A digest on key bullet points in regards of renewables, specifically on PV systems.

The mankind future sustainability will depend on how well and fast focuses itself on satisfying its energy demands from the renewables source resources by diminishing its strong dependence on fossil fuels sources. Hence, in the ability to change as fast as possible our conception dealing with the natural, vast and clean energy sources will rest the success of having a green planet in favor of our descendants. Besides, the economic growth have in the energy and its consumption the driving forces to speed it up; moreover the fact that there is huge amount of sunlight radiation that hits our planet is enough and convincing reason to undertake the energy transition from fossil fuels resources to renewables ones. Then, the biggest technological challenge would be to setup in the vast land extensions the solar panels, wind devices and other renewables sources facilities to power modern society, even when there is not a trivial amount of energy for covering its increasing energy demands. Thus, development and deployment limits to extend the renewables share in the global energy mix will rest on how much infrastructure each country is able to put round all those unused places, for impelling those challenges. 

The energy generation from renewable sources is an utmost important need for world targets on reaching out the carbon neutrality. Under these concerns, photovoltaic systems estimations regarding its increasing growth rate confirm them as the new king for the world electrical markets in the near future. PV systems to capture and convert in electricity as much of the sun’s light as possible, including the one reflected from the ground, lakes, rivers and so on; they must overcome several processes which are restrictive, regarding the limits established by the physics involved in the description of the phenomenon. Either the thermodynamic or the limits, from the materials features, manufacturing technologies and its designs make the efficiency of energy conversion a striking parameter to characterize these systems. 

Coherently, the better management of systems performance, the higher profits will be obtain. According to this, in regards of PV systems, nowadays for being a pace ahead so as to figure out the maximum power point of PV devices (operating point where the PV systems deliver its maximum energy), as close as possible; the main task will rest on decoding the pattern regarding the non-linearity I-V curves dynamics behavior, which is the utmost significance, what in turn is ruled out by the operational conditions changes.

Thus, the challenge of scientific researches dealing with this field, it is focused into simulation techniques to improve the operational efficiency estimations. The literature reinforces the fact on the use of statistical methods as the most common ones for PV power forecasting.

Models are mathematical or conceptual representations of real systems, which are deduced to understand and predict the main rules, which govern the behavior of the modeled parameter that can be measured. According to how many assumptions are taken to figure out and reproduce the phenomenon as a whole, the model might well lead to a degree of mismatch between the modeled and measured values. Thus, the success of the modeling relies on the reproducibility of the process, when the gap between the predictions and measurements is reduced.

Heat neither is a property of matter nor of energy, but it´s a temporary sign about a thermal equilibrium process is taking place among systems; hence, whenever the technology be able to retrieve the heat radiated, at bigger solid angles that the ones they receive the solar radiation, from PV modules to reuse it either as the caloric heat needed by others neighbor systems or speed up the thermal equilibrium with other ones and surroundings, by establishing the thermal way outs via manufacturing technologies and designs. Prior comment just reinforces the fact and significance that authors consider about temperature key role on these systems performance. The transcendental importance of the better management of PV modules temperature, it will always be an added value, where thermodynamically speaking we all would be wining.

Energy is neither created nor destroyed, but transformed or converted; that has been the great message given by nature to the first living beings that inhabited it. In the same way, it bequeathed us an additional one, when it deposited its most harmful energy resources (fossil fuels) in its entrails, so that it would be more difficult for us to use them. Humanity has interpreted this message in the way we all know, but the moment of transition of this thought matrix has arrived. Our planet wanted us to understand the message on a daily basis, and for that it gave us the sunlight, the wind, the waves, the tides, the waterfalls of rivers and lakes, the thermal springs, and so on; but the fact of having them so close, and coexisting with us, they were not considered as natural, clean, renewable and inexhaustible sources of energy. The guidelines have been established since we inhabited the planet, so the most effective way to make our environment less harmful to us, it has in the expansion, deployment, development and enhancement of renewable energy as its best ally. 

But also according to the message of Mother Nature that energy is neither created nor destroyed, but transformed, we must be able to be capable of any industrial, commercial, domestic or other project of any kind, which is undertaken it should be designed on the basis of concatenating from the energy point of view, all possible subsystems that compose them, thus the losses of some become the primary sources of others, in addition to the secondary energies, which as first conversion are the purpose of a given system. No subsystem should be isolated, so our salvation and that of the future heirs of our beloved planet will rest on the capacity and skill we have to concatenate as many systems as possible, leaving none isolated, and using renewable sources of primary energy as sources. 

That is energy efficiency.