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On-Grid Systems

The most common system, with the lowest cost and least maintenance.

Main characteristics

The name of the system itself comes from its way of working, namely – in parallel with the network. It consists of photovoltaic panels, grid inverter (one or several) and distribution board. It has no batteries. The power of these systems can vary from 250Wp to infinity, depending on the needs.

The size of such a system is mainly determined by two factors – the area you have available to install the photovoltaic system and amount of the investment you are ready to make.

It is important that the location of your building is such that you have a south exposure, and that you do not have anything around you that could overshadow you at any given time – trees, buildings, etc.

First option

These systems can work on two principles – entirely for sale of the produced electricity or for own consumption.

In the first option, the photovoltaic system is connected directly to the power grid by means of an electricity meter and the entire amount produced is given outside. At the end of each month, it is calculated and, after issuing a payment document, you are paid at the price specified in your purchase contract. At the moment, the most widespread photovoltaic system 30kW, because up to this power you are guaranteed to buy the energy at a preferential price determined by KEVR.

At the moment there are three requirements for the property, in that you want to build a photovoltaic system in order to sell the energy:

  • The property must be regulated by the settlement
  • The property must have a massive building built and reflected in the sketch
  • The building must be connected to the ERP, that is, you must have electricity in the property

Price for purchasing energy from photovoltaic power plants as of 07/01/2020. with decision C-27 of KEVR:

  • FTPP with an installed capacity of up to 5 kWp, installed on roofs and facades - BGN 208.80 per megawatt hour without VAT.
  • FTPP with an installed capacity of up to 5 kWp, installed on roofs and facades - BGN 208.80 per megawatt hour without VAT.

  • The average annual duration of operation of the plant is organized up to 1,406 hours, which is equal to 1,406 kWh/kWp net specific production.

Second option

In the second option, the photovoltaic system is connected to the internal network of your household. If there is production from the plant, the produced energy enters the system of your household. If at this moment you have consumption, it is satisfied as a priority by the photovoltaic system. If, however, the production of the system fails to satisfy the needs of the household at that moment, the amount of energy that does not reach is supplemented by the external network.

Understandably, the bureaucratic process of legalizing such an investment can worry any potential investor. We assure you that we have been through this process hundreds of times and we are fully prepared to take on the burden by preparing all the necessary documents, including a project – part structural and part electrical.

All steps, along with requirements and necessary documents, are presented on this infographic. For further questions, you can read more on our FAQ page.

On the other hand, if the amount of energy produced is greater than what you are currently consuming, then you have two options:

Option 1

The excess amount is given back to the network, by means of a two-way electricity meter, which is installed by the energy transmission company and this energy is paid to you at a certain price, which is different from the preferential price indicated above.< /p>

Option 2

Limiting production, by means of a smart electricity meter that detects when there is excess energy. In this way, you will have no relationship with the ERP. With this option, it is good to calculate well, that the surplus should not be more than 15% of the working time, because then the losses will be unreasonably large and it is good to think about one of the other two options.

For Bulgaria, the average working hours of a photovoltaic system on an annual basis are about 1300 hours. Which means that if, for example, you have a photovoltaic system of 5kWp, then 5 x 1300 = 6500 kW of energy output you can expect on an annual basis. You should take into account that in summer the production of a system is about 3 times more than in winter.

With us you get

Expert consultation

We will try to answer every question you have. If we happen to not know the answer to any of them, we will find it as quickly as possible.

Certified products

All the materials and components we use meet the highest global standards for quality and safety. Every single product is suitable for use on the territory of the EU.

Documentation

We will explain everything about the necessary documents, How to get them, where and when to submit them. We will help you fill in every single form.

Just in time

We do our work, exactly within the deadlines we have given. They will be described in our contract and will be a priority for us.

Standards

Absolutely every single product we work with comes with a guarantee. Whatever happens to it, in that time frame, will be repaired or replaced as soon as possible.

High quality

High quality is our highest priority. We always strive for it, at any cost.