Micro inverters, with a distributed orientation and unlike a conventional inverter that had a centralized installation approach, are installed behind each solar panel and convert direct current electricity to alternating current, just below the panel. All micro inverters can be connected directly to the home network, independently of the other micro inverters in the system. When a panel is shaded, for example, it will in no way affect the performance of the other panels. The main objective of this work is to evaluate the efficiency and regulation of the 250W grid connection micro inverter operating in the geographical and climatic conditions of 3800 meters above sea level, to improve the operation of these systems in the area. from Puno. If the evaluation and regulation of the micro inverter will be carried out, we will have better efficiency in the work of this team, which is the micro inverter. The methodology will go with the correct voltage found through a technique called Maximum Power Point Tracking or MPPT. When the maximum power point is applied at the panel level rather than a system as a whole. Performance will increase dramatically, bringing a better solution to the customer. Finally, a measurement system was used that helped us to collect data. As a result, the efficiency of our micro inverter is greater than 90 percent, at the same time it works with power factors very close to unity, if the equipment works at a capacity greater than 20%, on the date of analysis the maximum efficiency was 93.215%. One of the conclusions in this case, as the power of the micro inverter is greater than that of the photovoltaic generator, does not have limitations or what guarantees that it operates in optimal conditions.

The paper work entitled: "Methodology for the design of a static pressure test bench, to verify the absence of leaks and physical damage in drinking water meters", has as a general objective to apply the design engineering method of Michael French, to design a static pressure test bench to verify the absence of leaks and physical damage in drinking water meters and as specific objectives: Determine the technical parameters, the selection of components and instruments of the test bench to meet the requirements of the verification procedure of drinking water meters from the National Quality Institute. Also make the plans and an operation manual of the test bench. The research is of the descriptive-applicative type because a solution to the problem was sought, using the design methodology of Michael French, where the analysis of the problem was carried out, formulating the need in terms of functions and sub-functions, the conceptual design where a variety of solutions to the problem, the representation of schemes where the most promising solutions were represented as sketches and the development of detail where a memory of the design of all the parts was made; All this was improved by carrying out a bibliographic review of books, articles, research projects, manufacturers' technical sheets and others. The final design of a static pressure test bench was obtained as results to verify the absence of leaks and physical damage in drinking water meters under controlled operating conditions, the equipment plans and the operation manual. It is concluded that using a design methodology helps to establish in an orderly and structured way the steps to make an optimal machine, according to the client's needs.

For the safe operation and control of battery deterioration, thermal monitoring is extremely important. The performance of a battery energy system and its accuracy in State of Charge (SoC) (%) estimation for electric boats and electric vehicles are significantly influenced by ambient temperature. In this study, the battery will operate at extreme temperatures within Titicaca Lake, located at an altitude of 3850 meters above sea level. Therefore, the objective is to study a battery model that considers ambient and extreme temperatures. The cell must operate at critical values with a current of 150 A, a voltage of 3.65 V, and observe thermal aging that affects the capacity due to multiple charges and discharges. The method applied to lithium iron phosphate batteries LiFePO4 involved wear testing, considering three stress factors (time, temperature, and state of charge (SoC) (%)). Capacity measurements and resistance calculations tracked short-term degradation behaviors. The Shepherd model was established to identify battery aging using a simple but accurate two-step nonlinear regression approach; also, the thermal analysis of the battery cell was conducted to identify the most critical zone of the cell in terms of heat generation. This analysis allowed us to maximize heat dissipation with only a forced air fan mounted on the vital region. For further evaluation of the proposed strategies, a computational fluid dynamics (CFD) model was built in COMSOL Multiphysics® and validated with a thermographic camera to identify the temperature in the cells. The final arrangement of the LiFePO4 battery is the 16s1p prismatic cell type (16 cells in series and one parallel), with the cell experiencing a temperature variation of approximately 1° C higher than that of the outer parts.