Evaluation of energy obtained from solar panel loaded directly and with microinverter
2020
Pelece, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Putans, H., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Ziemelis, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Kancevica, L., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Ivanovs, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
The article deals with use of solar panels directly for heating of water with active resistance. For achieving the maximum power it is important to use correct value of resistance. At optimal working conditions (most important is high solar irradiance) this value can be obtained from data given by the panel’s producers, but for lower solar irradiances the optimal resistance is higher than that. In this article the energy amount obtained from a solar panel loaded with constant resistance (long-term optimal for local conditions) is compared with that obtained from an equal panel using the solar invertor Enphase with MPPM function. The Enphase Microinverter converts the DC output of the PV module into grid-compliant AC power. Manufacturers claim that in addition to performing the DC to AC conversion, it maximizes energy production by using a sophisticated Maximum Power Point Tracking (MPPT) algorithm. This integrated system maximizes the energy harvest, increases the system reliability, and simplifies the design, installation and management. We wanted to check how big the benefit from use of this Microinverter is. The obtained results show that with constant active resistance the harvested energy amount from July till October is approximately 77 % from that registered with the Enphase Microinverter at the same time.
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