Rogério Posted April 24, 2017 Report Share Posted April 24, 2017 Hi folks! Does anybody know how PVSOL calculates the return on assets (ROA)? I would be grateful if anybody could advise. Regards, Rogério. Quote Link to comment Share on other sites More sharing options...

developer_mh Posted April 25, 2017 Report Share Posted April 25, 2017 Hi Rogério, the return on assets (or return on investment) in general is your net income (after 20 years normally) in relation to your investments. I think it is best explained with an example (I took the example project "photoplan.pvprj"). In the results you have, amongst others, these figures (the important ones are bold): System Data Grid Feed-in in the first year (incl. module degradation) 10.966 kWh/year PV Generator Output 11,8 kWp Start of Operation of the System 01.01.2017 Assessment Period 20 Years Economic Parameters Return on Assets 4,41 % Accrued Cash Flow (Cash Balance) 9.346,78 $ Amortization Period 13,4 Years Electricity Production Costs 0,08 $/kWh Payment Overview Specific Investment Costs 1.400,00 $/kWp Investment Costs 16.464,00 $ One-off Payments 0,00 $ Incoming Subsidies 0,00 $ Annual Costs 115,25 $/year Other Revenue or Savings 0,00 $/year So, you invested 16464 $ in your PV plant, and after 20 years you have an acrrued cash flow of 9346.78 $. You have a return on assets (ROA) of 4,41 %, which you can think of as the virtual interest rate that you would have needed if you gave your investment (16464 $) to a bank for 20 years in order to get a total of 25810.78 $ (16464 + 9346.78 $). In other words, if you decided not to build the PV plant but invest your money in an asset with some interest rate, you would have needed an interest rate of 4,41 % to get the same net income in the end as with you PV investment. In our online help you'll find the formula for the cash value for more detail. This symbolizes the value of your assets in comparison to an investment in a bank account with a fixed intereset rate. If your cash value after 20 is 0 it means that you have the same ROA from your PV investment than you would have on a bank account for a given interest rate. And that is the way the ROA is actually calculated: In the fomula of the cash value you put in a interest rate (q), you get a cash value of xx, you put in a higher interest rate, you get a smaller cash value and so on, until the cash value is 0. The interest rate you have then is the ROA. That means, if you put in the 4,41 % as your return on capital, like so: you get an accured cash flow of approx. 0 $ after 20%: Economic Parameters Return on Assets 4,41 % Accrued Cash Flow (Cash Balance) 145,86 $ Amortization Period More than 20 Years Electricity Production Costs 0,12 $/kWh I hope this helped. If not, please don't hesitate to ask! Kind regards, Martin Quote Link to comment Share on other sites More sharing options...

Rogério Posted May 2, 2017 Author Report Share Posted May 2, 2017 Martin, Thanks for your prompt response. You correctly explained how the TIR (Tax Internal Rate of Return) works. For sure this is one of the most popular indexes to analyze a discounted cash flow. However, If we export PVSOL cash flow to na Excel, for example, and calculate the Tax Internal Rate of Return using function =TIR, you will figure out that the number you get is completely different from ROA in PVSOL. Have you ever reproduced in an Excel the ROA outcome you get in PVSOL? I simply cannot calculate it in Excel and thus cannot explain it to my customers. Thanks again for your time. Regards, Rogério. Quote Link to comment Share on other sites More sharing options...

Rogério Posted May 2, 2017 Author Report Share Posted May 2, 2017 Martin, Sorry, consider TIR = IRR funcion in Excel. TIR is portuguese version. Ragards, Rogério. Quote Link to comment Share on other sites More sharing options...

developer_mh Posted May 2, 2017 Report Share Posted May 2, 2017 Hi Rogério, the secret is that you'll have to calculate it on a monthly basis in excel. Sometimes you don't have full years in the beginning, e.g. when your PV system is connected to the grid on 01st of September, so we have to all of our financial calculations in PV*SOL based on months. If you want to calculate the IRR in excel, do the following: In our example above we have the investment of 16464.78 $ in the beginning (January of Year 01) and the operating costs of 115.25 $, which gives us -16,579.25 $. From month 02 to month 11 there are no costs or incomes, so you'll write $ 0 there. Then, in December you'll get the income from the feed-in tariff, 1,344.33 $ in our case. The data in your excel sheet will look like this: and so on, for all the years (21 normally). Now, when you calculate the IRR with Excel, =IKV(C5:C256) in our case or =IRR(C5:C256) in the English version, you get a monthly IRR or ROA of 0.368%, which you can multiply by 12 to get the 4.41% annual IRR/ROA. Of course, if you have starting dates other than 01st of January, you'll have to adapt your monthly cash flows accordingly. Hope this helps, kind regards, Martin Quote Link to comment Share on other sites More sharing options...

Rogério Posted May 2, 2017 Author Report Share Posted May 2, 2017 Martin, Bingo!!!! That´s the answer I was looking for. Thanks for your assistance! Regards, Rogério. Quote Link to comment Share on other sites More sharing options...

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