EC

Hello Duncan, Thank you very much for your help and your advices. Best regards, Eurico

Hi, October, November and December 2012 were omitted during upload. Sorry! http:// img812.imageshack.us/img812/930/fpu9.png Yes, I made separate tab files for each month. When I have data from the same month in more than one year I join that in a single tab file. I made calculation for each month and in this case I am not applying weighting according to the different number of days, I am dividing per 12. Thank you! Eurico

Hi, Please, can someone explain me why is there difference between annual energy production and sum of energy production of all months? You must see image below: http:// postimg.org/image/mrosqnacj/full/ Best regards, Eurico Cordeiro