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.


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?


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.

For more tips from John Conlin visit the
Chartered Surveyor Q&A section

The opinions expressed are those of the author and are not held by Saga unless specifically stated.

The material is for general information only and does not constitute investment, tax, legal, medical or other form of advice. You should not rely on this information to make (or refrain from making) any decisions. Always obtain independent, professional advice for your own particular situation.