EcoSouth Solar Blog

Here is news and thoughts of the EcoSouth team regarding all things solar. No information contained here should be relied upon for its accuracy without independently verifying it.

  • Home
    Home This is where you can find all the blog posts throughout the site.
  • Categories
    Categories Displays a list of categories from this blog.
  • Tags
    Tags Displays a list of tags that have been used in the blog.
  • Bloggers
    Bloggers Search for your favorite blogger from this site.

What happens when your inverter gets old?

Posted by on in Solar Pitfalls
  • Font size: Larger Smaller
  • Hits: 3105
  • Print
  • Report this post

Ok, so if solar panels are supposed to last 25 to 30 years, how many years can you expect your solar inverter to last?

A very good question, with no clear-cut answer, I'm afraid.

After installing and servicing inverters for over 14 years, I can suggest some typical patterns of failure.

One: Sub-standard components or deficient programming. Either of these can result in accelerated wear/aging of one or more components, resulting in a failure pattern with consistent, recognisable symptoms (eg consistent error message). Typically this can be the mains connection relay which is used to make the connection and disconnection to your premises electrical system. It has a limited number of operation cycles, and faulty control or sub-standard capability means it will fail prematurely. Even 'premium brands' are not exempt from this sort of behaviour!

Two: Changing or extreme mains/grid conditions result in accelerated wear. Typically, we see inverter models that have been in service for a number of years, now start failing. It includes inverters installed very recently, as well those installed a few years previously. Most of these we can only guess that these have succumbed to some sort of mains electrical disturbance, eg surges, spikes, increased 'street voltage' etc. Some we can put down to things like increased wear of the relay because the higher mains voltage now causes the relay to switch off and on again more frequently during the day.

Three: Hitting the limits of the technolgy lifetime. Manufacturers would ideally like to install electrical components that last forever, but instead settle with the best lifetime/economy ratio for that particular part. Eg, a transformer may last for a good many decades, but high-power capacitors are typically expected to last for only around 8 to 10 years. However, conservatively rated capacitors may well last longer. There are a myriad of other tricky little components that the design engineer must contend with in the process of design of the inverter.

Last modified on
Rate this blog entry:

Chris Hart has been employed in the field of IT majoring in hardware and power issues for over 20 years, followed by 15 years designing and supplying solar battery systems for domestic and commercial markets. He has qualifications in electronic engineering and management.


  • No comments made yet. Be the first to submit a comment

Leave your comment

Guest Thursday, 30 June 2022