Operation of the photovoltaic system in Prague and data evaluation

Received: January 6th, 2021 ; Accepted: April 7th 2021 ; Published: April 12th 2021 ; Correspondence: [email protected] on-grid photovoltaic system was installed at the Faculty of Engineering in 2015. The monitoring system developed in our laboratory monitors data and can also detect failure and type of failure. The evaluation of the data shows that the amount of electricity produced slightly exceeds the expected values predicted by the internationally used internet application PVGIS. The effect of the aging of PV panels has so far had a minimal effect on the electricity produced. Immediate output power is affected by multiple parameters. Higher temperatures reduce the efficiency of energy conversion, so in summer the instantaneous power may be lower even at higher radiation intensity and smaller angle of incidence

Design and data comparison of the photovoltaic power plants in the southern and northern hemispheres

We have recently developed a unique monitoring system for photovoltaic power plants and have gradually improved it in recent years. The system is installed at about 80 power plants in several European countries and at one power plant in Chile. We collect and evaluate all data in our laboratory. In this paper we describe the unique design of a photovoltaic power plant in the southern hemisphere in Chile with photovoltaic panels installed on tracking stands. We present the evaluated data and we discuss their comparison with photovoltaic power plants installed in Europe. We also discuss different solar conditions of these locations

Autonomous photovoltaic system for night-time lighting in the stable

ArticleAutonomous photovoltaic (PV) systems are suitable, for example, for powering various appliances or scientific instruments in the field, for automatic data collection, for signaling, etc. At the Czech University of Life Sciences Prague, we have designed an experimental autonomous PV system designed for night-time lighting for orientating in a stable for horses. The article describes the construction of a PV system with a PV panel rated at 170 Wp, with a lead-acid accumulator and a 1,5 W LED light source. The data collection was automated. The data evaluation shows that during the whole year, the PV system has been recharged and there was no lighting failure. The paper also presents important measured characteristics

A simple method of goal-directed lossy synthesis and network optimization

A simple method for synthesis of goal – directed lossy filters is described in the present paper. This method of synthesis is based on the application of optimization procedures used in usually accessible professional software for network analysis. The presented method of network optimization enable to improve network performance without requirement of special numerical programs what brings new possibility for many designers in area of network design and optimization

Reviving American entrepreneurship? tax reform and business dynamism

The 2017 Tax Cuts and Jobs Act slashed tax rates on business income and introduced immediate expensing of investments. Using a quantitative heterogeneous firms model, we investigate the long-run effects of such tax reforms on firm dynamics. We find that they can substantially increase business dynamism, potentially off-setting the large decline in the U.S. startup rate observed over recent decades. This result is driven by indirect equilibrium forces: the tax reform stimulates firm entry, leading to an increase in labor demand and wages, which in turn makes firm selection more stringent. Related to this is a large boost of the number of firms and of aggregate output, investment and employment