Anyone could explain to me why the Energy Supply Account results are different when we use the same parameters to simulate two different projects? I mean, sometimes PV*Sol accumulate the amount of energy consumed above the energy produced to the next month, which is wrong here in Brazil and, sometimes, PV*SOL works properly and put this amount in Statement account, which is correct. I attached two images showing this behavior and I would like an explanation since it is preventing me to offer my services based on PV*SOL simulations.

Hello IFASolar,

indeed, that sounds a little strange. Could you send me these two projects by private message? Then we'll have a closer look at the problem.

Kind regards

Marcel

IFASolar,

I´ll reply in English, but we can continue in Portuguese if you write to the Brazilian support e-mail pvsol@solarize.com.br.

Let me explain your cases:

In the first case, your pv system creates credits between february and august (line "new credit"). In september, october and december, you use these credits to get the "statement of account" down to the minimum consumption that you have defined, 50 kWh per month. In december, there aren´t enough credits, so the statement of account results in 54,94 kWh.

In your second example, the pv system creates credits in several months between march and december. Some months use these credits, but there would be a rest by the end of the year. What would happen in reality? The customer would take the credits from december to the second operational year and use them in january of year two (or even in more months). Following this logic, the "used credit" in the january account is the rest of the first year. 

Did  I explain it clearly?

Regards,
Hans

Now It is clear. The negative values in Credit account line had confused me. I made some calculations based on the logic that you explained and the Statement of account is correct.

Thanks for your help Hans and Valentin Team.

Best,

Igor