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					Best Practices for Solar Hot
    Water Installations
Renewable Energy Vermont Partnership Program




                   6/1/2012
Best Practices
The best practices for solar hot water (SHW) installations can vary according to state, county,
and town regulations, as well as from installer-to-installer. This document is a reference tool for
installers to assure the safest, highest quality installations.

All solar photovoltaic installations must be installed according to the latest NEC Code
Requirements. To find a copy of these requirements, visit http://www.necplus.org.


Roof
Structural Analysis

      To ensure the suitability and structural integrity of any PV installation, a structural
       analysis should be conducted according to local permitting requirements and
       conditions.
      Prior to installation, an analysis of the roof materials and age should be completed.
      When conducting the structural analysis, potential wind loading issues must be
       considered

Racking, penetrations

      No use of dissimilar metals in fasting materials.
      Appropriate flashing for racking, penetrations and piping penetrations.
      Waterproof of all pipe penetrations to insure integrity of roof is not compromised by
       pipe penetrations. All roof penetrations must be properly sealed.
      Exposed solar piping should be water-resistant, insulated and protected against UV
       degradation
      Racked collectors should be installed according to manufacturer specification
      Exposed solar piping should be water-resistant, insulated and protected against UV
       degradation


Basement
      Securing any pipes must be a minimum of 10 feet vertically and 6 feet horizontally
      Solar storage tanks should be properly sized to square feet of collectors and must meet
       the requirements of the panel manufacturer
           o Generally 1.5 gallons per square foot for flat plate collectors
     Relief valve should be piped according to NEC code
     All heat-transfer fluids should be non-toxic and approved for solar application
     Electrical wiring must be installed according to code
     Mixing valve should be located in a position that should protect the user


Other
     Panels should be installed in a way that protects the panels
     Securing any pipes must be a minimum of 10 feet vertically and 6 feet horizontally

				
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