Tag: Solar panels

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Roofing

Keep your solar panels clean

Benefits of solar panel cleaning

There are several benefits of cleaning your solar panels. The most important benefit is ensuring they can generate the maximum amount of power possible. Plus, regular solar panel cleaning and solar panel maintenance can expand the functional lifespan of the solar panels. Clean solar panels absorb more sunshine than dirty ones and function more efficiently. Therefore, you’re able to save more on energy bills, helps maintain the manufacturer’s warranty and enables you to get more out of your investment. That’s true even if you do the solar panel cleaning services yourself.

How often to clean solar panels?

Research shows solar panels provide optimal performance when cleaned twice a year. Many experts recommend solar panels be cleaned in spring and Autumn. How dirty solar panels get due to environmental factors determines how often you should clean them. If you live near the sea, near lots of construction dust, automobile exhaust, leaves, bats or birds, you should regularly check the solar panels to see if they need cleaning. However, be aware excessive cleaning can scratch solar panels and reduce their efficiency.

Solar panels before & after cleaning / Source: Kleen Genie

Materials and tools

Very little solar panel cleaning equipment, supplies and tools are required to clean dirty solar panels. They are:

  • A good quality soft brush: This will be used to safely and carefully remove dust, debris or anything else a water hose cannot wash off the panels. 
  • Squeegee:  One side of the squeegee should have a plastic blade, and the other side should have a cloth-covered sponge.
  • Hose: The combination of water, a soft brush, a mild detergent and the squeegee should be enough to get the panels clean. 
  • Very mild detergent: This is an optional item some people use to help remove dirt and grime that cannot be removed with water and a soft brush alone. 
  • Distilled or de-mineralised water: Some people use distilled or de-mineralised water to clean their solar panels to help prevent streaking. De-mineralised or distilled water can produce a spot-free finish which is more resistant to dirt and grime, provides a better result and has a longer-lasting impact. 

Contact local roof cleaners

The best way to clean solar panels

Finding the best method for cleaning solar panels on the roof is very important. Solar panels are exposed to lots of environmental pollutants and must be kept clean in order for them to provide optimal performance. The following steps outline the best method for cleaning solar panels on the roof safely and properly.

  1. When to clean solar panels: If your solar panels are dirty, it’s best to clean them early in the morning on a day when it is overcast. In cooler months, clean the solar panels in the evening. The key reason for this is cleaning solar panels when they are hot can damage them. Plus, the hot sun can make cleaning products dry on the solar panels too quickly and leave grease and residue on them. 
  2. Shut off the system: When you are going to clean solar panels, you first have to shut off the system. This stops electricity from flowing and makes it safe to make contact with them to do the cleaning. You can also have an accredited professional Clean Energy Council certified technician check the panels for discolouration, cracks, chips or other obvious defects. They can also safely make sure all cables and fittings are securely attached before starting to use your solar panel cleaning equipment.
  3. Brush off any debris: Once the system is safely turned off, use a soft brush on a long pole to brush off as much dirt and debris as you can. In many cases that’s all it takes to get the solar panels clean. A soft brush is the best brush for cleaning solar panels because it will not scratch the glass surface.
  4. Scrub with water and a brush: If after you have gone over the solar panels with a soft brush there is dirt or grime, it’s time to add a little water. Aim the hose at the front surface of each solar panel and scrub it using the water and the soft brush. If some dirt and grime remain, you can add a little of the very mild detergent and scrub with the soft brush and the side of the squeegee with the sponge to clean all the grime off each solar panel. 
  5. Rinse: Once the dirt and grime have been carefully removed, rinse the panels using the water hose and dry them with the squeegee. Make sure you only put the water on the solar panels’ top surface. Don’t spray water on the back of the solar panels or in gaps between the roof and panels. This can damage the system. Ensuring the panels are dry prevents hard water mineral build-up on the glass. Regular solar panel cleaning services is an important part of proper solar panel maintenance. 

How to clean solar panels from the ground

People often ask does cleaning solar panels make a difference, and the answer is yes! However, when you are cleaning your solar panels yourself, the safest way is to stand on the ground and use a hose and a squeegee with a very long handle. Cleaning the solar panels while you are standing on the ground is safe and comfortable. Spray the panels with a water hose. Use a soft long-handled brush to remove loose dust and debris and the sponge to scrub off stubborn grime and residue. Then rinse off the panels and dry them with the squeegee. 

Clean solar panels / Source: JFK Electrical

How to hire a solar panel expert

Hiring a solar panel expert is a simple and straightforward process. You can ask your relatives, friends, neighbours and acquaintances who have solar panels for recommendations. However, you have to make sure they have the proper licencing and qualifications.

Required licensing and qualifications

To be able to install photovoltaic systems in Australia legally, a person needs two crucial documents. They are an electrical licence as well as Clean Energy Council Of Australia accreditation. They can also work as a solar panel installer if someone with an electrical licence supervises them. Property owners only qualify to get rebates from the government if the solar panel installer is CEC accredited.

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Lighting & electrical

How does solar power work?

The sun provides us with an abundance of energy each day, its powerful rays offering an energy solution that keeps high energy bills at bay and minimises the need for damaging fossil fuels. Solar energy is a renewable and powerful source of power, producing more energy in an hour than what is used across the world in a year. By harnessing the sun’s thermal energy and with the right power system, solar panels can generate enough energy to sustain a household’s electricity usage.

How does solar power work?

Solar power systems are comprised of panels, inverters, switch boards, electricity meters and in some instances, a power grid. When a grid is connected to a solar power system, it draws energy from an inverter to power household appliances and any leftover electricity is fed back into the grid. Stand alone power systems are disconnected from a public grid and rely on a battery to store surplus energy to supply electricity during overcast days or overnight use.

Solar power is a green, sustainable and cost-effect source of energy / Source: M Bec Electrical

Stand alone systems with batteries aren’t as common as grid systems for homes but with improving battery technology and cheaper production, batteries are becoming more popular. The appropriate size and capacity of a battery will depend on the amount of power your household spends during the night.

The number of panels you require to power your home will depend on the number of people residing and the frequency of use. Usually, a medium sized home for 2-3 people will require a 3kw system whereas a large home for four or more people will require a 5kw installation to power a fridge, 20 or more halogen lights, multiple air conditioners and approximately five or more loads of washing a week.

What are the difference between an off-grid system & a grid connection?

The difference between the two systems is that an off-grid system is not connected to the community’s main power supply and stores its excess electricity in batteries. A grid-connected solar PV system is connected to the community’s main electricity grid, and the excess electricity is sent into the community grid.

Solar power inverters

A solar power inverter works very much the same way as a travel plug. It converts the electricity from solar panels into electricity that can be used in the home. Electricity used by the solar panels are DC power, and the solar power inverter converts it to AC power, which is usable in your home.

There are many different forms of solar power inverters, and each has advantages. Here are just a few of the many types of inverters available for purchase:

Standalone: convert the DC electricity that is harvested from a battery to AC electricity. Solar panel inverters are used for many home sizes, so they come in a range of different sizes and powers. You can find standalone inverters to run small objects, which put out as little as 100W, and some can run quite large appliances, with an output of 8000W. To determine which size inverter you need, you have to do a quick calculation of the AC load that each of your electric appliances uses currently.

Sychroneous inverters: These inverters harvest energy from your appliances and stores it in a battery. The way this process works is that any excess power you don’t use gets allocated to the main grid. However, if you’re using more than your store, the inverter provides you with the excess electricity you need from the grid. The good thing about this kind of inverter is that it works as a generator in power-outage situations.

Multifunction: Multifunctional inverters are the most expensive ones, but they work as synchronous and standalone converters together, which gives you all the benefits of the above in one single inverter.

Modified sinewave inverters: If your solar power system lacks electric motors, a modified sine wave converter would be an affordable choice for you. The only downside is that they do create a buzzing sound as long as they’re running.

True sinewave inverters: These work very much in the same way as the sinewave inverters. However, they are a little bit more dear since they are compatible with more devices and they’re relatively quiet to run.

Source: Oracle Carpentry/Roofing Sydney

What’s a solar booster?

 Solar panels must be used with a solar inverter to transfer the DC energy to AC energy, and a booster works to rev up this process, especially in times where there isn’t much sunshine.

If you have a television that has very poor reception, you were probably told to purchase a higher powered antenna or a signal booster. The higher powered antenna or booster would give you more coverage, more channels and a clearer picture. The solar booster sort of works in the same way for your solar panels.

Benefits of using a solar booster

Solar panels often give you their best during clear sunny days. However, on days when it is exceptionally cloudy or dark, you may not get the best use out of them. This may cause you to time your hot showers or electricity use. A solar booster helps to increase your solar panel’s uptake of energy by up to 30%. This helps reduce your energy costs even more.

Besides the obvious benefits of being able to use your electricity and gas for longer, a solar booster can be connected to an off peak electricity or gas source to help you save even more money. Living in areas that are prone to cloudiness, long hours of darkness or extreme shade, makes it harder for your solar panels to work for you. Solar boosters can help them work as they normally would in a sunny area. They won’t give too much optimisation in these areas, but it will help the existing panels run more efficiently.

Installing a solar booster

Although solar boosters are available for purchase at many of the places that carry solar panels, installing them may be a bit difficult. It’s best to have a professional instal the solar booster for you. A professional will make sure that you’re getting the most out of your booster.

Contact local solar panel experts

Solar glossary of terms

How solar savvy are you? If you can’t describe a photovoltaic panel and you’re not sure what a grid is, this glossary of solar panel terms is for you. Here is a basic summary of basic solar power definitions:

Alternating Current (AC) is a type of electrical current that intermittently alters directional course, typically at a rate of 60 times every second.

Amorphous Thin Film is a photovoltaic, silicon-based film, mixed with other substances that is used to cover solar panels.

Charge Controller is a device that controls the amount of power that is sent from the solar panel to the battery tank to prevent overcharging.

Direct Current (DC) differs from an alternating current in that it travels in only one direction.

Feed-in Tariffs are rebate fees that your electric company pays to you when your solar power system feeds energy back into the grid. This fee is higher than the retail rate usually charged for electricity.

Grid Connect Solar Power is a solar power system that connects to the utility company’s grid. Any excess electricity generated by your solar power system is fed to the utility company’s grid.

Monocrystalline is a material, containing one crystal, that is used for semiconductors.

A Mounting System mounts and securely holds photovoltaic panels to the roof of your house.

Off-Grid Solar Power is solar-generated power that isn’t connected to the utility company’s grid and is instead stored in special containers and batteries.

Passive Solar Heating is a method of harnessing solar power to heat living spaces. Examples include storing solar heat and installing glass at the northern points of a house to bring in maximum light.

Photovoltaics is the method of converting light into electricity by using light-converting (photovoltaic) panels, modules or cells.

Polycrystalline is a material used for semiconductors that is made of tiny crystals.

Renewable Energy Credit Scheme (RECs) is a plan that offers cash back for regenerated electricity. According to current standards, a Renewable Energy Certificate (REC) stands for a single megawatt hour. These certificates operate through solar power or hot water systems and can help offset the expense of installing them. The quantity of RECs generated by your solar power system depends upon its size.

Shunt Adapter is an adapter that allows you to attach a shunt to a solar regulator, which you can use to precisely record and calculate high-level currents (such as those more than 20 amps).

Solar Inverter is a device that converts a direct current into an alternating current, which is then used in either grid-connected or off-grid systems.

Solar Regulator is another name for a charge controller.

Solar Site Analysis is an analytical tool that provides information about solar shading and helps you identify the best locations for solar power systems.

Solar System Monitoring is the practice of monitoring a solar power system to determine its efficiency. Ammeters and voltmeters are commonly-used analytical tools, and there are also other devices that are designed to measure solar power input and output.

Volt is the unit of force that is necessary to propel an amp of electricity through a resistor measuring 1 Ohm.

Watt is a power unit that is the equivalent of one single joule each second.

Categories
Lighting & electrical

Solar panels: What are they & how do they work?

How do solar panels work?

A solar panel is a photovoltaic panel that absorbs light and heat from the sun and produces electricity from it for use in your home. The panel is usually made of silicone photovoltaic cells that are placed between plastic sheets and glass. There are three common panel options, monocrystaline, polycrystaline, and thin film. The most common is polycrystaline because it is an affordable solution and one that has good overall performance. The monocrystaline models are more efficient, but they cost more to install. The third option, a thin film, is useful for smaller scale projects and needs.

Solar panels generate direct current (DC) electricity. Houses use alternating current (AC) electricity so you’ll require an inverter to convert the DC power from the solar panels to the AC power that your home uses.

Solar panels are a sustainable source of energy / Source: Jenson Electrical

On-grid vs. off-grid systems

An on-grid solar power system is connected to the electric company’s grid. Any extra electricity your solar panels generate that isn’t used by your home is sent to the electric company.

An off-grid power system is not connected to the electric company’s grid. Instead, any excess energy created by your solar panels is stored in backup batteries that can be used to power your home during times that your solar panels are not creating enough energy.

Choosing a solar panel

The main factor to consider when purchasing a solar panel is wattage and size, which will generally be based on the size of your home and the amount of power you need. It is best to work directly with a local solar power professional to determine the specifics of your setup, as they have the experience to fit the right solar panel to your particulars.

Wattage matters

The most important factor to consider when sizing solar panels is the amount of wattage that can be generated. The number of watts the panel can output is often displayed on it. If a panel has a 200 watt capability, that means it will generate 200 watts of electricity per hour. But, keep in mind that is during peak sunlight conditions and at a temperature of at least 25 degrees Celsius.

You will find that models come in a variety of different sizes. Some are very small at around 50 watts. Some are much larger, up to 230 watts. Some may generate even more than this. You will want to realise, though, that these ranges are based on optimal conditions. In most cases, you can expect a drop by about 15 percent in their overall performance since conditions will not be optimal all of the time.

Size matters

Aside from wattage, you also have to consider the actual size of the solar panel itself. The size is a factor because it will need to fit on the structure you have chosen for it. In most cases, the smaller the wattage is, the smaller the physical size of the panel will be, and of course the opposite is true: the larger the wattage, the larger the panel. Look for panels that are capable of producing enough power for your needs, but that also fit well on your roof space. You will need to ensure that the solar power system fits right now, but also think about what your needs may be in the long term. You may be able to expand the solar power system in the future. If you do expand later, you need to consider if you will need to remove all existing panels and start over or just extend what you have presently.

Installing solar panels

Solar panels need to be properly installed to work at their most efficient level. They can be installed on top of your home’s roof, on top of an outbuilding or on top of poles You should try to have them to placed on the south side of the roof so that they get the most sunlight. If possible, ensure they are angled to face towards the sun. If you have a pitched roof, this is easy to do. If you have a flat roof, you may need to install framing to provide for this necessary angle.

Solar panels should be installed where they will receive the maximum amount of sunlight / Source: Hot Water Heroes Pty Ltd

Consult a professional to get a right-sized, properly-designed, and properly-positioned solar panel system for your home. It should be large enough to generate enough electricity to make it worth the cost. Most solar panels systems can be completely installed and running in one day.

Saving money with solar panels

If the solar panels generate too much energy, creating an excess, you can sell that to the power company for extra cash. When you feed the power grid, the power company will pay you one of two ways:

  1. It can pay you a net feed tariff, which pays only for the excess energy generated or,
  2. It can pay a gross fee tariff, which pays for all the electricity the solar panels generate.

Varying from region to region, the solar panel tariffs are guaranteed to be one or the other. This saves homeowners a great deal of money.

Depending on the amount of electricity, your solar panels may reduce your need for traditional electricity to nothing, or very close to it. This could potentially save hundreds of dollars on your utilities bill just by eliminating your dependence on the main grid. As the cost of electricity rises, you can sit comfortably, collecting credits on your utility bill thanks to your solar panels. Those credits can be used for less-productive months, or you can have them paid out in cash.

Contact local solar panel experts

A sustainable choice

One of the greatest benefits of solar panels is their contribution to the environment. Solar panels are much more earth friendly than burning coal, which is where most Australian electricity comes from. If you’re a heavy electricity user, it’s especially important to mitigate the damage of your use, such as releasing greenhouse gases and depleting fossil fuels, by installing solar panels.

The solar panels use the power of the sun to generate electricity, placing almost no burden on the environment. The sun is renewable and readily available. Though manufacturing and disposing of the solar panels does have an impact, they are ultimately far superior to other methods.