About PV, Wind and Batteries

Hi Aldo,

For the solar water heating system, there is no excess electricity generation because the system saves electricity rather than generating it. The value of the monthly "excess generation cumulative kWh credit earned" output is zero, so the bars are not visible on the bar graph on the Summary tab.

You can see the actual values of the output variables on the Data Tables tab.

You can use the "Save rate to file" button on the Electricity Rates page to save the rate input data to a CSV text file. You can also use the "Save as CSV" buttons on the Data Tables tab to export data from tables, or right-click graphs to export data from graphs.

Best regards,
Paul.

Hi Paul.

In that sense, the energy saved by the system will never exceed the energy load?
I say this because it shows that in the months where there is more irradiation the energy does not increase beyond the load, in the graph of "monthly energy and load".
But in reality, there is more hot water than that that is saved in those months, or not?

Best regards.

For the solar water heating model, the building electric load is independent of the water heating system. The "energy saved" value depends on the solar water heating system as described in my final reply in this thread: sam.nrel.gov/forum/forum-general/59-payback-period-of-solar-water-heating-system.html#183 .

Best regards,
Paul.

Hi Paul.
I wanted to warn you that there are pdf files that do not open, so far I have seen that those that are "Technical Reference" do not open.
Best regards.

Hi Aldo,

Links to NREL publications were temporarily not working today. Please try again, and if you continue to have trouble, please let me know what specific links are not working.

Best regards,
Paul.

Hi Paul.

So far the only pdf file I can see is the SWH one, I still can't see the photovoltaic and wind files.
These are:
- Gilman, P.; Dobos, A.; DiOrio, N.; Freeman, J.; Janzou, S.; Ryberg, D. (2018) SAM Photovoltaic Model Technical Reference Update. 93 pp.; NREL/TP-6A20-67399.
- Freeman, J.; Gilman, P.; Jorgenson, J.; Ferguson, T. (2014). "Reference Manual for the System Advisor Model's Wind Performance Model." National Renewable Energy Laboratory, NREL/TP-6A20-60570.

I want to consult you about electricity rates:
- For the minimum charges of money, it happens to me that the net present value changes a lot if I put as a value, both monthly and annually, the minimum monthly energy charge multiplied by the rate of purchase of energy from the grid. As an example I am sending you my work, and in the photovoltaic analysis part you can see the difference between putting $ 0 and $ 150 monthly, and $ 0 and $ 1800 annually, which corresponds to what I mentioned (835.38 kWh corresponding to the energy load of November, multiplied by $ 0.18 / kWh for one month)
- I am following the "net energy metering with $ credits" format to calculate energy charges, in order to sell what I have surplus energy to the grid and thus be able to balance the net present value, but I have doubts about the management of the periods, tiers, purchase and sale prices. Here in my country the purchase price of electricity from the grid is $ 0.18 according to various sources, and so far I have not found information about the prices of selling energy to the grid. Is there a standard or efficient format that can be followed? All this I seek with the purpose of positively balancing my net present value and that the project is viable. I have seen the format that comes by default when starting a new project in SAM, but besides that I would not know how to apply another, since the regulations depend on who carries out the project, or not?

Best regards.