Types of solar inverter

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August 8, 2023 at 6:03 pm

There are three main types of solar inverter – string inverters, microinverters and power optimisers:

1. String inverters:
String inverters are the oldest form of inverter, using a proven technology that has been in use for decades. Solar panels are arranged into groups or rows, with each panel installed on a ‘string’. Multiple strings can be connected to a single inverter, which transforms the DC electricity produced by the panels into appliance-friendly AC electricity.

The downside of string inverters is that if the performance of one panel is reduced – for example by damage or shading, the performance of the whole array can be affected.

2. Micro inverters:
Micro inverters are becoming a popular choice in residential solar systems. These are fitted to each individual solar panel and convert DC to AC on the roof, removing the necessity of a separate inverter.

Because the conversion is performed this way, if one or more panels are affected by shade then it doesn’t have an impact on the panels that are still in sunlight. It’s also possible to monitor performance levels of every single solar panel.

3. Power optimizers:
Offering many of the benefits of microinverters, but slightly less expensive, power optimisers are also located on each individual panel. But instead of converting DC to AC at roof level, they move the DC to a string inverter. With power optimisers, you should be able to monitor the performance of each panel via an online portal.