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Residential PV Self-Consumption: Real Savings in a Spanish Household
H.-J. Rodríguez San Segundo, N. López
Economic Analysis, Performance, Prosumer, Residential Systems
PV Applications and Integration
Subtopic: PV Driven Energy Management and System Integration
Event: 37th European Photovoltaic Solar Energy Conference and Exhibition
Session: 6BV.5.30
1865 - 1868
ISBN: 3-936338-73-6
Paper DOI: 10.4229/EUPVSEC20202020-6BV.5.30
0,00 EUR
Document(s): paper, poster


The purpose of this work is to evaluate the real impact of a solar PV installation in self-consumption scheme on the household economics of a Spanish home located in the South Western region with over 1,600 average equivalent sun-hours per year. To that purpose, a 1.5 kWp PV system has been monitored from its installation date in June, 2018. The impact of PV production on consumption, compared to the time before PV, has been assessed, both in terms of energy (kWh) and savings in the monthly electricity bill (€). The work has also taken into account the kWh retail price variations. Year-on-year energy (kWh) savings have reached an average of 45%. Economic (€) savings are in the range of 28%, despite two limiting facts: a.) retail prices increased an average of 6% in the period of study and b.) the Spanish electricity bill includes items unrelated to consumption, which can add up to 50% of the bill. Another aspect of the work has been the simulation of the savings along the life of the PV system. It establishes that the simple payback time (STP) ranges from 14 years in net-metering scheme and upfront payment of the system, to 24 years in self-consumption scheme and 10-year financing.