hese easy to follow worksheets use the MS Excel application and allow you to perform a cost/payback/profit analysis of a proposed system, an energy audit, and/or calculations to help you decide on an array size, modules and an inverter, wire gauges, etc. You can try different combinations of variables to see what gives you the most bang for your buck. All the math is done for you. Then you can print out the worksheets for later reference.

CAUTION: Use these worksheets at your own risk. Be sure to download the instructions and a sample page before starting a worksheet. If you need to access the worksheet menu page later, click the Resources Tab on any worksheet and then use the link provided.