If you've ever wondered how effective a solar oven would be in your area, there is now global map available on-line.
This is the map for Southern Africa:
|For other Global maps please go to: http://solargis.info/doc/71|
The maps are free for public use, their reproduction and adaptation is authorised provided the following source is acknowledged: SolarGIS © 2011 GeoModel Solar s.r.o.
At the moment SolarGIS don't seem to have maps for the US of A, Asia or Australia/ New Zealand - perhaps you could contact them to query? (They are based in Slovakia.)
Alternatively, from this site I found this map:
World Daily Solar Insolation Map.
This map shows the amount of solar energy
in hours, received each day on an optimally
tilted surface during the worst month of the year.
On the farm - I don't know at the moment, but I should be able to tell you by the 20th July - RMan shares his birthday with Mr Mandela, and he (RMan, that is) has decided that he'd like to spend it on the farm :-) Although Mr Mandela is very welcome too...
So, if all goes according to plan, I will be schlepping the solar oven along. Reckon it will be a very interesting experiment. Discovering just how much I can use the solar oven in winter will be a b-i-g plus for our off grid life...