The following stumper is presented in BPI's August Performance Matters e-Newsletter.

For this month's stumper, Ham Niles of Evergreen Home Performance provided this story about the home of a retired anesthesiologist and his wife in Maine.

"The couple lived in a home less than 20 years old. They had a tight house, solar hot water, under-floor heat, efficient windows, modern electric appliances for laundry, dishes and cooking, and a backup generator with a block heater and battery charger for when the power goes out, which it does frequently in this town on the coast of Maine.

The homeowners complained that there was high electrical usage that seemed out of proportion with their habits - as though they had a hot tub or AC running all the time.

We evaluated the house top-to-bottom, and found plenty of load - thirteen 90 watt can lights; several pumps for the under-floor heat; various phantom loads associated with printers, Tivos and a security system; but nothing that added up to the 12000 kWh the client was annually seeing. I recalled a story my boss told me about how to use the IR camera – and that led to directly solving the problem. What was it?"

Hint: Infrared of back-up generator (top left) and infrared of circuit breaker (top right).

Tags: BPI., Challenge, Chump, Matters, Performance, Stump, the

Views: 148

Replies to This Discussion

Its the block heater. 

I agree with Lain.  The block heater is on continuously keeping the block at a nice 121 degrees.  The circuit breaker assumably shows the active circuit to the block heater when the generator is on stand by.

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

Mst. Fatema Aktar is now a member of Home Energy Pros
6 hours ago
Robert Leone added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Blower Door Package for Sale

Hi,I am selling my blower door with extras as a package or individually. These items are used but…See More
13 hours ago
Profile IconRobert Leone and Richard Vito joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
13 hours ago
Richard Vito 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
21 hours ago
Richard Vito joined James Sayers's group
Thumbnail

Marketing Energy Efficiency

Sharing ideas, tools and examples of promoting energy efficiency to consumersSee More
21 hours ago
Richard Vito joined Allison A. Bailes III's group
Thumbnail

HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements,…See More
21 hours ago
Richard Vito joined Kyle Brown's group
Thumbnail

Wrightsoft - Manual J / Manual D

If you use Wrightsoft to calculate loads or design ducts, you likely have questions.  Get answers…See More
21 hours ago
Jim Gunshinan commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"I had a revelation while attending Bruce Manclark's session of duct leak testing at the Energy…"
yesterday
George J. Nesbitt commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"Blower Door; the 2007 test was a depressurization test, and the 2014 a pressurization test, which…"
yesterday
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Plan, plan, plan, plan. The 1st step to is to understand the house, how it's built, the…"
yesterday
George J. Nesbitt posted an event

High Performance Windows - A Panel of Experts at Pyramid Alehouse`

April 26, 2014 from 3pm to 5pm
Join a lively panel discussion on high performance windows. We'll cover some basics, as well as…See More
yesterday
Kaushal Bharath Raju replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Hi David, Thanks for pointing out Martin Holiday's article. I do not wish to engage in the…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service