• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
723 spring street – solar system case study v4
 

723 spring street – solar system case study v4

on

  • 378 views

723 Spring Str

723 Spring Str

Statistics

Views

Total Views
378
Views on SlideShare
378
Embed Views
0

Actions

Likes
0
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment
  • This template can be used as a starter file to give updates for project milestones.SectionsRight-click on a slide to add sections. Sections can help to organize your slides or facilitate collaboration between multiple authors.NotesUse the Notes section for delivery notes or to provide additional details for the audience. View these notes in Presentation View during your presentation. Keep in mind the font size (important for accessibility, visibility, videotaping, and online production)Coordinated colors Pay particular attention to the graphs, charts, and text boxes.Consider that attendees will print in black and white or grayscale. Run a test print to make sure your colors work when printed in pure black and white and grayscale.Graphics, tables, and graphsKeep it simple: If possible, use consistent, non-distracting styles and colors.Label all graphs and tables.
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings
  • What is the project about?Define the goal of this projectIs it similar to projects in the past or is it a new effort?Define the scope of this projectIs it an independent project or is it related to other projects?* Note that this slide is not necessary for weekly status meetings

723 spring street – solar system case study v4 723 spring street – solar system case study v4 Presentation Transcript

  • 723 Spring Street– Solar System Case StudyScott PhillipsOctober 8, 1012 723SpringStreet.com 1
  • Summary• The SunPower 8.64 kW system generated 10,429 kWhs and provided 55% of the of the annual energy usage• Based on BTU’s per square foot, 723 Spring Street uses 50% of similarly sized homes.• The net cost of the system after utility rebate & federal tax credit was $29,276 or $3.39/watt.• Year 1 Savings were $2,367 including an 11 cent/kwh renewable energy credit, first year total utility cost was $0, the simple payback was 12.5 years and the annual ROI equals 8%. 723SpringStreet.com 2
  • Home Construction & Design• 723 Spring Street was Ann Arbor’s first LEED Platinum house, constructed in 2007 by Meadowlark Builders.• The envelope of the home consists of ICF walls, SIP panel roofs and the home has geothermal heating & cooling.• Other efficiency factors include an energy recovery ventilator, recirculating hot water system, low flow water fixtures and solar powered window blinds.• 723 Spring Street scored a HERS Rating of 40, using approximately 60% less energy than a Code built home 723SpringStreet.com 3
  • SOLAR SYSTEM DETAILS• 8.64 kW system comprised of 36 SunPower E19/240 solar panels at 240 watts and 19.3% efficiency - Enphase Energy Micro-inverters.• The panels were mounted with UNIRAC SolarMount rail systems. RoofGrip Easy Feet mounts attach the rail system to the SIP roof.• The system also includes an Envoy Communications Gateway and web-based Enlighten monitoring website.• The system was installed in August of 2011 by Mechanical Energy Systems 723SpringStreet.com 4
  • SOLAR SYSTEM PERFORMANCE• Based on system design, the projected KWh production for was 10,301.• The actual production was 12,380 kWh or 120% of projection.• Peak daily generation was 53.7 kWh.• This chart displays monthly kWh actual production Vs. estimated. 723SpringStreet.com 5
  • ENERGY USAGE• Total energy usage for this twelve month period was 23,319 kWh.• The PV system provided 55% of annual electrical energy usage and 41% of total energy usage.• At 105M British Thermal Units (Btus) of annual energy usage, 723 Spring uses 65% of the energy of similar sq. ft. homes. 723SpringStreet.com 6
  • COSTS, REBATES & CREDITS• The gross invoice cost of the systems was $57,375 or $6.64/watt.• The DTE Solar Currents Program provided an up-front rebate of 2.40 per DC watt which totaled $15,552 and an on-going production incentive 0.11 per kWh.• Less the federal tax credit of $12,547 ($41,823 X 30%), the net cost was $57,375 – 15,552 - $12,547 = $29,276 or $3.39/watt.• This charts compares 723 Spring Street’s utility cost per sq. ft. for new construction, single family homes & similarly sized homes. 723SpringStreet.com 7
  • PAYBACK / ROI / REAL ESTATE VALUATION• Based on net cost of $29,276, generation of 10,761 kWh and savings of $2,367, the payback is 11.3 years & ROI is approximately 9%.• The annual savings of $2,582 is comprised of $1,398 in energy purchase reductions & $1,184 in renewable energy credits.• Based on research from Clean Power Research, this ROI & payback is slightly better than the U.S. annual average of similar homes. 723SpringStreet.com 8