spring versus summer system results

[Simpsod1]

We've seen this effect consistently across loads of site that we monitor were the peak output and power days are actually the spring and autumn equinox and they beat midsummer.

Measured the temperature on our panels yesterday as equally saw a drop in output at around 1:30pm, panel temperatures 52.8°C.

Just measured them 2 minutes ago today.. Outside Air Temperature is 23.3°C Black on Black Mono: 46.8°C Silver on White Mono :43.2°C Surface our of decking area outside the office (great for iced tea on days like this ) 38.6°C power output is down by about 20% from cooler days.

Inverters are in ideal location, outside not in direct sun, plenty of ventilaltion.

Thanks for this, can you monitor panel temp with power one inverters, if so how?

 

[Worcester]

No these are thermometers speicifically designed for data capture and ultimately home automation - part of our comprehesive logging system (17 sensors and growing - openenergymonitor.org)

 

[Vegelen]

The changing angle of incidence between the suns rays and the solar panel is important.
If the angle of incidence between the sun's rays and the solar panel isnt optimum, it wont generate well regardless of light intensity, temperature, length of day etc.
Direct light contributes more to generation than diffuse light.
Modal peak solar generation tends to peak within an hour of midday in N West England,
when the sun is highest in the sky. In spring the UK sun tracks lower with a shorter orbital track. 30 Degree south facing roofs generate well at this time of year because the angle of incidence between the suns rays and the solar panel is closer to its optimum 90 degree angle. Seasonal wind and rain also help cool the panels.
In summer the sun tracks higher in the sky on a longer orbital track.
The angle of incidence between the suns direct light and the solar panel reduces at this time of year, average temperatures increase, weather tends to be more stable, less windy.
Fixed inclined 30 degree south facing solar systems see a reduction in midday peak generation, but generate more KW per day because they are exposed to light longer - as days lengthen.

 

[SolarCity]

The sun's orbit changes throughout the year.

Galileo would argue otherwise.

 

[Gavin A]

Galileo would argue otherwise.

yeah, but then he also got burned at the stake for his troubles didn't he?

 

[Vegelen]

Giordano Bruno was burned at the stake, not Galilieo, who died of a heart attack whilst under house arrest. Before burying Galileo they cut off 3 of his fingers and removed a tooth.
His middle finger is currently on display at the Museo Galileo in Florence.
I bet its sticking up in defiance against the human race, who through insecurity, mental instability or fear have a habitual habit of deriding or attacking concepts, people or entities they feel threatened by.

 

[shanky887614]

where is your inverter mate?

if its in an attic you need to be using this temp.

it should easily hit 40 in some attics