Is it worth replacing my solar panel inverters?

John Conlin / 12 June 2018

A reader is unsure whether replacing his solar panel inverters is a good idea or not.



Question

I have six eight-year-old solar panels feeding two 600 watt inverters. Although it is working I have been advised to replace the inverters as they are nearing the end of their normal life and output will drop. Is this good advice?

Answer

As the volume of new panel installations reduces the various firms are turning their attention to replacement and upgrading. What is generally not stated is that the output from a solar panel declines over 25 years and is rapid over the first 10 years and the inverter is often, wrongly, blamed. I, personally, would not replace an inverter without first checking the panel inputs with the inverter output to assess whether the actual loss in the inverter is significantly high or in line with the reduced panel input.

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