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Proportion of year spent at each insolation level information

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fourtytwo42:
Has anybody seen any data available on this subject ?

There are plenty of tables giving the total insolation for a location and orientation BUT the results are usually totaled in Kw/h or similar.

What I am interested in is a set of figures giving the total hours spent at each insolation level within that total.
I have a completely weird reason for wanting to know based around having a fixed load resistance and no MPPT.

Of course I think its a bit unlikely so I am trying to derive my own figures with lots of holding ones finger in the wind, but I like grasping at straws too so perhaps there's something out there ?

CatalinaWOW:

--- Quote from: fourtytwo42 on June 02, 2017, 06:09:14 pm ---Has anybody seen any data available on this subject ?

There are plenty of tables giving the total insolation for a location and orientation BUT the results are usually totaled in Kw/h or similar.

What I am interested in is a set of figures giving the total hours spent at each insolation level within that total.
I have a completely weird reason for wanting to know based around having a fixed load resistance and no MPPT.

Of course I think its a bit unlikely so I am trying to derive my own figures with lots of holding ones finger in the wind, but I like grasping at straws too so perhaps there's something out there ?

--- End quote ---

Doing searches for daily insolation or monthly insolation has always given me what I needed.   There are maps that let you zero in on the average values over fairly small regions.  Unit conversions are often required to get the form of information you want.

You are on your own for the site specific variations from these averages.  If you live behind a tall building, or in a deep valley things can be very different.

Someone:
Thats something the meteorology department does:
http://www.bom.gov.au/climate/data/oneminsolar/about-IDCJAC0022.shtml
The met office has the data somewhere:
http://badc.nerc.ac.uk/data/surface/radt_file_format.html

fourtytwo42:
Thank you for your replies :) I should have said I am in the UK and our met office wants to sell most data.
I found this site http://www.pveducation.org/pvcdrom/calculation-of-solar-insolation that gives basic data without weather corrections but I also use a weather forecast that gives me cloud cover. I will post whatever fudged data I manage to produce here for your amusement in a few days.

fourtytwo42:
I should entitle this lies and damm statistics BUT as promised here is my chart adjusted for seasonal and weather variations. It compares the power that could be derived from a 1Kw PV system using MPPT and that derived using a simple restive load (in this case 20R heater). The idea is to determine the real gain of MPPT in this situation and if it is economically justified. Of course the chart is very situation dependent but here in the UK the average insolation is quite low and we have a fair amount of cloud cover, the resistive load matches MPPT at about 70% insolation.
Plotting the resistive load line against MPPT for different insolations makes you believe there is a lot to be gained but when you factor in the hourly insolations and weather the losses are not so large.

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