Hello all

 

My five year old diminutive Enpase system had its best day ever yesterday.

It produced 17 .4 KWh from a 2.75 KWp system.

The panels seem not to be degrading very much at all.

I was under the impresson max rate of degradation occurred when new and then slowly petered off.

Does this bears well for efficiency in the the longer term?

The panels are 275 watt solar world all black and I'm in Cheshire

Module degradation is a peculiar thing. It has been known for some modules to improve with time. I suspect that was misreporting though.

As for your best day every. That is probably a combination of irradiance, temperatures and time. Just a lucky combination on that day.

Panel degradation is an accountant thing - the only thing that stops a PV sell working is a hammer or a cosmic ray. Cosmic rays travel clean through the planet without hitting anything. 
 

I saw a PV panel from a North Seay buoy 30 years ago when it had been out at sea for 25 years, it measured efficiency was 98% 

 

please note it think that you might mean kWh not KWh