## Re: Living Off The Grid

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• Jay wrote: A 2000 sq foot house has 2000 sq feet of roof. A 4000 square foot house has 4000 Sort of; it s only valid in a two-dimensional world, with all
Message 1 of 29 , Feb 11, 2011
Jay wrote:
"A 2000 sq foot house has 2000 sq feet of roof. A 4000 square foot house has 4000"
Sort of; it's only valid in a two-dimensional world, with all roofs flat - perhaps valid at the equator?
Around here, for PV purposes, roofs should be slanted about 30 degrees.  A 40 x 40 ft house (1600 sq ft footprint) would have about 1840 sq ft of roof (without overhangs).  If you built such a
40 x 40 ft house at 90 degrees latitude, your ideal PV roof would be vertical and veeeeery tall.  Yes, it can get ridiculous.
Peace
Ariel

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• Thank you, that is priceless. No offense, sometimes I feel like I live in a two dimensional world. Congratulations to the people of Egypt. Lynden
Message 2 of 29 , Feb 11, 2011
Thank you, that is priceless. No offense, sometimes I feel like I live in a two dimensional world.
Congratulations to the people of Egypt.

Lynden

Jay wrote:
"A 2000 sq foot house has 2000 sq feet of roof. A 4000 square foot house has 4000"
Sort of; it's only valid in a two-dimensional world, with all roofs flat - perhaps valid at the equator?
Around here, for PV purposes, roofs should be slanted about 30 degrees.  A 40 x 40 ft house (1600 sq ft footprint) would have about 1840 sq ft of roof (without overhangs).  If you built such a
40 x 40 ft house at 90 degrees latitude, your ideal PV roof would be vertical and veeeeery tall.  Yes, it can get ridiculous.
Peace
Ariel

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• Well, yeah. I was ignoring that for simplicity, and just talking about it from the top, the way it would appear on the floor plan. But you are, of course,
Message 3 of 29 , Feb 11, 2011
Well, yeah. I was ignoring that for simplicity, and just talking about it from the top, the way it would appear on the floor plan. But you are, of course, absolutely correct.

At 90deg latitude you are on the north pole. The sun is permanently up during summer and permanently down during winter. The angle will be a problem, but properly sizing your battery will be the real nightmare... well, that and getting groceries... hehehe

--- In hreg@yahoogroups.com, Ariel Thomann <ajthomann@...> wrote:
>
> Jay wrote:
>
> "A 2000 sq foot house has 2000 sq feet of roof. A 4000 square foot house has 4000"
> Sort of; it's only valid in a two-dimensional world, with all roofs flat - perhaps valid at the equator?
> Around here, for PV purposes, roofs should be slanted about 30 degrees. A 40 x 40 ft house (1600 sq ft footprint) would have about 1840 sq ft of roof (without overhangs). If you built such a 40 x 40 ft house at 90 degrees latitude, your ideal PV roof would be vertical and veeeeery tall. Yes, it can get ridiculous.
> Peace
> Ariel
>
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>
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