The ratio between the yield of the photovoltaic and the available surface

The sizing of the area available to install the photovoltaic panels according to the power is very critical. Let's see how many square meters it would take for a power of 1 kWp (Kilowatt peak) by using the formula.

With Monocrystalline panels, about 6.25 m² are needed. With Polycrystalline panels, 6.25 m² are required, 25 m² with amorphous Silicon panels with an efficiency of 4%, 11 m² with Amorphous Silicon panels with micro granules with an efficiency of 9%, 8.3 m² with panels in amorphous silicon with CIGS alloys yield 12%.

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Method to be used when connecting the controller to the photovoltaic system

 Notes: When disconnecting the system, do the reverse procedure

The surfaces are relatively secondary if you choose high-performance photovoltaic panels such as Sunpower panels. Their performance is surprising, but the cost is high compared to other panels, anyway, it is an excellent investment for the future. The best company which produces good photovoltaic panel are:

• Sun power
• HIT Panasonic (Sanyo)
• Kyocera

For example: To reach the fateful threshold of 3 kWp with SunPower, about 17-18 square meters are enough, with the others even 25 square meters (depending on the brand).

However, the Sun power is probably the most expensive with Sanyo (now purchased by Panasonic). We can easily expect an approximate price between 1.1 and 1.2 euros per watt in Europe. On the US sites, you can see the costs of the modules. The 333-watt E20 model is about 300 dollars.

We always recommend price and quality; It makes no sense to buy solar panels if they begin to decline in performance after five years.