Filkab Solar: What are the differences and advantages of grid-connected, stand-alone or hybrid inverters?

When discussing solar-power systems, the conversation almost always loops back to magnets, percentages, and warranty periods. There is, however, a different important issue needing to be discussed: what do you want the system to do in the days where everything is going according to plan, and what to do during the days, when something goes wrong. Grid-connected, autonomous and hybrid inverters offer different behavior logics and most often it is the choice between them that determines whether the installation will be cheap and simple, difficult to replace and protected, or flexible and suitable for future upgrades. "The inverter sets the framework of how a system functions during its entire life cycle," Filkab Solar, a leading European company with many years of experience in the design and operation of solar-power systems, informed BalkanEngineer.com.

Grid inverters are designed to work in unison with the public grid. They convert DC from the panels into AC, synchronize frequency and phase, and feed the output into the grid or to local consumption when needed. This is the most common and simplified architectural solution for uses with access to stable grids and without autonomy needs.

Autonomous inverters operate outside the context of the grid. They form their own local grid conditions – they control batteries, generators and overloading, maintaining energy supply independent of a outside infrastructure. This class of devices often includes a broader set of protection and control functions for load management and fault recovery.

Hybrid inverters comprise the characteristics of both “worlds”. They operate on a network basis, when the network is available, and automatically switch to autonomous mode when it is unavailable. At the same time, they control batteries and can optimize the share of energy depending on the set strategies - only for own consumption, savings on an expensive tariff, or participation on site in energy services.

Photo source: Filkab Solar, ©Engineer.BG via Canva.com