Analysis of the Self-Consumption Regulation for Photovoltaic Systems with Battery Banks in the Portuguese Residential Sector

Abstract

Abstract-Following recent trends in the developed countries, Portugal recently cut down the Feed-in tariffs for photovoltaic energy. They are now based on the Iberian market average (around 0.04€/kWh) while the final consumer electricity price is 0.16€/kWh. In this view, the PV system should be dimensioned for self-consumption since injecting into the grid produces less revenue. The motivation for the current work was to analyse the changes due to this new regulation, through the analysis of the economic feasibility of different size PV systems (1kW, 3kW, and 5kW), considering the selfconsumption regime with a battery bank as an option. We also compare the most profitable cities in Portugal with and without the use of a battery bank. The results show that the PV systems with battery banks are not as profitable as standalone PV systems in the Portuguese self-consumption regime. This is mainly due to the high price of the battery bank. In general, the mainland results are better than the islands for the 1kW and 3kW PV systems. In spite of the higher initial investment cost, the islands present better results for the 5kW PV system. In general, it can be stated that the investment in PV systems is highly conditioned by external economical factors that continuously change and the current work analyses the current situation in Portugal for different installed powers with or without battery banks.

Influence of Occupant Behaviour on the State of Charge of a Storage Battery in a nearly-Zero Energy Building

“…As far as PV technology gets technically and commercially mature, in Portugal, such as in most developed countries, the trend was to reduce Feed-intariffs (FiT) for renewable sources [7]. The FiT started with a value of 0.65€/kWh (DL 363/2007) and at present around to 0.09€/kWh while the electricity prices for the residential sector increases (the final consumer electricity price is 0.16 €/kWh) [8]. Taking into account this situation, generating electricity on-site on the household is more attractive than feeding into the grid.…”

Economic Analysis for Residential Solar PV Systems Based on Different Demand Charge Tariffs

“…He argued that if the price of the PV systems falls down, it is reasonable to use the PV system as the primary source of energy for Nigeria when its average daily solar radiation is between 4 and 6 KW/m 2 /day [28]. Many other researchers investigated the potential usage of PV systems for different parts of the world like China, Portugal and so forth [29][30][31]. Considering so many investigations, it can be concluded that in many locations in the world energy can be supplied with the help of PV systems.…”