This is how I worked out what sort of power to expect
Using
http://www.solarelectricityhandbook.com ... iance.html
Solar insolation is a measure of solar irradiance over of period of time - typically over the period of a single day.
The Average Solar Insolation figures for:
Gran Canaria
Measured in kWh/m2/day onto a horizontal surface.
This irradiance calculator takes data collated over a 22 year period to provide monthly average insolation figures.
This information is then used to calculate the average daily power generation a photovoltaic system will produce in any given month.
Average over the year:
5.339
The quick & dirty workout for estimated watt-hours per day.
Let's say you have 4 x 250W panels and the insolation number is 3, then the calculation is 4 x 250 x 3 = 3000 watt-hours per day.
Solar Irradiance Figures Gran Canaria.JPG
SO - 3 panels of 460W Solar insolation number is 5.339 = 3 x 460 x 5.339 = 7367 watt-hours per day.
OR - 4 panels of 460W Solar insolation number is 5.339 = 4 x 460 x 5.339 = 9823 watt-hours per day.
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