NOTE: Make sure you read the first three posts (in order!) before tackling the rest, or it could be confusing: Post 1 is Designing the future, Post 2 is Setting up the problem, and Post 3 is Estimating basic requirements.


Wednesday, October 04, 2006

Peak Oil Home Electricity Requirements (Part 1)

Returning to the Homestead Example Problem, it’s time to focus on figuring our electricity requirements. For this, it’s best to start by estimating high and then paring things down as we refine our design.

The following table is a rough estimate for a family of four in a 2000 ft^2 house.

Peak WattageUsage frequencyDaily energy (kWh)
Refrigerator6008 hours/day4.8
Microwave150010 min/day0.25
Oven50003 hours/week2.1
Stove (range)20005 hours/week1.4
Food processor3001 hour/week0.04
Slow cooker20010 hours/week0.29
Home heating3008 hours/day4
Water heating45006 hours/day27
Lights (halogen, LED)1303 hours/day0.4
Food processor3001 hour/week0.04
Computer2004 hours/day0.8
TV1254 hours/day0.6
Air conditioning (if required)6008 hours/day4.8
Deep Freezer60012 hours/day7.2
Ceiling fans (3)2008 hours/day1.6
Clothes washer12001 hours/day1.2
Dish washer3001 hour/day0.3
Clothes dryer50001 hour/day5
Cell phone52 hours/day0.01
Computer2004 hours/day0.6
Vacuum cleaner12001 hour/week0.17
Power tools10002 hours/day2
Toaster100010 min/day0.17
Stand mixer3001 hour/week0.04
Misc. (clocks, radio, etc.)2004 hours/day0.6
26,720W (This is HUGE!)64.4 kWh

Please note that I am not advocating the use of any of these items – I just want to give a complete list of the most common appliances we use today. If you choose to use a dryer instead of a clothesline, or a dishwasher instead of washing by hand, that’s fine. This is not a forum for us to judge each other, it is a forum for developing design strategies.

These numbers are first iteration estimates, which err on the high side. This serves several purposes: first, it prevents us from overly restricting the design too early in the process (remember, we are still in the first iteration of the design cycle); second, as appliances age they become less efficient.

Tune in tomorrow for Part 2 where we refine the estimate to more reasonable numbers.


At 12:43 AM, Anonymous Anonymous said...

Keep up the good work, I have you in my favorites list.

At 5:19 AM, Blogger PeakEngineer said...

Appreciate it, anon. Thanks for the support.

At 10:02 AM, Blogger Green2Go said...

Wow look at the number for Hot Water Heater! Glad we opted for Solar.

At 5:07 PM, Blogger PeakEngineer said...

Yeah, I was shocked at the numbers for hot water and ovens. I knew they were high, but the numbers surprised me.

At 8:43 AM, Blogger DJEB said...

Nice resource, thanks!

At 1:31 AM, Blogger bytestyle12 said...

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Acura Integra Air Conditioner Compressor


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