5 research outputs found
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 Comparative Analysis Between Battery‐ and Solar‐Powered Wireless Sensors for Soil Water Monitoring
Wireless sensor networks (WSN) have found wide applications in many fields (such as agriculture) over last few years, and research interest is constantly increasing. However, power supply to the sensor nodes remains an issue to be resolved. Batteries are usually used to power the sensor nodes, but they have a limited lifetime, so solar energy harvesters are a good alternative solution. This study provides a comparative analysis between battery and solar energy harvesters for sensor nodes used for soil water monitoring. Experimental results show that small‐sized solar panels with low‐power energy harvester circuits and rechargeable batteries distinctly outperform secondary batteries in outdoor and continuous‐operation applications. The power level of the energy storage device of sensor node 1, which was powered by a small PV panel, remained constantly close to 90% for all days. The power of the other three nodes, which were powered by a rechargeable battery, was initially at 100% of the charge and gradually started to reduce. Sensor node 1 performed a total of 1288 activations during the experimental period, while sensor nodes 2 and 4 behaved satisfactorily and performed a total of 781 and 803 activations, respectively. In contrast, sensor node 3 did not exhibit the same behavior throughout the experiments. © 2022 by the authors. Licensee MDPI, Basel, Switzerland