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What is an inverter?
An inverter converts direct current into alternating current at the voltage and frequency the grid or the load requires. In solar it turns panel DC into usable AC. In a battery system a bidirectional inverter also runs in reverse, taking AC from the grid to charge the battery, which is what makes storage and backup possible.
The inverter is where most of the intelligence in a modern energy system lives. It sets what the system can do, not just how much power it can move.
The four types you will meet
Grid tied inverters export solar to the grid and shut down when the grid is absent, so they give no backup. Off grid inverters form their own AC network from a battery. Hybrid inverters do both, managing solar, battery, and grid together. Bidirectional inverters, usually called a power conversion system in storage projects, charge and discharge a battery under external control.
Ratings that actually matter
Continuous power in kW, not peak. Surge capability and duration, which decides whether motors and compressors will start. Efficiency across the load range, since most systems run at part load. MPPT count and voltage window on solar inputs. And the transfer time in backup mode, which determines whether sensitive equipment rides through.
Grid code and compliance
Any inverter connected to the public network must satisfy the local grid code: anti islanding protection, voltage and frequency ride through, reactive power behaviour, and documented certification. In Kosova and Albania this documentation is part of the connection approval, so it belongs in the specification from day one, not after commissioning.
Frequently asked
- Will a grid tied solar inverter work during a blackout?
- No. Anti islanding protection shuts it down for the safety of line workers. Backup during an outage requires a hybrid inverter with a battery and a proper changeover arrangement.
- What size inverter do I need?
- Size it to the simultaneous load you must run, plus surge headroom for motors, not to the total connected load. Oversizing wastes efficiency at part load; undersizing trips on start up.
- How long do inverters last?
- Typically 10 to 15 years, shorter than the panels and often shorter than the battery. Plan for one inverter replacement inside the life of a photovoltaic plant, and keep ventilation clean.