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: 188

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

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Amber Vignieri posted a blog post

Elevator David Becker Discusses Benefits of Time-Variant Pricing on CSIS Dream Team Panel

“Over $25 million have been saved in the state of Illinois since these programs started in 2007,…See More
2 hours ago
Marc Mondor is now a member of Home Energy Pros
5 hours ago
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Daniel,  Several years ago I was researching two different systems, one of which I almost…"
18 hours ago
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Rich, it always depends on site conditions, but generally speaking the 80% figure is a common…"
18 hours ago
Rick Causo posted a video

Swing Green GFX Drain Water Heat Recovery - GreenFoX

PowerHouseTV aired Sept 5 & 6, 2015. Segment 2 of the show highlights Swing Green, Inc. and the 4th generation of Drain Water Heat Recovery system, the Green...
23 hours ago
Matt Thornberry replied to Kim Tanner's discussion Game of Homes
"Thanks Kim! Game of Homes is an exciting new way to earn professional development credits for BPI…"
yesterday
Tom White posted a video

Enhabit: the non-profit that helps homes work better

Hear from homeowners Sonia, Amy, Roberta and Ty of Portland, Oregon, and Andy of Beaverton, Oregon, about their experiences with Enhabit. Enhabit is a non-pr...
yesterday
Daniel Beauchemin replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan Antonioli, You can use a ThermoDrain, drain water heat recovery to preheat your water and…"
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service