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As a result, it's possible that some of the fonts/colors may not display properly. Design Guide SunWize. I hope that you have found this tutorial useful. Here is my energy log spreadsheet, mirrored on Dropbox. Resume Examples > Worksheet > Solar Sizing Calculator Excel. The numbers above should be used as an estimation; your location, climate, age of existing water heater, building height and use may change the. Cash Flow Opportunity Calculator. Although Excel still supports the FORECAST function, if you have 2016 or later, we recommend updating your formulas to prevent any issues in case of a function deprecation. STEP 4: Lastly, click the "Solar Sizing Estimate" button to calculate your roof area, solar POWER and average daily solar ENERGY yield estimates*. Next, calculate the cost of your employee’s time per hour. These are not complicated models that will take you weeks to figure out. 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