Any energy system that works in sync with the power grid is called an On-grid.

What are the advantages of photovoltaic systems connected to the grid?

Network solar systems (On-grid PV Systems) are the most common and cost-effective option for a photovoltaic system suitable for both household and industry.

  • ELECTRICITY BILLS REDUCTION
  • RELIABILITY OF THE GRID, COMBINED WITH GREEN ENERGY
  • LONG-TERM INVESTMENT WITH FAST RETURN

The preferential prices for the purchase of the electricity produced by photovoltaic systems, make them an investment tool and, accordingly, the most common type of photovoltaic systems for electricity production not only in the country but also all over the world.

On-grid systems for industry, business and households with different capacities

On-grid solar power systems are suitable for households, industrial production, agricultural sites, business buildings and warehouses. The energy produced by them can be used both for self-consuption and for the sale of electricity to the local ERP or on the free market.

  • 5 kW – 5 kW grid-connected solar installation for electricity is an ideal investment for households, office buildings or various businesses, whose main electricity consumption is during the light part of the day. Such a solar system could meet the needs of office space with 5-10 jobs.
  • 30 kW – On-grid photovoltaic system with a capacity of 30 kW, can be installed on the roofs of warehouses, hotels, manufacturing plants or sheds. Such a installation can be used both for self-consuption and for the sale of electricity, and a combination of both is possible.
  • Overd 30 kW – A photovoltaic plant with a capacity over 30 kW could be integrated on roofs and facades of buildings or installed in suitable vacant areas, and the energy produced can reduce electricity bills through direct consumption, or serve as an investment tool through sales of the generated electricity.

Residential buildings, houses, sheds, service buildings, halls, warehouses are especially suitable for installation of solar panels for electricity production. Photovoltaic panels can be installed on buildings with sloping roofs, flat roof buildings and on the ground.

What does a On-grid solar system contain?

The elements of the network solar system are solar modules, network inverters, switchboards and a communication and monitoring system, which is optional.

Solar panels

Photovoltaic power panels are a semiconductor device that converts solar light energy into direct current electricity.

Grid-connected inverters

Since solar panels generate direct current, an inverter is needed that convert the constant voltage of 12V, 24V or 48V into alternating 230V.

Monitoring system

The network solar system can be monitored in real time or record performance data using intelligent devices called data loggers.

Equipment for 30 kW

You can find a price for a 30 kW grid connected solar system HERE. If you want to receive a price for installation on a specific site, please contact us via the contact form, at 0879 / 82-91-11 | 0879 / 82-91-14 or via email: office@3k-solar.bg

What is an On-grid solar system?

Grid-connected photovoltaic plants can be built to sell the generated green electricity, but a grid system could also be used for direct consumption and sale of only the excess generation. Grid-connected solar systems reduce the electricity bills of businesses, companies, houses, villas, hotels and even residential buildings.

The name of the On-grid solar systems comes from their method of operation, namely – these photovoltaic installations work in sync with the electrical network.

This type of solar power systems does not contain a battery pack, and its power can vary from 1kW, 3kW, 5kW, 10kW, 15kW, 30kW to systems with a size of 1MW megawatts and up. The power of such a system depends mainly on the amount of investment you are willing to make and the size of the areas provided for installation of the photovoltaic plant.

Grid-connected solar systems make it possible to use both the solar energy generated by the photovoltaic installation and the electricity supplied by the grid. These systems combine renewable electricity with the reliability of the electricity grid. They do not need the generated energy to fully cover the consumption of the household, villa or business.

The electricity produced by a photovoltaic system is consumed in real time, and the excess energy that in the off-grid and the hybrid system is accumulated in batteries, in the on-grid one is given to the grid and can be purchased from the local energy distribution company. Since the battery pack is between 20% and 50% of the investment for an autonomous or hybrid system, the grid system is the solar installation with the least investment and the fastest return.

Then, when the electricity produced by the on-grid solar system does not cover the electricity needs of the home or business (for example, during the dark part of the day or in bad weather conditions), the shortage is covered by electricity from the grid.

The installation of a photovoltaic grid-connected system allows the owner to sell the energy produced by him in whole or in part, as the state electricity distribution companies buy energy produced from renewable energy sources at preferential prices set by the Energy and Water Regulatory Commission (EWRC).

Working principle:

Grid-connected solar systems are photovoltaic generators that are directly connected to the electricity grid. The DC power generated by the photovoltaic modules is converted into an AC power by the on-grid inverters, after which it is transmitted to the grid.

The main difference between on and off systems is the lack of a battery pack in the grid-connected one, and the specific operation of the grid inverter.

This type of solar system could NOT work without the presence of alternating voltage at its output, and its methods of operation are basically two:

  • The entire amount of electricity produced should be delivered to the grid and sold accordingly;
    • When the system is designed entirely for the sale of the generated power, the photovoltaic generator is connected to the electricity grid directly, through an energy meter.
  • The generated energy is used for own consumption;
    • A photovoltaic grid-connected system designed for own consumption is connected to the internal network of the site. When electricity is generated, it enters the system and becomes a priority source of power for instant consumption. In case of shortage of production, the needs of the site are amplified by the main grid. In case of a larger amount of generated energy, you have two options again:
      • Sending to the grid and selling the excess amount of generated electricity, using a two-way electricity meter installed by the local Power distribution company;
      • The second option is to install a smart electricity meter that detects overproduction and limits it, thus the system owners do not have a relationship with the distribution company.

The On-grid photovoltaic system ALWAYS works ONLY in synchrony with the power grid. The existing European safety directive imposes restrictions on the operation of grid-connected solar systems in the event of a power failure, in order to limit the supply of voltage during repairs. Because of that, when designing On-grid systems, it is required to use the appropriate equipment, namely a converter unit that cannot operate in island mode.

If you want an offer designed to your requirements and energy needs, do not hesitate to contact us.