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Sir Sparks
Sir Sparks, President/Owner/ Master Electrician
Category: Electrical
Satisfied Customers: 2532
Experience:  US State Certified & UK Electrical Contractor for all electrical fields/disciplines
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Approx how much energy in kW-hr/yr would a 4000 sq.ft house

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Approx how much energy in kW-hr/yr would a 4000 sq.ft house and a 2400 sq ft barn require to heat and operate in eastern massachusetts. Use some assumptions such as 10 ft ceilings in the house and 14 ft in the barn or what ever assumptions would be typical for a high end house. The barn would be maintained at 65
Submitted: 3 years ago.
Category: Electrical
Expert:  Sir Sparks replied 3 years ago.

Sir Sparks :

A Master Electrician here to help. I am a double qualified; USA & UK electrician. Please give me a moment to formulate a reply.

Sir Sparks :

Perhaps the biggest unknown here is the degree of insulation. Also is this just conventional electric heat ?.

Customer :

Assume typical insulation and conventional electric heat.

Customer :

The barn would have some activity in the winter such as a garage.

Customer :

Where to hot air would escape.

Sir Sparks :

huh ?

Expert:  Sir Sparks replied 3 years ago.
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Expert:  Sir Sparks replied 3 years ago.
With the amount of information supplied any estimate I gave would be little more than a wild guess. I will see if another expert can assist.
Customer: replied 3 years ago.

OK, I will try to approach this a little differently. Just let me know if you cant answer this. I use 2200 gal of propane for heat, hot water and range top. I also use 11,000 kW-hr per year for lights etc. I would like to build a 30ft x 80ft gable end barn and heat it. I would like to size a solar PV array to eliminate all my anticipated energy needs. How many kW-hrs should this solar array produce? Give me a range. Your answer will not significantly affect my decision because I am oversizing the array. I would just like to bounce this off of an expert. Will you answer this? huh?

Expert:  Sir Sparks replied 3 years ago.
I can get closer with this. IN MA you are likely to get an annual average of 400 watts per day from an 8 sq. ft $1000 Solar cell.
VERY roughly your Winter heating requirement with conventional electric heat for this 6,400 sq ft total will be 100 to 200 Kw per day So you will need 250 to 500 solar cells at a cost of $250,000 to $500,000 without any allowance for electronics or installation.

The roof space required will be about 2,000 to 4,000 square feet.
Expert:  Sir Sparks replied 3 years ago.
Sorry for the bad news.


When I have answered your question to your satisfaction please click on the "accept" button. This is the only way I get credited for my time and expertise from the deposit you have already made.

After you ACCEPT, you will find in your email inbox a link back to this question,and at a later date you may return here for no additional charge should you require more information on this present question.

As a show of good faith on both sides I recommend this is the way to proceed now.
Customer: replied 3 years ago.

Thanks. The news is not so bad. I am building a 60kW system and I want to backup my claim that it is for personal use and not commercial. Using your high end estimate of 200 kW per day or (200 kW-hrs per day)(365 days) = 73,000 kW-hrs per year. This is approx what the 60kW array will produce in a year. The ROI is a different matter.

 

PS, I am using your 200kW per day as an annual average and not a winter avg. Is the 200kW a winter avg or anual avg?

 

Thanks

Expert:  Sir Sparks replied 3 years ago.
Bearing in mind that this is a rough estimate I meant an average when heating was required. I would expect Summer usage to be considerably less.However when considering all other non heating loads as well, I think your figure is fair as an annual average.

Edited by Sir Sparks on 1/30/2011 at 5:12 AM EST
Expert:  Sir Sparks replied 3 years ago.
Further research shows;
One gallon of propane (LPG) is equal to 27 Kw of electrical energy.
Therefore you annual usage of 2,200 gallons of propane for your present residence equates to 59,400 Kwhr per year. Add to this your 11,000 Kwhr "other loads" makes 69,400 Kwhr per year. So we are definitely in the right ball park here.

Also consider that although you will add 2,400 sq ft to this home size, your propane heating system is also not 100% efficient as is electrical heat.

Edited by Sir Sparks on 1/30/2011 at 6:06 AM EST
Expert:  Sir Sparks replied 3 years ago.
To be honest I am amazed at how close these two independent calculations correlated.
Sir Sparks, President/Owner/ Master Electrician
Category: Electrical
Satisfied Customers: 2532
Experience: US State Certified & UK Electrical Contractor for all electrical fields/disciplines
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