Premium Quality of solar panels [ 7 factors ]
The quality of Solar Photovoltaic ( PV ) Panels depends on a variety of factors which must be kept into consideration
The quality of Solar Photovoltaic ( PV ) Panels depends on a variety of factors which must be kept into consideration before taking the decision of installing solar power plant on your roof or on the ground. These factors determine the time you get return of investment and life and electricity production of solar power plant.
Following are the 7 factors which defines the quality of solar panels used in the installation:
1) Certifications. The panel should have IEC 61215 (crystalline) certificate which guarantees the quality of solar panels in terms of electrical parameters and mechanical stability, IEC 61730 for prevention against electric shock , fire hazard and bodily injury due to mechanical and environmental constraints and IEC 61215 which fixes the electrical performance.
2) Solar panel technology. Usually there are two solar panel technologies widely used now a days namely Polycrystalline, Mono perc. Depending on the needs of a particular consumer the technology can be chosen. Before choosing the technology of solar panels make sure the technology meet the needs, expectations and is well adapted to the electricity production context of your solar panel system.
3) Manufacturers reputation. Reputation and history of the solar panel manufacturer is as important as their perceived quality. The Tier 1 rating of the solar panel manufacturer can be somewhat misleading as it does not guarantee that the panel is free from defects or will perform over the life of the system. So, try to find out the reputation of the solar photovoltaic (PV) module manufacturer over the internet. It is also beneficial to check both the positive and negative reviews of the solar module manufacturer.
4) Efficiency of Solar PV modules. The efficiency of a solar panel is a measure of the amount of sun rays or solar energy which falls on the solar photovoltaic (PV) module and the amount of which is converted into electricity. The efficiency of commercially available solar panels as of now in March, 2020 varies from 16% to 22%. The term efficiency is most of the times mislead by the people with the quality of the solar panels, but a slightly more efficient panel is not always equal to a better quality panel. Quality is related to real world performance, reliability, company history and manufacturer’s warranty conditions.
5) Guarantee of Solar modules. The warranty of solar panels sold around the globe is divided into 2 parts. 1st Standard warranty also known as manufacturer’s warranty and 2nd the performance warranty. The standard warranty / manufacturer’s warranty period for solar panels sold around the world is 10 year and performance warranty is of 25 year.
a) Standard / Product warranty. The product warranty of solar module is just like an insurance cover provided by the solar PV module manufacturer against any manufacturing defects, environmental issues, component or material failure etc. In general solar PV manufacturers must provide the minimum 10 year product warranty but a growing number of premium manufacturers are offering product warranties of 12, 15, 20 and even 25 year. As with most warranties , a longer period is usually more advantageous to you, if you own a solar PV panel system.
b) Performance / Power output warranty. The amount of electricity a solar panel produces declines slightly year on year. That’s true of all solar panels, but to varying degrees. The common industry standard is 80-83% power output retained after 25 years however some high-end manufacturers such as Sunpower, Panasonic, Hyundai and LG guarantee 88-92% power output on most modules after 25 years of use. Performance warranty coverage is yet another indicator of a panel manufacturer’s service and support policies in the event that you ever encounter a problem with your solar system.
6) Price. The price of solar panels is normally expressed in Rs/ Wp or Rupees per Watt Peak. Solar energy cost has gone down in the past decade. The average cost of solar panels now as of 2020 is less than half of what it was ten years ago.
As of the time we updated this page (March 2020), most solar panel prices fall in the range of 21 rupees to 27 rupees per watt peak. Premium panels can climb above 28 rupees per watt depending on their size, quality, and where they are manufactured.
Beware of very low prices solar panels as we all know that quality comes with a price and cheap panels means quality is compromised. So, choose the a reputed company don’t be very much bothered about the price of the solar modules.
Do not hesitate to ask several quotes from several distributors or solar installers to compare about the prices, but keep in mind to always choose the best quality of Solar panels, solar inverters, Solar mounting structures etc. are being used in your solar power plant installation.
6) Power tolerance. Power tolerance is generally defined as how much electrical power output a solar panel could actually produce above or below its rated capacity at any time. For example if a solar panel with rated capacity of 400 Wp has a tolerance of +/- 5% then the solar PV module can actually produce 380W to 420W.
Make sure to use only positive tolerance modules, which means that you are guaranteed to get at least the specified output power of the solar panel.
For example: a 400W solar panel with a tolerance of + 5% / – 0% will produce a minimum of 400W and a maximum of 420W.
7) Temperature coefficient. The performance of your solar modules is affected by the atmospheric temperature. The productivity of solar panel decreases with the rise in the ambient temperature. The temperature coefficient tells you the electrical behavior of your solar panel from a standard operating temperature of 25 °. The units of this coefficient is expressed in “% by ° C”, so the lower the coefficient, the better the solar panel is.
On the other hand, the higher the number, the less the photovoltaic module will produce power in case of strong heat or at the beginning of the afternoon. Most solar panels have a temperature coefficient of around -0.3% / °C to -0.7% / °C. For example, if a solar panels have a temperature coefficient of -0.37% / °C this means that for every 1°C above 25°C the solar panels decrease in efficiency by 0.37%. So, if your panels are at 35°C (95°F) and have an overall efficiency of 17%, then their true efficiency at that temperature will be closer to 16.4%.
We at Your Energy keeps all the above points in mind while selecting panels for a solar system installation. Feel free to call our advisors / fill our query form to know more about solar PV panel system installation.