Need Solar-v-Weatherization savings comparison graph

Hello all. I'm putting together a presentation on residential weatherization and would like to show a cost/benefit comparison between installing solar and weatherizing.  Has anyone seen a simple graphic showing this?  Thanks, Kris

Views: 231

Reply to This

Replies to This Discussion

I don't know how simple this question is. There is data on weatherization outcomes available, but there are a lot of variables, such as region of the country, who's in charge of the money and the work, type of housing stock, etc. Solar is going to vary too, because of differences in how much the sun shines and how much utility power costs.
Weatherization is where to start. I dont have figures but look at the cost to supply 50% of the energy needs of an existing inefficient house using solar verus the cost to reduce demand by 50%.  It wont be close.

To show the importance of efficiency first, I used to use an example comparing light bulbs to a PV system, as follows. But solar lease options on the market have changed the game, making little to no capital outlay and instant energy offset for some systems in states with utility rebates. I know this doesn't exactly answer your question. But maybe it's worth a thought. Efficiency first is the right thing to do, but solar has it's place too.


Ten (10) 100-watt incandescent light bulbs x 10 hours/day = 10kWh/day (3650 kWh/year)
Ten (10 20-watt compact fluorescent bulbs x 10 hours/day = 2 kWh/day (730 kWh/year)
                      Difference: 2920 kWh/year

One 2,000-watt PV system x 1.45 (*Boulder Colorado - www.pvwatts.org)
                               2,900 kWh/year

 

        $50 for a light bulb vs. $5000 for the PV array*
                        What would you do?

 

Nice, Eric.  This is the sort of info I'm looking for.  I appreciate your input.  Thanks, Kris

Having worked in both PV installation field and being an energy auditor I would say that this should not be raised as a question of one VS the other, they should go hand-in-hand, weatherization preceeding solar installation.

Also I would suggest considering solar thermal before solar PV.

This Study posted on the Northwest Energy Star site may be helpful.  It has case studies for four or five homes approaching net zero.  they summarize the cost of reducing energy needs along with the costs of adding renewables.  It also does a fairly good job of summarizing issues we run into when taking energy efficiency to the next level.

Hope this helps.

 

http://www.northwestenergystar.com/sites/default/files/resources/NZ...

 

RSS

Featured Forum Discussions

What causes a temperature plane in a home

Started by Energy Wise Solutions in HVAC. Last reply by Peter Krych on Friday. 4 Replies

Velocity Pressure Testing

Started by Horace Douglas Hunt, Jr. in General Forum. Last reply by Horace Douglas Hunt, Jr. Apr 15. 2 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Efficiency First California posted a blog post

Building a Clean Energy Future, Respect for the People Who Will Build It

You don’t need to spend a great of time deal in the policy world before you hear a conversation…See More
15 hours ago
Profile IconDavid G. Tamutus and Sharon Block joined Home Energy Pros
16 hours ago
Gary Reed added a discussion to the group Job Board
Thumbnail

HOME ENERGY ADVISORS WANTED (NEW YORK STATE: Saratoga & Glens Falls Region)

We are currently seeking experienced HOME ENERGY ADVISEOS to join the Jack Hall Plumbing &…See More
yesterday
Profile IconGary Reed and Kurt Shafer joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
Ron Sarrick liked Energy Wise Solutions's discussion What causes a temperature plane in a home
yesterday
Kurt Shafer added a discussion to the group Job Board
Thumbnail

Installers for Whole House Fans in Various Cities

Invisco Whole House Fan Company in Temecula CA sells the highest performance fans in history. The…See More
yesterday
Kurt Shafer posted a blog post

First Rooftop Whole House Fan for Homes without Attics

Eichler was one of the most famous Mid Century Modern home builders in the 50s and 60s. His homes…See More
yesterday
Travis Lundberg replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Do you still happen to have a blower door fan, frame and fabric still for sale?  If so please…"
yesterday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service