Frequently Asked Questions
Everything you need to know about solar energy, Net Billing, photovoltaic systems, batteries, installation and energy savings.
How do solar panels work and how efficient are they?
Solar panels convert sunlight into direct current (DC) through the photovoltaic effect. Modern n-type TOPCon panels can offer efficiency of around 22–23% and continue producing energy on cloudy days, although with reduced output.
What is the role of the inverter?
The inverter converts direct current (DC) generated by the panels into alternating current (AC) used by household electrical appliances. Hybrid inverters can also manage energy between the solar panels, battery, loads and grid.
What is Net Billing and how is it different from Net Metering?
Net Billing replaced Net Metering for new applications from 2024. Under Net Billing, electricity consumed at the time it is produced directly covers consumption, while surplus electricity is exported to the grid and compensated according to the applicable market framework.
How much space is required for a photovoltaic installation?
Approximately 5–6 m² of roof area are required for every 1 kWp on a tiled roof. On a flat roof, approximately 8–10 m² may be required in order to reduce shading between the panels.
How much electricity can a photovoltaic system produce in Greece?
In Greece, 1 kWp of installed photovoltaic capacity can produce approximately 1,350–1,550 kWh per year, depending on the location, orientation, inclination and shading.
How long do solar panels and inverters last?
Solar panels have no moving parts, which helps minimize mechanical wear. Manufacturers commonly provide long-term performance warranties, while inverter warranties and expected service life vary depending on the manufacturer and model.
Why is a battery useful with Net Billing?
A battery can store solar energy produced during the day and make it available later, particularly during evening hours. It can also support electric vehicle charging and, with compatible equipment, provide backup power during a grid outage.
How much additional savings can a battery provide?
The savings depend on the household’s consumption profile, system size, electricity prices, battery capacity and operating conditions. A battery can increase self-consumption by allowing more solar energy to be used instead of exported.
What are the main stages of the installation process?
The process includes study and system sizing, analysis of consumption and site inspection, submission of the required application to DEDDIE, installation and certification, followed by grid activation and system monitoring.
Can a photovoltaic system provide energy independence?
A photovoltaic system can significantly reduce dependence on grid electricity. Combining solar panels with battery storage can further increase self-consumption and energy independence, depending on the system configuration.
Solar Energy in Numbers
Indicative figures for photovoltaic systems in Greece. Actual performance and savings depend on the specific installation, location, consumption profile, equipment and operating conditions.
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