camelot-forum.co.uk

My FIT system briefly showed 2498W today.
It’s the original 2.5kW Sunny Boy with 10 Sharp panels rated at a total of 2450kWp, installed 02/10/2011.
No loss of performance. I think that’s just brilliant.

Your experience is typical. While you cannot read too much from one instantaneous reading. And even Monthly or Annual totals are difficult to extrapolate (you can have a sunny April one year and a cloudy one the year after). However the consistent theme is that precisely zero deg is observable across a huge number of installs that have been in place for more than 10 years.

This is particularly interesting because these installations were originally accompanied with pretty charts telling consumers to expect the panels to degrade over time and output to reduce, but no such reduction is observable.

Briefly saw 5880W (107A!) from my "new" array earlier today. And by brief I mean for 3 minutes, not just cloud-edge cool-panel overpeak type production. Considering that its a hodgepodge of 8+ year old panels which would total 5940Wp as per the spec sheets, I'm pretty happy with that.

This is a big reason I risked going for the second hand panels at less than half the price of newer more efficient ones; my previous PV saw no degradation in 11 years on the roof either.