Residential PV Systems

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Become an electric current producer !

The PV Roof Systems’ market, is a dynamically developing market, especially in Greece as well as abroad. The complete PV series ExelSolar, is a special proposal drawn for grid-connected and stand-alone systems, both for flat and sloped roofs.

ExelGroup can provide you complete solution for your installation. This means that apart from the equipment (PV panels, mounting structures, inverters) you can choose the installer through the exelGroup's network of authorized partners.

Hot spots

The production of electric energy from the sun is exceptionally foreseeable. What is interesting, is how many kilowatt-hours, will our PV system produce, annually. In general terms, a PV system in Greece produces on average around 1.400 kilowatt-hours per installed kilowatt, annually.

The sun provides more than 1000 Watt/hour/square metre. The solar energy that reaches the earth in 1 hour covers the energy needs of the planet for the whole year!

The output for the photovoltaic modules, reaches today the 5-15% , depending on the type of crystal that is used. This means practically that 1000 Watt of solar energy are converted in 50-150 Watt of electric energy per hour in each sq.m. of photovoltaic modules.

Types of Installation

There are two types of installation for the PV Systems:

Grid connected or stand-alone systems.

Διασυνδεδεμένο Σύστημα

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Photovoltaics-Timeline

Watch a video
from the PV Panels production line

Suitability: Is my building, suitable for a PV installation?κά;

Most buildings are suitable for PV installations, under specific conditions.

Existing sufficient free and unshaded space. The optimum condition is a 100% unshaded space, during whole day. Under different conditions, the system will have less output.

PV systems have the highest output, when they have southern orientation. Angle declinations up to 45o from South, are permissible but decrease the output.

Solar Home Energy

The correct inclination for the PV system, concerning the horizontal level, is an important factor. Usually PV installers, select an inclination, that would offer the best medium results during the whole year. In Greece, the optimal inclination is around 30o, because of the geographic position.

Building Orientation	Surface Slope
Building Orientation	0^o	30^o	90^o
Eastern - Western	90	85	50
Southeastern- Southwestern	90	95	60
Southern	90	100	60
Northeastern- Northwestern	90	67	30
Northern	90	60	20

Roof ready for installation

Generally , a n unshaded space is required. For the maximum output, the PV modules should be installed with direction to the South, and with an angle of 30o. The surface that is required for each installed kW is nearly 12-15sq.m. for a flat-roof or 7-10 sq.m. for a sloped roof. Other ways your photovoltaic system will have decreased output but this doesn’t mean that the investment is not viable.

The medium surface for 1kW of installed photovoltaic modules, is about 8 sq.m. . On an inclining roof the photovoltaic system should be installed with a direction to the South. Finally, it is advised the angle of the roof to be from almost 28 degrees to no bigger than 33 degrees.

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