25th November 2020
Solar Panel Efficiency 2021
  • BY : Ellen Ra
Solar Energy 2021
  • BY : Ellen Ra
  • 25th November 2020

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Solar Panel Efficiency 2021

Are you considering shifting from the centralized power system to solar energy but aren’t sure about its efficiency?

Have you been wondering about the steps to make solar panels more efficient?

Or do you simply want to learn how solar energy works?

Then you came to the right place!

There are many reasons why you should choose the distributed generation system over the centralized power system. The most important one has always been to take advantage of the former’s higher efficiency. A centralized power plant transmits energy over long distances, meaning that some of the energy transmitted is lost. A typically distributed energy technology like solar carries the energy over shorter distances, as the consumers are always closer to the source. That ensures less waste and increased efficiency. You can also imagine how many losses in service you get to avoid per unit distance while using the new model compared to the old model.

So, how efficient are solar panels?

The efficiency of solar panels

First of all, I need to mention that solar panel efficiency is simply the solar panel’s ability to convert the sun’s rays into usable power. This conversion capacity is an essential metric because a more efficient panel means more electricity.

Typical efficiency range

The efficiency of most solar panels lies between 15 percent and 20 percent, but there are outliers on both sides of the spectrum. There are high-quality solar panels whose efficiency is known to reach 27 percent, but most photovoltaic panels you’ll find today never go beyond 22 percent.

What determines the efficiency of solar paneling?

Several factors shape a solar panel’s efficiency. The efficiency of a solar panel depends on how much sunlight the solar panel converts into useful electricity. Nonetheless, some factors directly impact the conversion rate. They are the same ones that solar cell researchers and solar panel manufacturers consider when creating product designs and the actual solar panels.

Reflection, material, wiring, and busing are the main factors that people consider. Here’s a summary of what each one of them means:

  1. Reflection- the more light reflected from the panel, the lower its efficiency. This process is precisely why you’ll see a glass layer well fixed on top of silicon solar cells.
  2. Wiring and busing- how the wires and busbars are organized on solar panels directly influences how much electricity it obtains from sunlight.
  3. Material – solar panels consist of different materials, including monocrystalline silicon, thin-film, and polycrystalline silicon. Each one of these materials contributes to electricity generation differently.

Notably, “material” is often the most critical factor in solar paneling. It thus forms the basis of the next section of this article.

The three major types of solar panels and their characteristics


Monocrystalline is undoubtedly the most expensive type of solar panels, and for a good reason: they are the most efficient, providing efficient energy ratings of between 22 percent and 27 percent. As a consumer, therefore, you are bound to benefit most from this type- financially.

A crystal of the silicon used for this system is typically grown in a highly complex process that produces a lengthy rod. This rod then undergoes a process that involves cutting it into precise wafers used to make the solar cells.

As you can imagine, this type of solar panel is generally expensive because of its high upfront costs. However, the investment is always recovered quickly as a result of the lowered average monthly rates. The fact that they take the least space also makes them a particularly great option for a homeowner with a smaller home or high energy needs.

Did you know that monocrystalline panels are the longest lasting panels? They often come with a 25-year warranty, so you get the picture.


A polycrystalline solar paneling system is generally less efficient than a monocrystalline system. Instead of the silicon being grown as one cell in the monocrystalline system, the prior comes from a block of crystals, which are then cut into precise wafers to create an individual solar cell.

At the moment, a polycrystalline solar panel yields an efficiency of between 15 percent and 22 percent. This solar paneling system is often for people with flat roofs and minimal distractions. It is, however, most ideal for a homeowner who doesn’t have extensive energy requirements, as well as one who wants lower initial costs.

These kinds of solar panels usually come with a 20-year warranty.

Thin film

A thin-film solar panel is created by layering a glass, plastic, or metal substrate with one or more slim layers of photovoltaic material. As you’d expect, a thin film solar panel is often flexible and light, though they typically degrade faster than monocrystalline and polycrystalline solar panels.

The production process of a thin film solar panel is less complicated, and their output is therefore 5 percent less than that of the monocrystalline solar panel. These panels, therefore, deliver within a range of 15 percent to 22 percent solar panel efficiency.

Quite notably, this product type closes the efficiency gap with the more expensive kinds of solar panels. That’s why you’ll often see them installed on massive projects and large scale solar power plants.

This kind of solar paneling usually comes with a 15 to 20-year warranty.

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Recent trends in Solar Panel Efficiency 2021

As you have already noticed, one of the biggest challenges of photovoltaic technology is the fact that solar cells are only able to convert into electric power between 15 percent and 27 percent of the sunlight they receive. Scientists have been working endlessly to find ways to boost solar panel efficiency. Here’s what they’ve come up with so far:

Light-sensitive nanoparticles

The University of Toronto developed a kind of light-sensitive nanoparticle known as “colloidal quantum dots.” These are a novel and better way to receive solar energy with two types of semiconductors known as the “n-type” and “p-type.” These semiconductors are generally unable to bind with oxygen, making them better able to operate outdoors without the typical oxygen-related limitations like rusting. They also have better light absorption capacity.

Gallium Arsenide

The Imperial College University in London created a new element known as “Gallium Arsenide” that boosts the solar photovoltaic systems’ efficiency by three times. It does so by creating a kind of chemical-based tempering on the system’s triple-junction cells to increase its ability to capture sunlight. The models the team created utilize a sensor-driven view that can bring sunshine in the system using some kind of “light pipes.”

Better built-in batteries

Ohio State University developed a solar battery that is 25 percent cheaper and 20 percent more efficient than the existing products in the market. The project that was funded by the U.S Department of Energy saw the creation of . battery that seems to house an in-built solar panel that enables it to be recharged as many times as required.


There is a lot of competitiveness in the solar energy market. China and India are emerging giants and world leaders in the realm of solar panel efficiency development. This sheer competitiveness will always lead to reduced solar panel prices and better products, which, in my opinion, will remain to be the most prominent Solar Panel Efficiency 2021 trends.

Thank You so much for your time,

Ellen Ra
Love Solar Energy

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