Isolated or independent PV-systems

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yunling.li
Isolated or independent PV-systems

Hello!
I'm doing a project about PV-residential/commercial taking Piura,Peru region as a reference and I'm analyzing how the project will change if enable battery; but I don't know how to set up that the battery only load from the system.
Also, I know the program simulate different projects that are conexion to the grid and when there are excess generation,these energy is injected to the grid. However, in Peru can not perform the same.
So how I can simulate a independet system without conexion to the grid; with battery storage that load with the excess generation and when the system cannot provision the necessary electric load, the battery cover the demand and no the grid .

Please If you have a video with an example about this. Let me know.

Thanks you.

Paul Gilman

Hello,

Please see this post for information, including a link to a webinar recording, about using SAM to model a battery-only system:

https://sam.nrel.gov/node/69715

SAM always assumes that the system is connected to the grid. However, you can design the PV and battery system to avoid consuming grid power.

Best regards,
Paul.

yunling.li

Hi Paul, do you have any example or video where the design the PV and battery system to avoid consuming grid power?

Thanks you

Paul Gilman

No, I do not have such an example. You would basically need to make the PV array and battery bank large enough that "Electricity from grid" is zero or very small over the entire year.

Best regards,
Paul.

yunling.li

So if the system is connected to the grid, how I can do that the excess generation don't be injected to the grid?

Paul Gilman

You can ensure that the project does not receive payment for power injected to the grid by setting the sell rate on the Electricity Rates page to zero.

It is not possible to prevent power from being injected to the grid. "Electricity to grid" represents the excess power that needs to be managed by the system with dump loads, additional storage, or shifting existing loads.

Best regards,
Paul.

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