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**General PV Discussion / Re: Example Question Corrections**

« **on:**March 23, 2012, 07:42:35 PM »

Here's how I did it:

(6900kwh x .90/365) / 4.8 hours (latitude -15 tilt) x 1.25 = 4.43kw

The latitude -15 comes from the fact that the roof is at 26 degrees which is 15 degrees less than the latitude of 41.53 degrees. The 1.25 factor is the reciprocal of .8. Hope this helps.

(6900kwh x .90/365) / 4.8 hours (latitude -15 tilt) x 1.25 = 4.43kw

The latitude -15 comes from the fact that the roof is at 26 degrees which is 15 degrees less than the latitude of 41.53 degrees. The 1.25 factor is the reciprocal of .8. Hope this helps.