Accumulation of energy
The main question when planning the installation of a photovoltaic power plant in the house is: what will we do with surplus energy? Is it worth accumulating this electricity, sending it to heating, or selling it back to the grid?
Storing energy in batteries
Surpluses from PV production are thus transferred to energy storage. You can then use it at night, when energy is not produced, or, for example, during a power outage. A typical situation occurs when a person is at work or anywhere else during the summer and comes home only in the evening.
He turns on the washing machine, the dishwasher, the TV, and cooks, all thanks to the battery. If he didn’t have it, he would have to draw electricity for all these appliances and electronic joys from the grid. At once, the savings will be very small and the payback is prolonged.
In addition, the size of the subsidy increases when purchasing a PV system with a battery.
Returning energy back to the grid
Another possibility is to sell surpluses to one of the companies that buys this energy, and then you can take it back at a discounted price.
If you do not use all the energy produced by your PV plant, you can store the excess in a virtual battery in the grid and take it back at any time. When you collect your energy, you have a 100% discount on the power part of the electricity, but you also pay for the distribution costs, circuit breaker, monthly operation fee, taxes and more.
Saving energy for heating water
Photovoltaics with water storage is a simpler and cheaper solution than batteries. You can use excess energy to heat water in a boiler or swimming pool.
Thanks to more advanced technologies and cheaper production of photovoltaic cells, it is worthwhile to purchase a PV system with storage. The least advantageous option seems to be PV without storage, when you cannot sell, but return energy to the grid for free.
If you want to find out whether any of the above-described accumulation methods are beneficial for you, take advantage of free individual consultations with LOSKY specialists.
LOSKY has been engaged in the construction of solar panels since 2006, and from spring 2021 it is part of the industry association AKU-BAT, which brings together leading Czech experts in electric energy storage.