Battery

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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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randy
utility rate for excess generation

I have a scenario where the PV array intends to generate power in excess of the building load. Can SAM economics accommodate two rate schedules: 1) the avoided cost of paying the utility rate (used by the customer), and 2) the value paid to the customer for the excess generation (this will be less than the utility rate)

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johnkern17
Battery Storage Discharge Issue

Hi:

I am modeling Solar PV with Battery Storage using a manual dispatch for the Battery Storage. I've set the manual dispatch to discharge the battery during defined time periods during Weekdays. On weekends the battery does not discharge.

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randy
default load data

I may have asked a version of this question before, but it appears default load data provided by SAM does not align with start time defined by SAM help docs. Feb 2018 page 742 says SAM assumes January first is a Monday. Default load data I've pulled from SAM does not show a weekday (Monday) load until after 24 hours, suggesting SAM assumes January first is really a Sunday.
I apologize if this question has already been answered.

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toq1
battwatts input parameters

Where can I find the unit specifications/descriptions for the battwatts module in the SDKtool? I am interested in determining the options for the inputs for battery chemistry, dispatch, and meter position. There is no metadata listed describing the 0,1, or 2 options for these inputs.

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Giovani Dávi
Number of batteries

Dear colleagues,

I have a SAM model with PV and battery system. The battery system uses Lithium-Ion NMC battery type and cell capacity of 2.25 Ah. I select 'Specifiy desired bank size' with the following characteristics: 5 MegaWh battery capacity and 96 V battery bank voltage. I would like to know the number of batteries needed for this system.

Your faithfully,

Giovani Dávi

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lx9
Battery charging&discharging logic

Hello SAM support team,

Thanks for your dedicated efforts in designing and upgrading this software. I set up a simple PV-battery model and used storage dispatch controller to regulate battery behaviours. However, I am confused by the operational logic of battery in SAM, even after I read several use manuals mentioned in your website. There are three cases in my attached model:

Case1: Peak-shaving 1 day look behind. In the screenshot of case 1, I found between Aug1 and Aug10, battery system is not working even with sufficient SOC

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