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: 138

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

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Chad Mcaulife replied to Bart Nicholson's discussion Minneapolis Blower Door and Duct Blaster for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"I would be interested in the blaster!!!"
9 hours ago
Chad Mcaulife replied to Matthew P's discussion Needed: Gas Detector and CO Detector. What do you recommend?
"The new BPI standards require a Gas Sniffer which has a read out of the LEL.  The cheapest I…"
9 hours ago
Profile IconDavid I. Shepherd-Gaw, Craig Lane, Barry Martin and 1 more joined Home Energy Pros
10 hours ago
Craig Lane joined Sean Lintow Sr's group
Thumbnail

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what…See More
12 hours ago
Tom White posted videos
13 hours ago
Tom White's 2 videos were featured
13 hours ago
Elvin Frost posted an event

"Solar 101" Educational Seminar at Randolph Public Library, New Jersey

March 11, 2015 from 7pm to 8pm
Geoscape Solar will be providing a free Solar 101 educational seminar at the Randolph Public…See More
13 hours ago
Casey Gesell joined Diane Chojnowski's group
Thumbnail

News & Announcements

Share your news and announcements with the community in this group.See More
14 hours ago

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service