In 2012, I had a reputable installer fit solar panels to my house.
If has reduced my electricity bills somewhat –currently the savings are a bit over $200 per year (admittedly in a small household which doesn’t use a lot of electricity).
Last year the inverter failed and it cost around $1,100 to replace. I could easily have spent a lot more on the inverter itself if I’d taken up the tradie offer of ‘This particular model comes with a 10 year guarantee but it’ll cost you $4,000’ – ‘uh, no, thanks.’
When I identified the problem initially, the first solar electrician I called asked, ‘so let me guess – you’ve had the system about seven years?’ It seems like inverters have a shelf life and that cost needs to be factored into the longer term calculations for the system.
In other words, installing a solar system might not save you as much as the initial projections indicate.