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Network solar station for partial replacement of electricity consumption

Why is this needed?

According to the forecast of the Ministry of Economic Development and Trade (MEDT), the cost of electrical energy for non-domestic consumers will increase annually: +15% in 2020, another +12.5% should be expected in 2021. Reducing operating costs and increasing profitability The use of a network solar power plant for your own needs will reduce electricity costs by a total of 30-50% per year. Including in the spring-summer period up to 90%, in the autumn-winter period - about 10-20%, depending on the nature of consumption. The amount saved by powering the sun's "own" energy will increase every year, in line with the rising cost of electricity.  

When is this needed?

  • When the site has high power consumption during the day.
  • When it is not possible or advisable to connect to the "Green Tariff".
  • When the registration of the “Green Tariff” is in process, and the benefits of using solar energy need to be taken advantage of today.
Reduce energy costs by 30-50% per year

Who is this suitable for?

  • For large, small and medium-sized businesses.
Which is not profitable to connect the Green tariff for legal entities. For example, solar power plants are not very powerful on the roofs of administrative and commercial buildings. The cost of connecting to external networks is high and constitutes a significant share of the total cost of the project, and sometimes can even exceed the price of equipment and construction work! Or for those who do not want to waste time on completing the documents necessary to connect an electrical station, who need to use solar energy immediately after the construction of a solar power plant.
  • For individuals.
For those who cannot quickly connect to the Green Tariff and do not have their own agreement with Oblenergo, electricity is supplied from dacha or cottage cooperatives, railway networks, or any other legal or individual person. For those who have difficulties with increasing power under a contract or applying for a Green Tariff and want to use solar energy right away.
  • For government and budget institutions.
Those who cannot engage in commercial activities by law, namely, sell electrical energy, as the concept of the Green Tariff implies.

How does it work?

The principle of operation of a solar station operating for its own needs is almost no different from a solar power plant designed to sell electricity. Still, photovoltaic modules convert light energy into direct electric current, and a network inverter converts direct current into alternating current and “feeds” the network. With only one exception - an object operating under the Green Tariff creates a flow of energy into the external network, but in this case this flow is blocked. The point is the principle of selling generated energy under the Green Tariff. It is the flow into the external network that is paid for, which occurs after the loads on the power line, if any, are fully supplied with energy. And this energy is taken into account by a special bidirectional counter. In this case, at facilities without a Green Tariff, it is not yet possible by law to install a bidirectional meter and energy flows threaten the owner with a fine, to avoid which it is necessary to monitor their absence. The most economically feasible way to get out of this situation is to dynamically regulate the power of a solar installation, implementing the zero-feed-in, zero export function, that is, zero return to the network. The idea is to install a special device that constantly monitors the load and flows in the network and dynamically regulates the power of the installation, such as the Smart Meter from Fronius and working in conjunction with inverters from this manufacturer. As a result, no more energy is generated than is needed to power the loads and there is no “flow” into the external network.
  Graph of the energy balance of an enterprise with an operating solar power plant.
  • Power to the network (green zone) is the “flow” of energy into the external network. Yes with OST, must be blocked if it is absent.
  • Directly consumed (gray area) - energy from the sun absorbed by loads. The one that was used for the facility’s own needs is “overridden” SES consumption. You can see from the areas of the figures that more than 50% of the object’s consumption has been covered.
  • Consumption (unshaded area) - object consumption “not covered” by the solar station, created by production and household loads.
20.11.2019