December 21, 2018

The reduction in the selling price for interconnected photovoltaic systems has turned consumer interest in stand-alone systems.

But what are the differences between the two?

The photovoltaic market in Greece has been irreparably affected by the latest state-of-the-art choices, which has put investors in the spotlight on Renewable Energy Sources and photovoltaic systems in particular.

The May changes in the Home Photovoltaic program led to the “freezing” of photovoltaic systems and the most attractive investment opportunity in the photovoltaic sector seems to be the autonomous photovoltaic installations.

In this context, it is a good idea to know all the details about such an installation, as well as all its differences, in relation to an installation of the same investment of the most common in our country interconnected photovoltaic systems.

Below we will present an Interconnected and an Autonomous Photovoltaic Installation, based on their cost, profits and returns.

INTERCONNECTED INSTALLATION OF 10kWp IN THE ROOF

The system features • Panels: Aleo, Type: S18-250, nominal power 250 W, manufactured in Germany. • Inverter: Kostal, Type: Piko 10.1, rated power 10,100 W, German construction. • Aluminum bases: made of aluminum, specially made of aluminum, Eurocode design. • Location: Athens Cost and performance The final cost of an installed such system with these materials costs approximately € 16,500 (including VAT 23% and € 1,000 cost of PPC connection). The annual return on investment in the 25-year period averages € 1,569 per year, while the cost of the investment is amortized in about 10 years.

AUTONOMOUS INSTALLATION OF 3kWp IN THE ROOF

With the same capital of 16,500 euros we can finance an Autonomous Photovoltaic Plant with the following characteristics: Data

• Panels: Aleo, Type: S18-250, nominal power 250 W, manufactured in Germany.
• Network inverters: 1 SMA, Type: Sunny Boy 4000TL, nominal power 4,000 W, German. • Accumulators: 12 pcs of batteries, closed type VRLA, operating voltage 12V, capacity 200Ah, Greek construction.
• Autonomous network manager: 1 part inverter – SMA network administrator, Sunny Island 6.0H
• Aluminum bases: Made in Greece by special aluminum alloy, Eurocode design.
• Location: Chania

Cost and performance

The final cost of an installed such system with these materials costs about € 16,500 (including VAT 23%). With the current cost of purchasing the kilowatt-hour at 0.17 euros (including all consumer-dependent charges on PPC’s and VAT), the annual savings are € 1,360 per year, while the cost of depreciation investment is completed in 12 to 13 years, without calculating the savings from any avoidance of the charges we pay to the PPC accounts.