Solar panel manufactured in Asia or Europe? – What comes out most profitable?

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2 – General data of the photovoltaic installation:

Installation (A): 15kW of solar panels “German brand” but of Chinese origin

Installation (B): 15kW of German solar panels made in Germany

Location: Lisbon region, Portugal (No more accurate data are provided to preserve the privacy of the owner of both facilities)

Installation: Flat roof with same orientation and inclination. Twin pv systems.

That is to say, we have two exactly identical pv plants, in the same location, with the same orientation, same inclination … etc. Even the installer who made both systems was the same company.

3 – Straight to the point: Production and comparison data

Well, as we say colloquially, “let’s go to the trouble”, and as to learn to swim say that it is better to jump into the pool, here is a first screenshot production last September 2017:

gráfico de producción Septiembre 2017 placa solar China y Alemana

Do you guess which color corresponds to each installation ?;

In fact, the RED bars are the German brand made in Germany (which we have named Installation B), and the BLUES to the “German brand” made in China (which we have named Installation A).

We will see everything in more detail with a table of productions of the month of June 2017 of each system, as well as the difference of production in kWh and in% between both facilities.

Tabla de producciones Junio 2017 panel solar Chino y panel solar Alemán

ach column is:

  • First column: Date of measurement.
  • Second column: Energy from the pv system with Chinese panels.
  • Third column: Energy from the pv system with German panels.
  • Fourth column: Energy production difference between both pv systems in kWh.
  • Fifth column: Difference between both pv systems in %.

The comparison table leaves no doubt, the production difference, in the month of June 2017, is around 22% better with the solar panel manufactured in Germany than with the solar panel manufactured in China.

4 – So … is it more or less profitable?

In the end this is the fundamental and what should concern us:

“It seems clear that, generally speaking, the higher the panel quality, the better the production results. But is it more profitable? “

Well, let’s now look at the same table but with the kWh / kWp ratio, ie how much energy is generated in each of the facilities for each kWp installed:

Tabla ratios de energía por potencia instalada

Each column is:

  • First column: Date of measurement.
  • Second column: Energy from the pv system with Chinese panels.
  • Third column: Performance kWh/kWp from the pv system with Chinese panels.
  • Fourth column: Energy from the pv system with German panels.
  • Fifth column: Difference between both pv systems in kWh/kWp.

This, the kWh / kWp ratio is the fundamental data that must always be taken into account when calculating the profitability of an installation, and NOT the price of the panel Wp.

A photovoltaic plant is an energy generation system, ie such an installation is more profitable the more energy we can generate with the same amount of installed power.

We explain it with a more “visual” example:

Mr Schmidt has bought an electronic device, made in Germany, which helps him to save 3 hours a day of electrical consumption.

Mr. Chen has bought the same device, made in China, something cheaper, but that helps him to save 2.5 hours a day of electrical consumption.

In the end, Mr. Chen has saved a few euros but after a year Mr. Schmidt has saved 182.5 hours of consumption more than Mr. Chen.

Going back to the case at hand, a photovoltaic installation should work for 30-40 years. That is to say, it will generate energy during all the days of its useful life, that if we put that they are 30 years, we speak of 10,950 days producing, and for each of those 10,950 days we can choose to pay something less for a panel cheaper and have a “normal” production, or choose a higher quality material and produce 10-15% more on average each and every 10,950 days than if we had chosen the other cheap option.

As is often the case with almost everything we buy in everyday life, the best and most satisfactory results are usually achieved with the highest quality materials.

5 – Conclusions:

In the end, considering that a photovoltaic system measures its profitability according to the energy produced (kWh) per kilowatt installed (kWp), it turns out that it is always much more profitable a panel of maximum quality, although the initial investment.

The data of both manufacturers have not been disclosed to protect the privacy of the owner of the photovoltaic installation under study, but we are able to inform that they are 2 of the brands of solar plates more known and used in the current photovoltaic sector.

Of course with this it can not be deduced that all solar panels manufactured in China and / or all manufactured in Germany will give this result, but there is no doubt that if it is a valuable report as a basis for meditation before deciding which materials we will use it in an installation and what is the correct way to analyze its profitability.

After the data thrown in with this actual experiment in operation, do you still think that it pays to save a few euros on a cheap solar panel and not invest something more in quality?

Report developed by the technical department of SunFields Europe

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