## 4 Discussion
To some extent, in the case of using photovoltaic panels in a forest is much more complex, due to several factors involved as they are; shadows by trees that would affect the audio and video system by turning it off completely, checking every two months of the control boxes that may be affected by ants or nesting some bird. From the literary review, several authors present studies indicating that energy can be guaranteed, if the number of photovoltaic modules and the orientation of the greenhouse are correctly chosen for the latitude and the time of year [31], and the location of the modules is important when looking at reducing the shadow effects that can generate large energy losses [32]. Even, they have been made flexible panels to supply energy to autonomous systems and to replace the shading elements, thus achieving normal crop development [33; 34]. These studies show results of uses of photovoltaic panels to energize greenhouse ventilation systems (use of 3 to 4 photovoltaic panels, regular, inverter, battery) and research involving a detailed analysis of the operation of the photovoltaic panel. For our case, it is the same principle and components for energizing an audio and video system. In general, there is little information from studies submitted where results of the operation of photovoltaic facilities in forests are installed and analyzed for the acquisition and recording of the fauna information of the site. The total cost of the project to build, install and put into operation the 5 audio and video boxes (3 stations with metal structures and 2 boxes placed in the treetops), is $3400, being the price of the $500 information acquisition module (microphone, camera, box, data acquisition system) and photovoltaic stations are priced at $300 dollars (polycrystalline solar panels, regulator, inverter, cables, and aufons, and sensors, the cost of metallic materials is not considered for reasons that are reused). From an economic point of view, the installation of autonomous photovoltaic stations is economically feasible from the above-mentioned in relation to the installation of a central photovoltaic plant of 1000 W, in addition to being a protected area, large installation cannot be performed. In the future it is intended to install more module in the treetops with a small photovoltaic panel of 25 W.  
On the other hand, it is important to note that prior to the installation of photovoltaic stations, solar irradiation of the site was recorded for two years, in order to determine the optimal angle of inclination of photovoltaic breads (angle between 10\({}^{\circ}\) to 12\({}^{\circ}\)). This arduous process was carried out because the photovoltaic panels when fixed in the direction of the North, it should be considered the summer and winter seasons especially this last where the trees sprout. By way of example as results we can indicate that, the minimum irradiation in the area at the \"Mirador\" station was 3.13 kWh/m\({}^{2}\) day. From the above, it is essential to select a set of accumulation system as is the case of the battery that will serve us to store energy for at least 3 days of autonomy, especially in the case of summer in the case of Ecuador, between the months of June, July, and August present the low irradiations of the year. In the case of inverters and regulators, it is recommended to use voltages 12 V for low current, in addition to the structure covering such equipment, in order to avoid the entry of insects that shorten the life of such complements. As has been explained in the results of the article, the use of Arduninos for the control of lighting at night times, and, for recording energy consumption, you can analyze and quantify the energy consumed by the audio and energy-efficient equipment connected by trail visitors (cell phones, tables, cameras).