DIY PHOTOVOLTAIC SYSTEM
DIY photovoltaic system or professional assistance? What are the advantages and disadvantages and what alternative to choose?
What components are needed and what are the prices?
The installation of a DIY photovoltaic system is recommended only for small solutions, with limited electricity production. It is an appropriate option for those who already have some basic knowledge in this field. Next we see the prices of the individual components together.
However, you must also add the shipping costs, design and installation of the DIY photovoltaic system, which is around 1000 – 2000 €. It is always better to provide insurance, which instead is around € 200 per year.
|panels||€ 3000 for 3 kWh (€ 1000 per extra kWh)|
|Accumulation batteries||500 – 1000 €|
|Charge regulator||150 – 200 €|
|Photovoltaic inverter||400 – 500 €|
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Do you want to know how much you can save with your photovoltaic system and the cost per kWh?
Step 1: identify the necessary elements.
To realize a complete and safe photovoltaic system, as indicated in the table, it is necessary:
- solar panels;
- Charge regulator;
Photovoltaic panels produce electricity using that produced by the sun, only when the surface is reached by lightning, so during the day. To ensure that energy that is not used immediately is not lost, it is stored in batteries, with a regulator that allows the interruption of energy storage, once they have reached maximum capacity.
Finally, the current, to enter the circuit of the house and be used, must be transformed from continuous to alternating, through the inverter.
Phase 2: dimensioning of the photovoltaic system.
When designing a domestic photovoltaic system, it is necessary to choose the appropriate size, which is the consumption to cover, calculated from the electricity bill. It must be at least equal to the light requirement of your family, usually around 3 kWh per year. From this, the number of panels to be installed and the power of the inverter are established, which must always be proportional to the energy consumed.
This is an important design phase, which allows to maximize the economic advantage of the plant, always considering the maximum consumption. In this way, you will not find yourself investing in a plant that is too large, which will do less than you expected. In case of doubt, always have the experience of professionals.
Step 3: installation
The panels can also be purchased online. There are many cheap photovoltaic kits that are sent directly to your home.
Once delivered, you must continue with the connection that must be made by trusted professionals.
They consist of a positive pole and a negative pole, thus producing a direct current voltage. To have greater electricity production, they must be connected through specific cables.
These must be chosen appropriately according to the maximum power supplied by the panels. To increase the efficiency of the photovoltaic system, you must pass the appropriate amount of electrical power, without the outer part of the cable overheating.
Connection between two panels.
The connection between two panels, which can be in series (identical and posterior) or in parallel (inverted), occurs through the placement of a block or bypass diode. In this phase it is also necessary to reduce the effect of the photovoltaic HotSpot, due to the shading that causes a decrease in the potential of the panels.
Finally, consider that only if the panels have the same voltage can a parallel connection be made, regardless of its power
Bureaucracy: let’s be clear
The necessary municipal permits vary from one case to another:
- Mobile panels do not need them;
- Those that are fixed on the roof of the house, that do not change the form, the installation must be communicated to the municipality;
- the plants built in condominium, but at the service of individual, non-centralized users, only need the green light of the condominiums;
The connection of the system to the network is not mandatory, but if the panels are not installed, however, they will not be able to supply the residual energy produced in the network. Distribution company (not supplier), for this reason the procedure is regulated by the Electricity and Gas Authority (AEEG). If the plant has more than 1,000 kWh, it will take a maximum of 60 working days for the estimate to be accepted and 30 to 90 days for the actual works.
The connection is not mandatory, you can still use your panels to produce energy and accumulate it in the batteries and consume it on site.
Choose DIY or contact professionals?
Taking into account all the general costs, the price of a DIY system does not differ much from that proposed by professional companies. The real difference is that with the latter it is possible to individually choose each piece that will be part of the plant. Therefore, it is recommended especially for those with a great knowledge of the field. In this case, it can be difficult to find elements that are compatible with each other and can be easily connected.
If you wish to avoid dealing with each phase individually, including bureaucracy, contact professional companies that will provide you with a complete service: from installation to testing.
In this way, you can also count on your experience in the field and make sure you have the best photovoltaic system for your needs.