Carsten Crossings project for certification under the U.S. Green Building Council’s LEED-H pilot program and is marketed as a “GrupeGreen” development, with many green building options such as soy insulation.

Urban scale PV aspects
Whitney ranch is a 1,200 acre amenity focused master planned community. In addition to the Community Park and Ranch House, Whitney Ranch features an extensive network of hiking and biking trails, acres of preserved natural open space, and neighborhood parks. The Grupe Builders, Carsten Crossings section has received acclaim for th architectural integration into the ranch style homes. Orientation was not an issue with only 5% difference(decrease from latitude tilt) for annual energy production of the PV system orientations other than south at this latitude.

Special PV project info
PV architecture and building integration
Urban planning issues
Economical and financial issuesThe energy efficiency and PV measure packages were evaluated using DOE-2 to estimate the value in utility savings and net cash flow to the buyers. Average incremental costs for the Grupe Homes improvements range from $15,064 to $15,576 after rebates, depending on the size of the home. If Grupe were to pass all of the cost of the energy efficiency measures (with incentives applied) through to the buyers, the total costs would amortize over 30 years at from $1,203 to $1,244 per year at 7 % interest rate. Utility incentives, including Energy Star Homes and rebates for Energy Star dishwasher and fluorescent lighting, ranged from $1,025 to $1225 (depending on the number of light fixtures).
PV ownershipBuilding owner: Inhabitant. PV owner: Inhabitant. PV energy user: Inhabitant.
Tariffs and metering
Info on grid issuesThere were no specific grid issues. Pacific Gas and Electric has been interconnecting homes since California policy started in the mid 1990’s. The homes were design to exceed the aggressive California Building Energy Code, Title 24, by 36%. With the PV array when facing south the energy savings jump to 54% better than Title 24.
Other infoThe houses also qualify for the $2,000 federal energy efficiency 176 tax credit. California State PV rebates were taken by PowerLight and were included in the cost to the builder. The first year energy savings of $1,557 are projected, yielding a positive annual cash flow that averages $1053 for the various models and orientations. Including the PV systems, cash flow is still positive at $828 per year. Other project company: US Department of Energy Building America.
Remarks and recommended readingThe Carsten Crossings development is towards the back of Whitney ranch and yet has sold faster than the other developments.

Other project data
Type of projectCommercial project
Other relevant aspects
Start of PV project
Start operation PV system2008-00-00
Main project leading companyGrupe Homes
Main project contact person
Contact email
Contact address
Includes PV database projects

Urban district data
Kind of urban areaResidential - urban
Main building typesHouses - single house
New/Retrofit/AddedNew building integration
Main PV area address

PV systems
PV applicationInclined roof - integrated: PV roof tiles
PV power total urban project345 kWp
Number of dwellings/units144
PV power per dwellings/units2.4 kWp
Main PV system typesGrid-connected - demand side
Main PV module typesPV building elements - PV roof tile
Main PV cell typesCrystalline silicon - mono
PV module brand and typeSun Power/SunTile
PV inverter brand and typeXantrex

PV cost and energy production
Total PV system investment
Average PV modules only costs
Total PV energy yield3531 kWh
PV energy user owner

Projects websitewww.grupe.com
Other websites
Webpage Educational Tool

1. CarstenCrossings.pdf (language: English)

(bipv) building integrated pv