The best grid tie inverters match the (pure sine) waveform of the grid's AC voltage, and ensure that they do not overload the grid with excess power – which can be especially problematic with solar panel systems during peak sunlight hours.
For a 3kW solar panel system, a 3kW or 3. A 5kW inverter works only if you plan to expand later, while a 2kW inverter will bottleneck your system and waste energy.
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When the inverter is unloaded -- that is, when no devices or appliances are drawing power from it -- it still draws some power from the DC source it's connected to. This is often referred to as "no-load power" or "idle power".
In 1991, mass production of PV solar inverters began with the introduction of the SunPower SMA WR 1800. The Sunny Boy 700 was introduced five years later in 1995.