Sure, why not? This is the thought process I'd use:
As woo just said, it's possible to make your panels "follow" the sun such that the incoming rays are close to "normal." So first figure out how to do that, perhaps borrow someone's code.
If the rays are normal (coming in completely perpendicular to your array) you'll get something like 1000 W per square meter of sunlight (probably more in outer space), times the efficiency of the array (say 20%, possibly higher for newer advanced arrays). Use trig to calculate the fraction of the rays reaching the panel in cases where they're not normal, but coming in at an angle. Use the cosine of the angle. For example, rays coming in at 45 degrees to normal, you'd get ~0.7 times your "normal" amount.
So, let's say you have 4 square meters of array, and the best you can do is to get them to 30 degrees off normal to the incoming light. Assume spacecraft shadows are not a factor. Then you'd have 4 m^2 x 1000 W/m^2 x cos(30) x 20% efficiency = 692.8 watts of electricity.