Many manufacturers now offer solar powered attic fans to ventilate and help keep attics cooler. If there is inadequate ventilation in the attic and poor sealing between the attic and the other rooms in the house, attic fans powered by electric means can potentially draw air from the house into the attic. Not only does this compromise energy efficiency but it can also increase the risk of moisture problems in the attic.

Solar powered fans rely on a small solar panel (typically 10 or 20 watt) to power a DC motor when the sun is shining. The fans are installed with intake vents to provide high-capacity powered ventilation without electric operating costs. Most vents are mounted high on the roof near the ridge and are combined with soffit or gable vents for balanced intake and exhaust air streams. Ventilation is only provided when there is ample sunshine to power the fan motor. The highest fan speed will tend to coincide with the greatest heat from the sun and consequently the greatest need for attic ventilation. By reducing attic temperature, attic fans can help reduce summertime cooling loads while at the same time providing ventilation without the added utility load.

Using solar energy to power air vents in your attic means you eliminate the need for electrical wiring in this part of the house and as a solar ventilator uses no electricity you are also avoiding any ongoing operating costs. You will find that the equipment costs for a solar powered attic fan are higher than those of a conventionally powered fan (around $200 more) but this will usually be offset by the money you save in not having to extend electrical wiring into the attic. In addition to attics you will also find solar powered fans used in greenhouses, outhouses, garages, sheds, out-buildings, and paint rooms.

Retail prices for solar powered attic fans range from about $350 to $600 depending on ventilation capacity, the manufacturer, and optional features such as a thermostat.

In instances of new construction, roofers will usually install powered ventilating units. If these units are solar powered roof vents there will be no need for an electrician to rough and finish wire the units. For retrofit projects, a roofer or do-it-yourselfer will be able to install a solar-powered attic fan using conventional tools and techniques.

Whilst not applicable in every instance where cooling is required, solar powered attic fans are an example of smart thinking utilizing a natural energy source.

Greenhouses operate with the same principle having glass or clear plastic all around it attracting and capturing the sun and not allow it to escape causing the greenhouse to stay very warm for the plants to grow effectively.

A home solar power system can cost you around $3,500.00 and more depending on many things, like the size of your home, the amount of appliances used, the size of your family, the amount of electronic components used and much more. There are some very good step by step guides with videos out there to help you build your own solar power system even if you know nothing about solar power. I have come across one package on the internet that claims that you can build your own home solar power system for about $200.00, now that is amazing and hard to believe. Think of all the money you will be saving and all the nice things you will be able to afford for your home with those savings and much more. You shouldn’t ask yourself how much does solar power cost but rather ask yourself how much money will I save ?

In time, solar energy helps to heat your home naturally without worrying about the high electrical bill at the end of the month. and without depending on a company to supply it for you. Solar energy is found wherever the sun is shinning.

It is very possible to build a solar power system yourself by doing a little bit of research on the topic. If you have access to the internet like most of the planet do, then you will find some free and paid information about solar power Canada systems. Of course if you pay for the information, you will no doubt get a much better package put together, guides and videos for about $50.00. It is well worth the investment in order to build your own home solar power system for under $200.00 that will enable you to save thousands of dollars on your energy bill. After all, the sun is free.

Canadian houses like any other houses around the world are built to use solar power with just a few minor alterations to make. Make sure that your house is not blocked by huge trees, and also make sure you have plenty of windows facing the sun when it rises to the south side of your house. Solar Power Canada systems like in many countries don’t rely on the sun shinning all the time but rather, they are built to store a great amount of power from the sun in batteries. You can rest assured that even in the cold Canadian winters when you don’t see the sun for days, it is still possible to have sufficient solar power reserve until the sun makes its appearance again. You also have to lean how to conserve that energy by maybe converting to more power efficient appliances, electronic devices and light bulbs. You can also install ceiling fans to disperse the hot or cold air in appropriate seasons; metal insulated doors are also a good choice for keeping the cold out during those Canadian winter months. Solar power Canada systems are built for the primary reason of saving the planet and the environment. The second and obvious reason is of course saving money, a great amount so you can enjoy life a little more with the savings you will benefit from by installing or building your own home solar power system.

The main difference between concentrated solar power (CSP) energy systems and other solar power systems (such as photovoltaics and solar heating), is that concentrated solar power uses mirrors and reflectors in order to focus concentrated sunlight on a specific location.

How Concentrated Solar Power Systems Work
A simple but accurate comparison to Concentrated Solar Power is the use of a magnifying lens to focus sunlight on a specific area. But the target of a CSP system is to heat fluids, not ants or other luckless insects.

The fluids heated by this concentrated solar energy are then turned into steam. The steam is in turn forced through a fan, and is used to drive a regular steam turbine, which uses its turning motion to generate electricity through electromagnetic means.

One advantage of concentrated solar power is that it is completely compatible with the contemporary power generators which are used in conventional power plants. But in the case of CSP solar energy, the “fuel” used to generate steam is sunlight, not fossil fuels such as oil and coal.

You may be surprised to learn that in the USA, several CSP power plants are already up and running – and that they have performed reliably for the past fifteen years.

At the time of this writing, the least expensive method of using solar power to produce electricity is the to use concentrated solar power systems.

Research and development projects are underway, with the aim of reducing costs even further, so that the cost of producing electricity with solar power can eventually compete with the costs of energy production in modern conventional power plants.

Concentrated Solar Power is one of several methods of generating solar power and alternative energy on a broad scale. Another example of broad scale solar power production is the use of solar power towers. These towers use an assortment of moving mirrors (called heliostats) to continuously reflect sunlight toward a central area at the top of the tower. These heliostats are set up so that they follow the movement of the sun, thus maintaining the strongest reflecting power possible.

So, how can solar power be used on a smaller scale at home as clean source of energy?

Basically, there are four main ways how to solar power your home:

Passive Solar Design:

To think that Americans consume up to 50% of their energy to heat, ventilate and air-condition their homes, a large amount of money and energy could be saved by using passive solar design at home.

Passive solar design is the strategic use of the sun’s energy to heat, light and ventilate your home naturally. For example, having a home that faces the sun, that has large, low-emissivity windows, and that is built from heat-retaining materials will tend to be naturally warmer in winter.

And like the Romans used the sun to light up their temples, careful placing of windows and mirrors in our homes can increase natural lighting, helping us reduce the need for electric lighting.

A natural air conditioning solution would be to plant deciduous trees on the sun-facing side of your home. This would provide cool shade in summer, but allow warm sunlight though in winter.

A solar chimney can be installed for ventilation, where the air in the chimney is heated by the sun and rises, causing fresh, cool air to rush in through the home and up the chimney.

Solar Cooking:

Solar cooking is the cleanest and cheapest way to prepare food. Although it is widely used in third world African countries, where fuel and electricity is not readily available, there is no reason we cannot use it during summer at home.

A solar cooker is made from a series of reflective panels in a parabolic shape that focus the sunlight on a box or pot, in which the food is cooked. It usually caters for up to five people, and can make a variety of boiled, roasted and baked dishes.

The one drawback of solar cooking is that it tends to take three to four times longer to cook food in. But if you weigh that against the unlimited power savings and its portability, having a little patience is not that bigger deal.

Solar Water Heating:

Solar water heating has a number of uses, and thanks to technological developments, modern solar water heating systems can be used at home to completely replace conventional boilers or geysers.

As cold water is pumped through a solar collector, the pipes absorb the sun’s energy, and heat the water, which is then stored in an insulated tank for later use. Usually the water can get so hot that it has to be mixed with cold water before it can be used.

Solar Electric Power:

Also known as photovoltaic power, many homes are starting to make their own power at home with solar electric panels. These panels are made up of small silicon cells and need to be directly aimed at the sun to be most effective.

As the sun’s rays penetrate the solar panels, electrons in the cells become charged, creating a current that is stored in deep-cycle batteries. When electricity is needed, the stored power is passed through an inverter to change the DC to AC, which can then be used to power various household appliances or connected to the grid for net metering.

Other than providing you cheap, clean renewable power, solar electric panels have become affordable and simple enough for anyone to install at home. In fact, with the right information it is possible to make your own solar power for under $200, as compared to getting a professional installation for a couple of thousand dollars.

With these four ways on how to solar power your home, there is no need for you to rely on the utility companies or the government for heating and lighting at home. Right now it is very possible for us to use solar power at home. It is just a matter of everyone having the determination, energy consciousness and environmental awareness to take action and harness the sun’s free, natural power.

1. the actual pump and
2. an energy source being powered by the sun, with a cable or wire connecting the two devices.

Solar powered pumps can be used to pump water for humans, livestock or plants. Since the need for water is greatest on sunny hot days the technology is an obvious choice for this application.

Pumping water using solar powered technology is simple, reliable, and requires almost no maintenance.

To date the greatest use for solar powered pumps has been in agriculture where the pumps can be used on remote farms and outback stations to supply water to livestock. The remoteness is the key thing here as powering the pump by any means other than solar would be costly and inefficient. In a like manner, solar powered pumps are used extensively in developing countries to pump water from wells and rivers to villages for domestic consumption and irrigation of crops.

A typical solar powered pumping system consists of an array of Photo Voltaic (PV) cells that powers an electric motor, which drives a pump. The water is often pumped from beneath the ground or from a stream into a storage tank that provides a gravity feed. No energy storage is needed for these systems (save from maybe a rechargeable back-up battery source). Solar powered pumping systems are a cost-effective alternative to windmills (particularly on still days) for remote area water supply.

The most inexpensive solar powered pumps cost less than $1,500 while the larger systems can run to over $20,000. Most PV water pumps rarely exceed 2 horsepower in size. A well installed quality PV water pumping systems can provide over 20 years of reliable and continuous service.

Whilst it has been the needs of developing countries and agriculture that has initially driven the demand for solar powered pump technology, a greater environmental consciousness around the world has seen many householders use solar powered pumps (rather than a less environmentally friendly internal combustion engine) to create solar powered waterfalls or solar powered fountains in a pond display.

A solar powered pond, powered directly from solar panels, will work whenever there is direct sunlight; the brighter the sun the stronger the flow. Some solar powered water fountains will include a remote solar panel with enough wire that allows for the solar panel to be placed well away from the fountain. Solar power offers a great alternative when convenient electrical installation is not possible – as is often the case with gardens.

Decorative additions to a solar powered pond display such as solar powered glowing frog lights and solar powered floating lily pad led lights can usually be purchased at the same place that you purchase your solar powered pump kit.

Solar photovoltaic energy converting sun light into electrical energy. The most commonly associated component are the photovoltaic panels or solar panels that you see mounted on roofs.

This article will be focusing on how photovoltaic solar power (solar panels) and systems work.

Why are solar photovoltaic panels always on the south (or north) side of the roof?
In order to get the maximum electrical output from photovoltaic panels they need to be oriented to solar south in the northern hemisphere and solar north in the southern hemisphere. Solar north and solar south are the same as magnetic or compass north or south. There is about a fifteen degree difference between them.

Most solar photovoltaic panels are set at home latitude plus fifteen degrees or home latitude minus fifteen degrees. Depending on if you want a summer or winter bias to the angle of the solar panels. In higher latitudinal areas it makes more sense to have the photovoltaic panels set on a winter bias, so that during the winter the solar panels still get enough sun light to produce electricity.

How does a photovoltaic cell produce electricity?
A solar panel consists of a collection of photovoltaic cells. Each photovoltaic cell is made up of silicon wafer. Silicon in its pure state is a poor electrical conductor. During the manufacturing process, an impurity is added to the silicon so that when the photons (light) strikes the wafer electrons are released and create electrical current.

The type of electrical current produced by a solar panel is a low voltage direct current, or DC, typically in the range of six to twenty four volts. Photovoltaic panels have a nominal output voltage of 12 volts and an effective operating voltage of 17 or more volts.

A solar panel’s electrical output is affected by several factors. They are angle of the photovoltaic panels to the sun, time of day, time of the year and weather conditions. Solar photovoltaic panels produce more electricity during the middle of the day when the sun is directly overhead compared to the early morning and late evening when the sun light is striking the solar panel at a shallow angle.

Components of a residential solar power system
A residential solar power system consists of four components are: photovoltaic panels, charging controller, battery pack and an inverter. The photovoltaic panels convert sun light into electricity. The electricity is sent to the charging controller who keeps the battery pack fully charged, but not over charged. The battery pack sends the electricity to the inverter who converts the DC voltage to household AC at 120 volts and 60 hertz.

Photovoltaic panel
The output of a solar panel is stated in watts. The wattage is stated is typically for peak sun hours. Since the amount of sun light varies through the course of a day, to level out the variations the peak sun hours has been adopted by most manufactures to help installers and customer’s compare different solar panel models.

Suppose a solar panel is rated for 100 watts and an average of six peak sun hours is available per day. Then the solar panel would produce 100 watts * 6 peak hours = 600 watt hours of electricity or 0.6 kilo watt hours (KWh).

Charging controller
Charging controller or charge regulator controls the charging of the battery pack. It continually monitors the battery pack’s charge state. If the batteries are low, it will send electricity from the solar panels to the batteries. It also prevents over charging of the battery pack.

Don’t allow someone to convince you that a charging controller is not really required. Directly connecting the photovoltaic panels to the battery pack can permanently damage the batteries and possibly cause them to explode.

Battery pack
The battery pack’s purpose is to store electricity generated by the solar panels during the day and then at night or during extremely cloudy days provide electricity to the inverter.

The battery pack typically consists of lead acid batteries. Lead acid batteries are relatively inexpensive and readily available. There are many different types, sizes and capacities of batteries available. The most popular are gel cell and AGM deep cycle batteries because they are maintenance free and last a lot longer than wet cell lead acid batteries.

The most important thing to remember about the batteries is that the need to be deep cycle. Deep cycle batteries are designed to be discharged then recharged hundreds if not thousands of times. A deep cycle battery is designed to discharged to nearly empty, but not completely and then be slowly recharged over time. A common mistake for home owners is to think that they can use automotive batteries instead of deep cycle batteries. Car batteries are shallow cycle batteries. They are designed to discharge a lot of current quickly and then be immediately recharged.

Inverter
An inverter converts the DC electricity stored in the battery pack into household 120V AC. Almost everything in your home is powered by 120V electricity. Things like table lamps, freezer, lights, motors, dishwasher, and so on.

There are two main types of inverters sine wave and modified sine wave. The power company provides electricity as a sine wave. The electricity’s charge value goes smoothly from positive 120V to 0V to negative 120V and then back up to 0V and finally up to positive 120V. Then the cycle begins all over again. The time it takes to go through the entire cycle is one second.

Modified sine wave is also known as a square wave. Here the electricity’s charge value goes from positive 120V to negative -120 volts in effectively zero seconds.

Most household devices will function on a modified sine wave power. Light bulbs and motors will work, just not quite as efficiently as they would on sine wave electricity. However, there are some electronic devices that will not work on square wave electricity. It will be necessary to check with the manufacture to determine if the device will work on square wave electricity.

Now you have a basic understanding of solar power how it works to power your home. Now you have enough information about how solar power works to determine if it is a technology that you would want to invest in for your house.

Six Easy Steps To Estimate Cost of a Solar Power System
Solar power energy systems are not inexpensive. That said it’s important to compare them within context of other types of home improvement projects. Home buyers and realtors view a solar photovoltaic or solar hot water heating system as a significant value-added improvement – similar to adding a deck or remodeling your kitchen. Plus unlike a deck or kitchen remodel, you also gain one-up on your power bills.

Solar power systems often get an additional financial boost as well: many jurisdictions and utilities across the USA offer attractive financial incentives to drive down the upfront capital costs associated with a solar power system.

Here are some foolproof ways to estimate the cost of a solar photovoltaic or solar thermal system and to figure out if a solar energy system makes sense for you. Let’s start with a home photovoltaic (PV) system.

Step 1: Estimate your home’s electricity needs
To get started, it’s good to have a sense of how much electricity you use. You’ll have a better point for comparison if you find out how many kilowatt hours (kWh) you use per day, per month, per year. Your utility bill should include that information.

Of course, the utility bill will also display your costs and many utilities include a graph that displays how your monthly energy use/cost varies throughout the year. That helps you estimate where your highest energy use is and at what time of year.

New Home Construction
If you are constructing a new home, then you’ll need to estimate your demand based on the type of equipment you plan to install and your home’s square footage. The pross call this “your load”.

To figure out your anticipated load, create a table to record the watt use for each appliance. Each appliance – be it a water heater, electric light, computer, or refrigerator – should have a nameplate that lists its power rating in watts. Or you can get the information from the manufacturer’s website.

Some labels list amperage and voltage only; to obtain watts multiply the two together (amperage x voltage = watts). In another column, record the number of hours each appliance is expected to operate. Then multiple the watts and hours together to estimate watt-hours used per day. Since it’s hard to anticipate all electric loads (it may get tedious scouting out every toothbrush and mobile phone cell charger), you might want to add a multiplier of 1.5 to be safe.

Step 2: Anticipate the future
In 2005, average residential electricity rates across the USA ranged from about 6 to nearly 16 cents per kilowatt hour depending on where you lived. Average retail and commercial electricity rates have increased roughly 30% since 1999 and the upward trend will likely continue especially as costs for the coal and hydropower used to generate that electricity rise as well. So think about your home electricity needs and present and future cost in relation to one another.

Step 3: How much sun do you get?
The Florida Solar Energy Center has conducted a study to examine how a 2-kW photovoltaic system would perform if installed on a highly energy efficient home across the continental USA (http://www.fsec.ucf.edu/en/publications/html/FSEC-PF-380-04/).

The study accounted for all factors that impact a PV system’s performance such as the temperature effect on the photovoltaic cells, the amount of sun peak hours in various regions, and the efficiency of inverter to convert solar derived energy from DC to AC.

As the study implies, solar photovoltaic systems work just about anywhere in the US. Even in the Northeast or in “rainy Seattle”, a pv system can pencil out if designed and installed properly. In New York or New Jersey, a one kilowatt system should produce about 1270 kilowatt hours of electricity per year, in Seattle, a one kilowatt system should produce about 1200 kilowatt hours per year. In the Southwest, of course, those ratios will be much greater.

Solar contractors in your area can help determine the best size for your solar photovoltaic system.

Step 4: Size your system
In general, solar photovoltaic systems sized between 1 to 5 kilowatts are usually sufficient to meet the electricity needs of most homes. One advantage of grid-tied systems is that you can use solar PV to supplement or offset some of your electricity needs; therefore you can size your system to match your budget and always add to the system later if needed.

Also as a side note, here’s a rule of thumb to remember to help you estimate the physical space your PV system might need: one square foot yields 10 watts. So in bright sunlight, a square foot of a conventional photovoltaic panel will produce 10 watts of power. A 1000 watt system, for example, may need 100 – 200 square feet of area, depending on the type of PV module used.

Step 5: Know your rebates
Many states and local jurisdictions offer rebates, tax credits and other types of incentives to homeowners for installing residential photovoltaic and solar domestic water systems. To view a comprehensive database of the incentives available for renewable energy visit http://www.dsireusa.org.

At the Federal Level, you can take advantage of a 30% tax credit (of up to $2,000) for the purchase of a residential solar system at least until December 31, 2008.

Solar power for the home owner has become more practical over the years; It will make the value of your home appreciate, support the cause for a better, cleaner environment. Because solar power for homes is becoming more main stream the accessibility to solar power is also increasing. There are many ways to start your home off to becoming a solar powered house but first it’s important to understand what solar power is and how solar power will work for your home.

Solar power has two main types: solar photovoltaic and solar thermal. Solar photovoltaic is the converting of sun light into electrical energy and solar thermal uses the sun lights infrared energy to heat liquids that will later release its own stored heat. Solar panels are the most used type of solar power for homes. This method is utilized when you see those black panels mounted on the roof of a solar powered home.

One the biggest benefits of solar power for homes is that your home will now be free of the use of fuel which will drastically cut your monthly utilities bills. The fact is, Solar power is a never ending source and you will not have to worry about depleting the the sun. It is an unlimited source of solar power for your home. Not to mention that solar panels offer no moving parts so there is little to no maintenance required with solar power for homes. There is also the added benefit that most manufactures of solar panels include warranties with their products. Manufactures may have a warranty that is good for up to 25 years.

Solar power for homes can be done simply and effortlessly and provide you and your family many years free from electricity bills and unwanted gas bills. With your unlimited supply of solar power you can choose to start off small and just convert your heating to solar power or you can decide to power your entire home with the unlimited supply of solar power.