How much energy poly solar panel takes from sun?
There are two main types of poly solar panel: mono- and poly crystalline. Mono crystalline ones work slightly better than polycrystalline ones due to higher efficiency.
There are panel sellers who say that they have “special” solar panels designed for northern latitudes. Panels do not need direct solar radiation, because they run on ultraviolet (UV) light. They work even in cloudy weather, when the sky lead-color, supposedly because UV doesn’t trap by clouds, but freely passes through them.
Let’s figure out if this really is and how efficiently poly solar panel work from ultraviolet radiation.
First, a little about the Sun
Our Sun is a giant natural thermonuclear reactor in the sky that continuously releases massive amounts of energy. If we compare the Sun with other “celestial” thermonuclear reactors, then it eclipses 85% of the stars in our galaxy.
How powerful is poly solar panel?
For example, if you take:
- all the energy that humanity produces by burning coal, oil and natural gas
- energy from uranium fission in nuclear reactors at nuclear power plants
- all wind energy
And let’s summarize all this for a year; this obtained value is approximately equal to the energy that the Earth receives from the Sun in 7 seconds! At the same time, it must say that only 0.00000005% of the energy generated by the Sun falls on the Earth.
How much energy poly solar panel takes from sun?
This energy reaches the Earth in the form of photons and these photons have different wavelengths, the shorter the wavelength, the more energy it carries. So, poly solar panel carries 2 times more energy than a “red” photon (wavelength 720nm).
Possibility of selling surplus to the network
The most important difference between these two inverters is that has the ability to sell surplus electricity to the grid. This means that if your solar array is generating more electricity than you are consuming. The inverter can channel that surplus into the city grid.
With the help of a special bi-directional counter, you can receive passive income from the state. The meter will count how much electricity you consumed. Similarly, how much you gave away the surplus, then, at the end of the month, reduce debit and credit, and identify who owes whom.
What from the Sun reaches the Earth’s surface
If you look at the composition of sunlight reaching the Earth, then 4% of it is ultraviolet, 43% is visible light and 53% is from the infrared range. Most poly solar panel work in the visible range, also capture about half of the infrared range and only the smallest part of the ultraviolet range.
Sunlight in space
As you already know, the Sun is a gigantic, uncontrolled nuclear reactor and you might think that it creates a huge amount of dangerous radiation. And you will be damn right. There is only one BUT. Nuclear reactions take place deep in the core of the Sun and, due to its gigantic size, radiation simply cannot escape.
How to get high-quality poly solar panel?
Light on its own can have a hard time getting out of the poly solar panel. For example, it may take a photon 100,000 years to travel from the core to the surface of the Sun. But from there it takes a photon 8 minutes and 20 seconds to meet someone’s solar panel.
Compared to the total radiated energy, the Sun produces only a small amount of high-energy radiation, such as X-rays or gamma rays. But for fragile organic beings (that is, people), even a small amount of such radiation can become significant.
Sunlight on the surface of the earth
By the time solar radiation reaches the Earth’s upper atmosphere, it will be approximately 1366W / m² (data link, satellite). After passing through the atmosphere, the radiation intensity will decrease by 18% and amount to 1120W / m². You just need to keep in mind that this intensity will be only at noon, only at the equator and only on a clear day.
Since the conditions are rarely ideal, the Standard Test Conditions (STC) for poly solar panel is a radiation intensity of 1000W / m². This means that if you have a solar panel with a rated power of 300W, then it will give out this number of watts at a solar radiation intensity of 1000W per square meter.
Solar spectrum
The diagram shows how much solar radiation reaches the Earth’s surface. The yellow area of the diagram shows the amount of sunlight entering the upper boundary of the atmosphere, and the red area shows how much reaches the earth’s surface.
Ultraviolet Solar Panels
At noon, in the equatorial region, we trap ~ 18% of the poly solar panel passing through it. However, the graph above does not a snapshot take at the equator at noon in ideal weather conditions, but a representative snapshot of solar radiation falling generally on Earth.
Therefore, it can be seen from the graph that the atmosphere absorbs more than only 18% of the transmitted light. In the morning and evening, the sun’s rays must pass through a thicker layer of the atmosphere before reaching the ground.
Also higher latitude coordinates have a similar effect.
Poly solar panel can absorb and transform some of the UV rays. This part gets a little larger as it moves into the visible region. The graph also clearly shows that solar panels generate a significant portion of their electricity from photons.
One 150W single-crystal solar battery was installed on the roof of the country house in combination with a 20A PWM charge controller. The system was assembled at 12V, i.e. with one battery. The inverter is also powered by 12V. The main task of the solar power plant is recharging smartphones, tablets, lighting 220V, powering a small LCD TV.
What should be powered by solar panels?
- Lighting for ~ 220V through an inverter
- LCD TV
- Recharging smartphones, tablets, laptops and other gadgets
- Lighting
Summary
In contrast to the UV region, in the infrared part of the spectrum we see a vertical dip in absorption. We can say a cutoff at a wavelength of 1100nm. Such a cutoff in absorption is due to the fact that the wavelength of light becomes larger than the size of a silicon atom. That is, silicon becomes transparent for wavelengths of 1100nm and above.
