Solar Output in this heat

[marshman]

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[nowty]

As a recap, here on in a cooler spring day with 12kWp of panels, we can get to the inverter power cap of 9kW.
Saturday at 25 degrees it was down to 7.5kW.
Monday at 30 degrees it was down to 7kW.
And today (Tues) at 33 degrees it is down to 6.8kW.

[spread-tee]

That increase will be short lived - I did this years ago on my 3.15kW system and concluded that whilst it was interesting and fun, it was a lot of effort and a waste of water. What made a bigger difference was ducting cool air under the panels, but again although interesting I couldn't be bothered to implement a permanent installation and the wind soon destroyed my experimental cardboard ducting

My 3.15kW pk system on a cool sunny day in May will happily sit at 2800 W output for several hours around mid day (I discount peaks as skys clear after a cloud passes - the inverter maxes out at 3050W - it is an SMA SB3000) but on hot June/July days (same period after June 21st) it will drop to around 2350W (which it is at the moment) so a drop of around 15%. I would say the "average" for the summer period is around 2600W mid day generation with an ambient in the low to mid 20 deg C so temperature gives a +/- 10% variation on that figure. The system is now over 12 years old and the panel output shows no sign of any reduction.

Absolutely, within 15 minutes the output had fallen back to about 390W, as you say interesting but not worth doing anything.

Desp

[Mr Gus]

It was MM's water experiment & ducting for air a few years back that made me want to get as much air to the underside of a residential application as possible (the rest is what insurance is for), thus workable room beneath & in essence a roof of solar with a bit old metal can (140 watts & 20 inch Alan that we've been using for years inside for summer cooling) to best effect, concrete slab shaded, high roof cooler internally as no underside heat trap, & using a big fan as before pointed upwards for maximum all over breeze effect of course nowadays you can fit, (though a sparky would rightfully scream at you) Ali express micro pipe water misters ...what could go wrong eh!?

Nb, I don't recommend anyone fits a circular mount spray mister to a 220/240v fan no matter what, ..they sell anything in China after all.

(Maybe a Dyson fan type would work on the mister principal better than an old fashioned fan for limiting electrocution potential if you really must bodgineer, due to better separation of components)