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Residential Solar Retrofit: A Case Study on Energy Efficiency and PV Performance

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eagan-oneil
15 diapositives · 277 Views · Nov 30, 2014

This case study, authored by Shawn Fitzpatrick, P.E., examines a residential solar retrofit project, highlighting energy efficiency improvements and performance metrics of a 900 sq. ft. home built in 1949. The home underwent significant renovations, including a solar PV system installation with 21-year-old modules. The study details pre- and post-retrofit conditions, shading analysis using advanced tools like the Solar Pathfinder, and performance data showing solar generation relative to household consumption over the last six years.

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  1. An Example of Residential Solar Retrofit Shawn Fitzpatrick, P.E. Energy Engineer Advanced Energy September 30, 2014

  2. House Before Solar Retrofit

  3. House Description Before Retrofit • 900 sq.ft. conditioned space, 2 bedroom, 1 bath • Built in 1949 • No floor or wall insulation and poor R11 ceiling insulation • Single pane windows • Gas heat, Electric AC • Electric tank type water heater • Electric cloths dryer

  4. House After Solar Addition and Renovation

  5. How Bad will PV Shading Be?

  6. The Solar Pathfinder • Hemispherical reflection on dome is traced on sun chart with grease pencil • Similar new devices are electronic with digital camera

  7. Solar Pathfinder Shadow Trace • One trace gives information for every month and hour in the year • Add up unshaded percentages for each month • This gives the percentage of solar availability for each month

  8. SolmetricSunEye - Digital Shade Analyzer

  9. Calculation of Shade Factor from Pathfinder

  10. How Is the PV Doing? • PV modules are now 21years old. They were originally installed on a Duke Energy project in Charlotte, NC in 1993. • I installed my second-hand PV in February 2006 (~ 8 yrs. ago) • The average annual solar production for recent 6 years was 2067 kWh/yr. • Based on PV Watts software, PV was expected to produce 2290 kWh of electricity per year • PV production over last 6 years is within 10% of expected

  11. PV Generation and House Usage

  12. How Is the PV Doing? • PV generation has remained almost constant over 6 years (varied with weather) • House consumption has increased somewhat during this time but leveled out the last few years • 2007 PV generation equaled 87% of house consumption • 2012 PV generation equaled 56% of house consumption

  13. 2012 Monthly Solar Generation and House Usage

  14. Shawn Fitzpatrick, P.E.Energy Engineer Advanced Energy919 857-9032sfitzpatrick@advancedenergy.org