Choosing between a string inverter and a microinverter depends on a variety of factors, including system size, budget, and performance needs. String inverters are generally more suitable for large solar installations where profitability is a key factor. They are less expensive to install and maintain than microinverters and are suitable for systems where shading is minimal and panel orientation is consistent. However, their performance may be affected if a channel panel is shadowed or malfunctioning.
Microinverters, on the other hand, offer panel-level optimization, which can lead to higher overall system efficiency, especially in situations where panel conditions or shading vary. Microinverters can offer better performance in these scenarios, but have a higher upfront cost.
String inverters are often chosen for their simplicity and cost effectiveness, especially in large solar installations. They are generally more affordable than microinverters and easier to install and maintain thanks to a single unit that handles the DC-AC conversion for all panels in the system.
String inverters are a good choice for systems with minimal shading and where the panels are oriented the same. Their cost effectiveness and simple design make them a popular choice for many residential and commercial solar installations.
Microinverters are chosen for their ability to optimize the performance of each individual solar panel. They are useful in systems where shading, panel orientation or mismatch can impact overall performance.
By converting direct current to alternating current at the panel level, microinverters ensure that the performance of one panel does not affect the others. This can lead to higher energy yield and efficiency, especially in conditions where shading or varying panel angles are factors. Additionally, microinverters provide detailed monitoring of each panel’s performance, which helps diagnose problems and optimize system output.
With microinverters you still need an inverter, but in this case each panel has its own microinverter that does the DC-AC conversion.
The term “inverter” in the context of microinverters refers to the fact that each microinverter handles the conversion for its respective panel. Therefore, even if the system includes several small inverters rather than one large one, the concept of inverting DC to AC still applies. The AC output of all microinverters is combined and fed into the home’s electrical system or grid.
Determining which inverter is better (string or micro) involves evaluating the specific needs of your solar power system.
String inverters are generally better for large installations with uniform panel conditions and where cost is an important factor. They are simpler and more cost effective, but may be less effective in situations with shading or panel orientation issues. Microinverters are best suited for systems with potential shading, varied panel orientations, or where panel performance needs to be optimized individually. They offer improved performance and security benefits, but come with higher costs.
The best choice depends on factors such as system size, budget, installation conditions and performance requirements.