Research Project Summary Information
PV Shingle and Solar Load Controller Demonstration:PV shingle and solar load controller demo(ST6156)
AWS Scientific, Inc.
The Church of Saint Vincent DePaul is interested in installing a 4 kW photovoltaic (PV) shingle array as part of the roof for a new education building in Albany. The PV system will supply a portion of the building's electrical load for the air-conditioning equipment. The system would also incorporate the solar load controller (SLC) being developed under a separate NYSERDA contract with the Atmospheric Sciences Research Center (ASRC). The SLC makes small, short duration adjustments to the building's thermostat to better match the PV's output with the building's electrical load. This strategy allows electrical demand charges to be minimized when the PV system's output is reduced by passing clouds.
AWS Scientific will design the PV and SLC system for the new building, perform energy analyses to estimate the output of the system to confirm the projected cost savings, and procure, install, and commission the system on the building. AWS will also monitor the system for one year to evaluate its performance, and prepare a final report that documents the technical and economic performance of the system.
This effort will promote the use of a renewable energy supply and demonstrate how PV panels can be integrated into a building's roof to offset conventional construction.
The installed 4 kW system produced more than 3,700 kWh (approximately 7% of the building's total energy consumption) during a sub-optimal weather year for solar. It is estimated that the system would have produced more than 4,100 kWh during a typical weather year. Data was collected that demonstrated the SLC’s ability to shed load during times when PV could not meet its full peak shaving target, such as when a cloud passes overhead. The material cost savings from displacing conventional shingles with PV shingles was found to be too small (under $500) to significantly improve the cost effectiveness of this system. The cost to interconnect a small, nonresidential PV system at time of this project was found to be larger than expected. While this site was not eligible for net metering, it could have participated in a buy back program offered by Niagara Mohawk. Because this system was designed to meet the building’s base load, there were very few times during a month when there was excess capacity to be bought back. At the avoided cost rate of 2.3 cents/kWh, the excess capacity generated by this system was insufficient to cover the $15 monthly fee for participating in this program. The demonstration site elected not to participate in this program.
The system reduced the building’s demand by 2.2 kW over the cooling season. The system reduced the building’s energy consumption cost by $281 per year, and demand charges by approximately $18 per month, during the cooling season.
AWS Scientific, Inc.
255 Fuller Rd Ste 274
Albany, NY 12203
Energy Power Supply
NYSERDA Contact Information
R&D - Buildings Research