Battery Storage Computed Inputs

Paul Gilman

28 Oct 2016 21:29 #4856 by Paul Gilman

Replied by Paul Gilman on topic Battery Storage Computed Inputs

Hi Tane,

the INOUT variables are passed from other modules to the battery module and are not modified by the battery module:

hourly_energy is the AC output of the PV system
e_load is the building's AC load

Best regards,
Paul.

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tmartin
Topic Author

31 Oct 2016 00:16 #4857 by tmartin

Replied by tmartin on topic Battery Storage Computed Inputs

Ok thanks Paul. I was under the impression that INOUTs were variables that were passed into the module, altered, and then passed back out.

If one were to pass the DC output of the system into hourly_energy, would that effectively result in the battery being on the DC bus? Or is the module built in such a way that AC output is the only valid input?

Tane

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Paul Gilman

31 Oct 2016 22:27 #4858 by Paul Gilman

Replied by Paul Gilman on topic Battery Storage Computed Inputs

Hi Tane,

In SSC Version 160, SAM applies the AC to DC conversion efficiency value to the hourly_energy value, so if you set that value to 100%, it would effectively be treated as DC energy.

Note that the AC to DC conversion input is intended to account for electrical losses in the charge controller in addition to rectification from AC to DC, so you might set the value to something lower than 100%.

However, the model still adds battery power on the AC side of the PV inverter, so you cannot use this approach in a system designed to use the battery to increase the DC/AC ratio.

Best regards,
Paul.

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