A solar PV System with an
How to turn your home into a green energy plant?
Potential customers often come to us with the question whether solar PV systems are a good investment for a household. Our experience shows that it is quite possible for an on-grid system on a rooftop or in a backyard to become a profitable investment. The benefits of this type of investment are numerous – it increases the value of the property, it is aesthetically pleasing, and it brings additional income for the househol. All this with a minimal need for maintenance.
A perfect example for this is an on-grid solar PV system for investment purposes, which we designed and installed on the roof and in the backyard of a house in the town of Troyan. The entire amount of electricity produced by the plant is intended for sale to the local electricity distribution company (CEZ) at the preferential tariff set for this purpose.
Solar PV system components
The system consists of 96 pcs monocrystalline solar PV panels SunRise 310Wp Mono PERC and 1 pcs Huawei SUN2000-33KTL on-grid inverter. Monocrystalline panels are preferred over polycrystalline, especially for small installations, due to their higher efficiency. In this case, an efficiency of 18.78% allows the deployment of more power on a relatively smaller area. With the SunRise panels we chose for this installation, we were able to place 30kWp on a total area of about 350m2. Although the construction of the plant entirely on land is not legally excluded, here we had to comply with a requirement of CEZ (the regional power distribution company), ie. part of the panels had to be located on the roof of one of the buildings on the property. For this reason, the panels were distributed between the roof of a garage (16 pcs., 27m2) and the backyard (80 pcs., 300m2).
Legal framework and legalisation process
Understandably, our potential clients are wary of the bureaucratic process of legalising such an investment. We assure them that we have gone through this process hundreds of times and we are fully prepared to bear the burden by preparing all the necessary documents on their behalf, including a technical design project – part structural and part electrical. In this way, we are sure that the procedure will be passed in the most effective way for all parties.
The legal framework allows the investment in a solar PV plant to be made both on behalf of a company and on behalf of an individual. To invest, households do not need to start a business. According to Art. 24, item 1 of the Renewable Energy Sources Act (ZEVI), the requirement is that the property on which the installation is planned needs to be in an urbanised area and needs to have a building connected to the electricity distribution network (as a consumer) within its boundaries.
In the town of Troyan we built a 30kWp on-grid system, ground-mounted, but not just on any land. This site was one of the greatest challenges we have faced. The terrain on which the solar PV panels had to be placed has a lateral slope of about 35-40 °. Together with our partners specializing in mounting structures, we installed a compacted structure with two legs in a row. Unfortunately, the trees you see in the photos in front of the first string of panels had to be removed so that there would be no shading of the system and that the system is producng at its maximim capacity. Although the installation of the panels on this site was not at all easy, the installation of the 30kWp system was completed in 5 days. Our standard lead times for a 30kWp are 1 week.
Income and return on investment
We anticipate that this system will produce 38MWh per year. Thanks to a purchase agreement concluded with CEZ, at a tariff of BGN 198.27 per megawatt hour, the system will bring annual revenues of about BGN 7,500 to the household. According to the current conditions for purchasing energy from solar PV power plants up to 30kWp, the tariff is valid until reaching 1348 hours of total annual system operation time (in this case 30kWp x 1348 hours = 40.44MWh) and until 31.12.2035. After the end of this period, the electricity produced by the system will need to be traded on the energy market.
The initial investment in a 30kWp solar PV plant varies according to the location of the property and the conditions for installation of the system, but the average payback period is between 5 and 7 years. Commercial banks have already seen evidence of the security of this investment and in the last few years have been offering loans on good terms on the basis of a purchase agreement with the electricity distribution company. This makes it even easier for households that want to make an investment that brings them additional income with minimal effort and maintenance costs.
The only costs that households need to consider when planning finances are fees and taxes on additional income. The system does not require any technical maintenance, except for regular cleaning of the panels to ensure their maximum possible efficiency.
Investing in solar PV energy systems is attractive, but we realize that it can seem like a big challenge to households. So far, we have helped hundreds of our customers go through the process and become energy producers, who are now receiving monthly income from their investments.
If you are interested, we can answer all your technical and financial questions and assist you with any necessary steps.
Contact us today to find out how you can turn your home into a green energy plant!