Solar Power For Home

Archive for the ‘best solar panels’ Category

Question by treysongz: What is the probability that none of the houses have solar panels to generate electricty?
Using a survey conducted in Winter 2009, it was estimated that only 1% of New Zealanders have solar panels on their houses to generate electricity. Consider a random sample of 20 New Zealand households.

a) What is the probability that at least one of them has solar panels to generate electricity?
b) What is the probability that none of them have solar panels to generate electricity?

Best answer:

Answer by Skeptic
Binomial Sampling Distribution:

P(n) = C(N,n) * p^n * (1-p)^(N-n)

where N = 20 and n = 0:

P(0) = C(20,0) * (1/100)^0 * (99/100)^(20-0) =

1 * 1 * 99^20 / 100^20 =

note: divided numerator and denominator by a common multiple of 10/
8179069375972306130 / 10000000000000000 =

P(0)= 0.8179

a) At least one has solar panels: P(n>0) = 1.0 – P(0) = 1.0 – 0.8179 = 0.1821

b) None of the 20 have solar panels: P(n=0) = P(0) = 0.8179

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Question by Rogon: How Many batteries and solar panels would it take to power an RV?
I want to Make my RV green, But i also want it to be able to power a laptop an xbox360 and an HDTV all at the same time (not while driving). So i really need some high powered solar panels and batteries, also what can i do to cut down on energy cost.

Best answer:

Answer by campbelp2002
Since you usually drive the RV during the day and park at night, you cant use solar power while parked. And covering the entire roof of the motor home would only make about 1 HP worth of solar energy (1 HP = 746 watts). You are better off just charging the batteries with the engine while you drive. But what self respecting tree hugger would be caught dead driving a gas guzzling RV anyway?

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Question by One Person: What was the name of the building that was made out of solar panels?
I really need it for a project. The architecture of it is well known, and the name was in French.
The building was entirely made out of solar panels and has a hyperbola curve to it.
If someone touches it, that person could die from excessive heat.

Anyone have a clue?

Best answer:

Answer by David D
Here are some possibilities…

http://ecoble.com/2008/01/07/the-worlds-coolest-solar-collecting-building/

http://www.4us2be.com/technology/world%E2%80%99s-largest-solar-office-building/

http://www.greatbigcanvas.com/painting-picture-photo/facade-building-forum-building-40359

http://www.cbsnews.com/8301-503543_162-20038202-503543.html

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Question by : Is it worth installing solar panels on a house that has no South-facing roof?
My house is aligned exactly North-South, so I have no roof facing South. Is it worth installing solar panels? Are there any good options for dealing with this situation?

Best answer:

Answer by campbelp2002
In your case you will need twice as many panels. This is because the panels on the west side of the roof will be in shade in the morning and the panels on the east side of the roof will be in shade in the afternoon, and a solar panel in the shade makes no power, or at least very little power. So right there you doubled the cost of an already too expensive system. Or you could build special stands to hold the panels facing south. It would be cheaper to just move to a house with better alignment!

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Question by pookermit: How much does it cost to install solar panels in your home?
Installation plus the solar panels, roughly?

Best answer:

Answer by Paul in San Diego
Basically, you’re looking at about – a watt. So, for a 2 kilowatt system (small house with minimal demand), you’re starting at about K. And, for a 3.5 kW system (most common size), you’re starting at about K. An especially large house might require a system as big as about 5 kW (about K).

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Question by Ed Smurf: What is more important to control Global warming Solar Panels or trees?
If everyone put solar panels on their roofs they would have to remove all the trees near their homes that would shade those panels for the panels to work at maximum efficiency.
bruce and how would enforce such a law? China has a one child law enforced by mandatory abortion.
Jack Higher taxes on who? Everybody?

Best answer:

Answer by umar s
live green
work for afforestation

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Question by Jonathan Lim: How do you begin installing solar panels?
Hi Experts, i reside in singapore and the cost of electricity is always on the hike, i wanna try to install solar panels but am not sure how to begin. Would any kind soul help me out? voltage amphere watt argh its confusing!

Best answer:

Answer by Alvin Ray
1. Make sure you have enough mounts.
2. Get help with the electrical components.
3.Check and double check the position of the solar panels.
4. Use the buddy system for precautions.
5.Do some research about how to safely install solar panels yourself and make sure that you feel comfortable working with the panels before you start.

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Question by louisphily: what are some methods for capturing low voltage electricity from solar panels?
Most solar panels (the flat ones that go onto roofs of houses) reject electricity produced by the panels if they are too low in voltage. For example, on a cloudy day, although the panels may still get some sunlight to produce some electricity, it is rejected because its too low in voltage. So, does anyone have any ideas?

Best answer:

Answer by lee26loo
Put one more panel in series with other one to increase the voltage output during cloudy day.

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Question by Fiz 102: How many kilowatt hours of electricity will the solar panels generate in 30 days?
A house with a south-facing roof has photovoltaic panels on the roof. The photovoltaic panels have an efficiency of 10.3 % and occupy an area with dimensions 3.60 m by 8.65 m. The average solar radiation incident on the panels is 317 W/m2, averaged over all conditions for a year. How many kilowatt hours of electricity will the solar panels generate in 30 days?

Best answer:

Answer by billrussell42
1. Calculate the area, which is 31.14 m²

2. multiply by power density to get incoming power, 31.14 m² x 317 W/m² = 9870 watts

3. multiply by efficiency to get 1017 watts

4. 30 days x 24 hours/day = 720 hours
1017 watts x 720 hours = 732000 watt-hours = 732 kW-hours

.

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Question by blake_yusaki: What unit of time do solar panels account for?
If I’m wanting to produce 800 kwh of electricity a month with solar panels, how many 230 W solar panels would I need? Thanks for any help.

Best answer:

Answer by roderick_young
That depends on how much sun the panels will get. A good start is to go here http://rredc.nrel.gov/solar/old_data/nsrdb/redbook/atlas/ , and enter average, annual, flat plate tilted south at latitude. A map of the US will come up. Find your location, and get the peak equivalent sun-hours per day. This figure averages in the seasons, as well as climate such as clouds.

For example, suppose you get 5 sun-hours per day. If there are 30 days in a month, that’s 150 hours per month. 800 kWh / 150 h = 5.3 kW . That’s about 24 of those panels. But do that math for your location. You’ll need less panels in Phoenix, more in Seattle.

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