From: Phil Hopkinson [mailto:phopkinson@hvolt.com] 

Sent: Monday, October 10, 2011 6:22 PM 

To: Robert Berman; Richard Parker 

Cc: Caskey, John; Brian Coffey; Alex Hofmann; Andrew Delaski; Aris Marantan; Art Rosenfeld; Bob Saint; 

Bruce Smith; Caitlin Johnson; Carlos Gaytan; Charlie Drexler; Charlie Stevens; Chris Bolduc; Silcox, Clark; 

Creevy, Jim; Dan Cohen; Daniel Young; Eric Peterson; Freeman, Jeremiah; Gary Fernstrom; Greg 

Coulter; Greg Rosenquist; Hirsch, Bruce R; James Lass; Jennifer Tiedeman; Jerry Corkran; Jerry Hodge; 

Jerry Schoen; Joanna Mauer; John Cymbalsky; John Rossetti; Katie Coughlin; Ken Winder; Mahesh P. 

Sampat; Matt Miller; Matthew Nardotti; Meg Waltner; Meyers, Aaron; Michael Hyland; Michael Rivest; 

Millure, Dave; Phil Harter; Polinski, Raymond; Puesh Kumar; Rick Anderson; Rob Greeson; Robert van 

Buskirk; Robin Roy; Ryan, Paul; Scott Beck; Simmons, Chuck; Steve Nadel; Steve Rosenstock; Tim Ballo; 

Tom Eckman; Wes Patterson; Zhimei Luo; (rjstahara@centralmoloneyinc.com); Ali Ghafourian 

(aghafourian@ermco-eci.com); Ned Brush (Ned.efbrush@gmail.com); Dave Brender 

(dbrender@cda.copper.org); jay.ballard@schneider-electric.com; Kenneth.Harden@schneiderelectric.com; Tom Patzner (thomas.patzner@us.schneider-electric.com); Steve Nizinski 

Subject: RE: Distribution Transformer Loading and other Analyses 

Interesting comments Robert and all:

I look forward to seeing you all on Wednesday.  Some trivia that may be of interest to you is my own

home where I have recorded all kWH use and costs for the last 19 years.  My home has the following

characteristics:

1. 4500 square feet.

2. All electric

3. (3) heat pumps

4. (2) electric water heaters

5. The normal compliment of appliances and lighting.

6. During the colder years when my kids were home my total kWH of use was 36,000

7. Currently as empty nesters we are closer to 32000 kWH

8. I am on Duke Power’s system where the current average price of electricity to my home is 9.5

cents/kWH.

9. My simple average load today is 32000/8760 hours or 3.65 kW.

10. By my calculations below, my summer RMS equivalent load is 7.7 kVA

11. My winter RMS equivalent load is 8.2 kVA

12. My cold load pickup that would occur after a storm is 40 kVA
This loading pattern will be different in different parts of the country but probably of similar shape for a

good many homes.  RMS equivalent use is most influenced by the size and duration of the peak loads.  

For the US as a whole, the FERC 1 report shows a simple average of >20% of nameplate load.  It certainly

makes sense that the RMS equivalent will be considerably higher.

I have an 8 kVA generator which can handle peaks of 12 kVA but it cannot anywhere near power all of

my house and yet if the average were my only concern there would be no problem at all.

Best regards,

Phil

Philip J Hopkinson, PE 

President & CEO HVOLT Inc. 

3704 High Ridge Rd. 

Charlotte, NC 28270 

phopkinson@hvolt.com

Ph 704-846-3290 

Fx 704-845-2520 

Cell 704-236-3320 

www.hvolt.com

From: Robert Berman [mailto:bermaneconomics@gmail.com] 

Sent: Monday, October 10, 2011 2:40 PM 

To: Richard Parker 

Cc: Phil Hopkinson; Caskey, John; Brian Coffey; Alex Hofmann; Andrew Delaski; Aris Marantan; Art 

Rosenfeld; Bob Saint; Bruce Smith; Caitlin Johnson; Carlos Gaytan; Charlie Drexler; Charlie Stevens; Chris 
Bolduc; Silcox, Clark; Creevy, Jim; Dan Cohen; Daniel Young; Eric Peterson; Freeman, Jeremiah; Gary 

Fernstrom; Greg Coulter; Greg Rosenquist; Hirsch, Bruce R; James Lass; Jennifer Tiedeman; Jerry 

Corkran; Jerry Hodge; Jerry Schoen; Joanna Mauer; John Cymbalsky; John Rossetti; Katie Coughlin; Ken 

Winder; Mahesh P. Sampat; Matt Miller; Matthew Nardotti; Meg Waltner; Meyers, Aaron; Michael Hyland; 

Michael Rivest; Millure, Dave; Phil Harter; Polinski, Raymond; Puesh Kumar; Rick Anderson; Rob Greeson; 

Robert Berman; Robert van Buskirk; Robin Roy; Ryan, Paul; Scott Beck; Simmons, Chuck; Steve Nadel; 

Steve Rosenstock; Tim Ballo; Tom Eckman; Wes Patterson; Zhimei Luo; 

(rjstahara@centralmoloneyinc.com); Ali Ghafourian (aghafourian@ermco-eci.com); Ned Brush 

(Ned.efbrush@gmail.com); Dave Brender (dbrender@cda.copper.org); jay.ballard@schneiderelectric.com; Kenneth.Harden@schneider-electric.com; Tom Patzner (thomas.patzner@us.schneiderelectric.com); Steve Nizinski 

Subject: Re: Distribution Transformer Loading and other Analyses 

Richard, 

I have carefully reviewed the HVOLT analysis. Although I am not an engineer, and will not 

comment on particular engineering designs, I am concerned about a number of the assumptions 

made regarding electricity utility system economics as well as the transformer prices. The latter 

appear at odds with published market data and appear to misquote the DOE PTSD. As the 

analytical conclusions appear to be riven by the assumptions, it is important to put the 

assumptions in their proper context. Attached are my detailed comments.