Solar Pathfinder Assistant can calculate the output capacity of your panel monthly. Download the evaluation version enter your panel model or dimensions, latitude, longitude, orientation, tilt, etc. The orientation and tilt can be changed in the software so that you can fine tune the output to your personal usage.
Yes, it is very accurate. I have the full version that I use, shading can be entered and the calculations have been on. You can then compare it to your output to find if there are problems. Or use it to project monthly / yearly output and energy savings.
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