Battery

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robdenexter
robdenexter's picture
How to use actual solar data

Dear staff,

In order to model a battery case, I would like to know if it is possible to use an actual PV-generation profile instead of a simulated profile from SAM. Thanks for your kind assistance.

Rob den Exter

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REV
Battery, Demand Charge?

Hi SAM team,

I'm a first-time poster on the support forum, but have used SAM quite a bit the past few years--many thanks for the spectacular tools you've created.

Question on battery themes--is there presently a way to include a demand charge, when modeling a PV + storage system in SAM?

Thanks & Best,

Brett

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randy
forecast for battery

I continue to struggle with an appropriate dispatch model for a battery in SAM. Day-ahead assumes perfect knowledge of the next day (not reasonable) or Day-behind which is described as worst-case naive control (from Overview of Automated Dispatch Algorithms in SAM, N DiOrio, Aug 2017).
So my choices seem to be perfect-case versus worst-case. Does it make sense to run economics for both of these dispatch scenarios, and then choose a result between the two?
Randy

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randy
other models

Wondering what NREL thought of the EPRI Storagevet.com modeling tool? Comparable to SAM? Better/worse? Pros/cons?
Thanks.

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randy
dispatch

I'm sure I read this somewhere, but curious about the difference between the day-look-ahead versus the day-look-behind dispatch model. I assume look-behind represents perfect dispatch versus look-ahead which is the algorithm's best guess at dispatch. And that the difference illustrates how well the day-ahead logic compares to perfection?
Thanks.

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randy
utility rates

SAM nicely accesses utility rates available on the open EI database. However, some demand rates are denominated in $/kW per day versus $/kW per month. SAM imports the daily demand charges without converting them to monthly values. Is it true that SAM is not smart enough to recognize these as daily values, and that you must manually convert daily demand values to monthly values? That is, a $0.50/kW per day must be transformed into a ~$15/kW per month value by hand?

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hendrj202
Specific residential Batteries

I am interested in modeling specific batteries (Powerwall 2, Resu10, etc.). I know that I can enter the desired bank size, chemistry, cell capacity, and other information, and that SAM will fill in the computed properties. This is probably close enough, but are their any plans to include the option of selecting name brands batteries with their actual specs, as opposed to the computed specs?

My intended use case is to use the variables in the SDK.

A followup question:

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hendrj202
options for batt_meter_position

Using the SDK I find a variable batt_meter_position, but I haven't been able to find a description in any of the documentation. The options appear to be 0/1. Changing only batt_meter_position does change the outputs of the script.

Thank you.

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BandGap1.1eV
Battery not discharging

I’m having difficulty getting my battery to dispatch for a grid tied, stand-alone PV array with DC coupled energy storage.

System sizes are as follows:
PV: 4.66 MWdc, 3.63 MWac
ESS: 2 MWdc, 4 MWhr capacity

It’s a standalone system so there is no load. The desire is to produce at nameplate (3.63 MWac) for as much time as possible with kWh’s being stored in the battery that would ordinarily be clipped, then allow the battery to discharge as daylight fades to maintain 3.63 MWac of output.

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BandGap1.1eV
Stand alone PV plus energy storage

I'm trying to model a megawatt scale stand alone PV array with DC coupled energy storage. No matter what discharge option I try to utilize, the ESS will not discharge and only remains at 100% SOC.

System sizes are as follows:
PV: 4.66 MWdc, 3.63 MWac
ESS: 2 MWdc, 4 MWhr capacity

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