Selecting the correct solar panel products for your home can be an extremely daunting task for the average person. If after reading this buying guide you are still not entirely sure which products you require in order to start using solar panels in your home, then please do not hesitate to contact us now so that our experts can assist you.
South Africa has an average of more than 2,500 hours of sunshine a year; with the total radiation reaching the land area amounting to roughly 1 kilowatt per square metre at noon on a sunny day. This is more than double the solar radiation output of Europe, making it one of the highest in the world and perfect for home solar panels in South Africa.
This buyer's guide will cover the following topics:
* How do Photovoltaic solar panels (PV) systems work?
* Types of home solar panel systems
* Types of solar panels
* Determining what size solar panel system you require
* Solar panel installation
* Benefits of a Photovoltaic solar panels (PV) system
PV Solar panels are made up of a series of cells that convert sunlight directly into electricity (direct current). These cells are made from semiconductor material, usually silicon. Solar panel cells operate according to what is called the photovoltaic effect, ('photon - light, 'Voltaic' - electricity). In the photovoltaic effect, sunlight (or photons) strikes the surface of semi-conductor material, such as silicon, and then the energy penetrates the cell and dislodges electrons from the material's atoms. Certain chemicals added to the material's composition help establish a path for the freed electrons. This creates an electrical current.
A fully functional home solar panel system is made up of the following essential components:
It is important to note that ordinary incandescent bulbs should not be used with a PV solar panel system for the home as they drain power from the batteries much faster than energy efficient LED light bulbs will.
There are two types of Solar Power Systems that can be used in the home or the office, namely:
These systems are designed to operate independently from the grid (Eskom).
Since there is no electrical energy storage (batteries) in direct-coupled systems, the load only operates during sunlight hours when the PV solar panels are hit by the sun; making these designs suitable for common applications such as ventilation fans, water pumps, and small circulation pumps for solar thermal water heating systems.
For the above reason, it is advisable to have solar batteries installed in the solar panel system so that power can be stored and used when there is no direct sunlight.
Grid-connected PV solar panel power systems are designed to operate in conjunction with the grid (Eskom’s power supply). The main component in grid-connected solar panel systems is the inverter. The inverter converts the DC power produced by the PV solar panels into AC power which is consistent with the voltage and power quality requirements of the grid and automatically stops supplying power to the grid when the utility grid is not energized.
A bi-directional solar panel interface is made between the solar power system’s AC output circuits and the electric utility network. This allows the AC power produced by the solar panel system to either supply on-site electrical loads or to feed power back into the grid when the home solar panel system output is greater than the demand of power being used within your house at any time.
At night and during other periods when the electrical requirements in your home are greater than the solar panel system output, the balance of power required in your home is taken in from the electric grid. This safety feature is required in all grid-connected systems and ensures that the solar panel system will not continue to operate and feed back into the utility grid when the grid is down for service or repair.
There are 3 types of Solar Panels available, namely:
These solar panels are made of a large crystal of silicon. Monocrystalline solar panels are the most efficient with regard to absorbing sunlight and converting it into electricity; and thus do better in lower light conditions than other solar panels.
These are the most common solar panels on the market today. They look a lot like shattered glass as consist of multiple amounts of small silicon crystals. Polycrystalline solar panels are slightly less efficient than Monocrystalline solar panels but are less expensive to produce.
These panels consist of a thin film made from molten silicon that is spread directly across large plates of stainless steel or similar material. Amorphous solar panels are less efficient than the other two types of solar panels but are also the cheapest to produce. One advantage of amorphous solar panels over the other two is that they are shadow protected, meaning that the solar panel continues to charge while part of its cells are in a shadow. These work great on boats and other types of transportation.
If you plan on tying your solar panels into the grid, then one way going about it is to just buy as many solar panels as you can afford right now and then simply sequentially adding panels to the system as you are able to afford them over time. Eventually you could end up with a fully operational solar panel system that is completely independent of the grid and providing you with free electricity.
If you wish to completely disconnect your home from the grid, then there are a few steps that you will need to follow in order to find out about how many solar panels you will require to generate 100% of the energy used in your home:
NB. If you are not technically inclined, then it would not be advisable to attempt installing a solar panel system in your home without any assistance from a professional. Sustainable.co.za has many approved partner installation companies who will be able to economically and safely install a solar panel system in your home for you.
There are three ways in which to install solar panels in your home, namely:
Ground mounted solar panels are fixed to poles that are cemented into the ground. There are a couple different options you can choose from if you decide to go with a ground mounted solar panel system, namely:
The most cost efficient ground mounted solar panel system is to just use a setup that points the solar panels towards the most effective direction for maximum sunlight exposure.
Solar Trackers have an optical sensor that follows the sun throughout the day and maximizes the energy absorbed by the solar panels.
This is a slightly cheaper option than active solar trackers. A passive solar tracker system uses the sun's heat to move liquid from side to side within the tracker; allowing gravity to turn the solar panels to follow the sun without the use of motors, gears or controls. By using either type of solar tracker you'll help your solar panels get as much sun as possible throughout the day as it automatically points them in a perpendicular direction to the sun.
Solar panels can be mounted on many different types of roofs. Shingle roofs are the easiest to work whilst tiled roofs can be a bit more challenging.
Although thin film solar panels don't absorb the sunlight with as much efficiency as other solar panels, there are numerous benefits to installing these types of solar panels:
Yes, it can seem daunting having to select the correct solar panels and accompanying products to purchase for your home, however this guide should point you in the right direction. If you require any further assistance, please DO NOT HESITATE to contact us so that our experts can help you choose the correct solar panel system for your home.