Click on the images below to see irradiance figures for different angles:
Optimal Year Round
Adjusted throughout the Year
Best Winter Performance
Best Summer Performance
Solar Energy Calculator
Using the calculator
Use the application on the right to retrieve the solar irradiance figures that best match your location and the orientation of your panel. Tip: If your panel is horizontally mounted, then just select any direction in the 3rd drop down box "Solar Panel direction".
Change the values in the boxes below for:
Size of Panel
Daily Solar Insolation (sun hours)
Size of your Batter (Amp hous).
Change the values in the boxes
Interpreting the figures
Think of Daily Solar Insolation as the average number of "sun hours" per day for each month.
To estimate the number Amp hours (Ah) of electricity a panel can produce in a given month the calculator (above) uses the following equation
Panel Rating (Watts)
Average Daily Output (Ah)
Let's say a value of 4 is given for July, it is equivalent to your solar panel receiving full, direct sunlight, for 4 hours each day.
Thus If you have a 100W solar panel, then in July it will produce 4 x 100 = 400Wh (Watt hours) of electricity per day.
To convert this to Ah (Amp hours) you can divide it by 17V (the voltage the panel produces at maximum power output).
So a 100W panel will make
approximately 24Ah of electricity per day, on average, with 4 sun hours of irradiance.
*excluding Islands, for orders over 2kg, (Isle of Whight, Isle Of Man, Isle of Scilly and Channel Islands).
For all other destinations, worldwide the shopping cart will automatically search the available couriers to find the best price.
30% Off Accessories and Charge Controllers
*when baught with any Solar Panel, Solar Charging Kit or Inverter
For all products purchased through this website, SunSprite is happy to offer a 30 day money-back guarantee. If you have not damaged
or altered the product feel free to return it within 30 days and we will refund your purchase in full. More information.
For your convenience and peace of mind, SunSprite uses PayPal Secure Payment to process all transactions.
Copyright 2011 - 2014. All rights reserved by SunSpriteMembers Area