Solar Residence in Washington DC

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Chris Van Arsdale shares pictures and information from this solar installation on a townhouse in Washington D.C. This house produces electricity and hot water using solar panels. These two products are a result of photovoltaic solar panels and solar thermal panels.

This presentation was given December 4, 2009 at the Solar Energy Focus Conference: Fall 2009 hosted by the Maryland, DC, Virginia Solar Energy Industries Association (MDV-SEIA) in Gaithersburg, MD.

To learn more please visit:

www.mdvseia.camp7.org

Published in: Design, Technology, Business
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Solar Residence in Washington DC

  1. 1. 19th Street, NW DC
  2. 2. System Description: • 2.9 kw pv system • Gridpoint inverter/battery backup/ dashboard • 9 4’x10’ Helodyne thermal panels (DHW and radiant floor heating) • 6 80gal. water storage tanks
  3. 3. Energy Efficiency
  4. 4. Installation Issues
  5. 5. PV Total renewable produced (2yrs) 10,298 kwh Total Grid Purchased (2yrs) 20,538 kwh Energy production value $617/yr (avg) Total system cost (incl. frame) (after $15k DC grant) $19,000 Average annual ROI (without RECs) 3.2%
  6. 6. Solar Thermal • System cost (incl. frame) $28,000 • Avg. Annual Savings (heat) $928 • Avg. Annual Savings (dhw) $200 • Avg. Annual ROI 4%
  7. 7. Lessons • ROI without subsidy not great • Solar thermal for heating = maintenance hassle • Thermal system returns less than expected • Better option: Thermal for DHW/ More PV/ Ground-source heat pump HVAC

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