Rooftop solar panels: are the best commercial solar panels

Solar system

Rooftop Solar Panels Are The Best Commercial Solar Panels Aug 04,2023

Have you been following the European Solar Rooftop Initiative announced by the European Union on May 18th? In the program, the EU claims to be able to solve nearly 25% of its electricity consumption through solar panel rooftops, a figure that is more than today's share of natural gas. Solar panel rooftops have become an energy issue for the whole of Europe. Sunkean, a company dedicated to solving the global PV energy problem, has launched solar panels specifically designed for European rooftops.

Ⅰ. Solar panels on the roof

1. What is a solar panel rooftop?

A solar panel rooftop is a photovoltaic system in which electricity-generating solar panels are installed on the roof of a residential or commercial building or structure. The individual components of the system include rooftop solar panels, mounting systems, cables, solar inverters, and other electrical accessories.

2. Solar panels on the roof VS ground mounted solar panels

A. Different subjects and functions.
The main body of the purchase of grounding solar panels is generally public units, the purpose is to supply power to the general citizens. The high demand for power supply dictates that it requires large sites such as large deserts and wastelands to build centralized PV systems. Rooftop solar is mostly used by private users and businesses for domestic and commercial purposes and thus is generally built on rooftops and corporate buildings.
B. Installation Difficulty

Ground mounted solar panels need to be built on the ground system, the difficulty of completing the ground system requires strong cost support, and the construction is also very difficult. And solar panels rooftop is installed on the roof. There is no ground system to consider but to take into account the European roof slope degree and other conditions.

Ⅱ. Commercial solar panels

1. What are commercial solar panels?

Commercial solar panels are used for commercial purposes and are generally purchased and installed by businesses. The difference between commercial solar panels and residential solar panels is the size and number of panels.
Commercial solar panels are arrays of photovoltaic solar panels that convert sunlight into electricity.
2. Commercial solar panels VS residential solar panels
The average home solar panel has an efficiency of about 20%, while commercial solar panels are usually closer to 22%. This is because businesses can afford to pay for the highest efficiency solar panels due to larger projects and higher budgets.
3. How much do commercial solar panels cost?
In China, for example, the average cost of electricity for the commercial solar panels version is about $0.64 per watt. This price is lower than manufacturing plants in countries like Australia and Europe.

Ⅲ. Why solar panel rooftop is the best commercial solar panels?

1. Business conditions are suitable for the installation of solar panel rooftop

Enterprises do not have the space to build a system for ground mounted solar panels as large as a desert or wilderness, nor do they have the funds and rights to support public power generation programs. Enterprises are generally suitable for rooftop solar panels, building rooftop solar energy in different outer layers of the building, such as the building-integrated power generation system. Of course, centralized power generation systems are also suitable for businesses.
2. Solar panels rooftop have the following pros
A: Saving money for businesses: low LOCE
What is LOCE: Levelized Cost of Generation, which refers to the total cost of energy generation divided by the total life cycle produced energy. Low LOCE means lower costs.
Solar panel rooftops' high efficiency and low cost per unit determines its low LOCE, which can save a lot of money for enterprises.

B. Resistant to salt spray corrosion and ammonia: high efficiency

High power output reduces BOS costs and has a lower temperature coefficient. Salt spray is a corrosive agent that reduces the power output of PV modules. Salt spray corrosion usually occurs at the seaside or under high humidity and heavy rainfall conditions. It affects critical components such as junction boxes, glass, frames, etc., thereby reducing the performance and lifetime of the PV module. The same goes for ammonia.

Sunkean's solar panels designed specifically for European rooftops are resistant to salt spray corrosion and ammonia, and high power conductive electricity.

C. Strong resistance to potentially induced degradation: long lifetime
Potential Induced Degradation (PID) is caused by a high potential difference between the semiconductor material (cell) and the rest of the module (glass, bracket, or aluminum frame). This potential difference creates a current leakage that causes negative and positive ions to migrate. Negative ions flow out through the aluminum frame, while positive ions (sodium ions) migrate to the surface of the cell. These ions "contaminate" the cell and reduce its photoelectric effect, resulting in power loss.

Sunkean's solar panels designed for European rooftops have excellent resistance to potential-induced attenuation, as demonstrated below. Because of this ability, this solar panel has a minimum lifetime of 25 years.

D. Use of TOP Con Cells: High Conversion Rates
The basic principle of the TOPCon cell, i.e. Tunneling Oxide Monetization Contact Cell, is to deposit a very thin layer of silicon oxide on the backside of N-type silicon wafers, and then deposit a thin layer of silicon oxide on the backside of the wafers.
The basic principle is to deposit a very thin layer of silicon oxide on the backside of an N-type silicon wafer, and then deposit a layer of rewired multi-polymer silicon film to realize the backside passivation contact. Increase the open-circuit voltage and improve conversion efficiency. The industry's TOPCon cell has a mass production conversion efficiency of over 24%.

Sunkean's solar panels designed for European rooftops utilize this TOP Con cell.

E. Lightweight and less difficult to install
Because solar panels generally run on the roof for 30 years, considering the difficulty of installing them on the roof, versus the loading capacity of the entire roof, lightweight solar panels are more suitable for installation on the roof.
Regardless of the type of roof, installing solar energy on the roof requires the assembled solar panels to be mounted on solar panel racking. In this regard, the lighter the solar panel, the easier it is to transport and assemble. And the bracket has a limited ability to support the solar panels, the lighter the solar panels the less destructive force they will have on the bracket. At the same time, lightweight solar will not put undue stress on the architecture of the house.
SUNKEAN's three types of European rooftop solar panels are all less than 20kg in weight, and all have a conversion rate of around 25%. The 240w solar panel's size is 1152 x 954 x 30 mm with a mass of 11.5kg, the 280w size is 1336 x 954 x 30 mm with a mass of 13.2kg, and the 340w size is 1616 x 954 x 30 mm with a mass of 16kg.

4. Responding to the European Solar Rooftop Initiative

As a company, it has the responsibility to join the social energy conservation and walk in the front of energy saving and emission reduction. In the European Solar Rooftop Initiative, it is mandatory to install rooftop solar energy in the following buildings: by 2026, all new public and commercial buildings with a usable area of more than 250 square meters; by 2027, all existing public and commercial buildings with a usable area of more than 250 square meters.

If you also want to contribute your part to EU rooftop solar, you are welcome to buy Sunkean's solar energy specially designed for European rooftops. In addition to the above benefits, we have customized our rooftop solar panels in two different sizes, which adapt to European roofs. For more information contact us! Email: wendy@ske-tech.com

Ⅳ. How to install solar panels on your roof?

As shown in the video below, you can learn about commercial solar panel installation.