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NREL / ssc

SAM Simulation Core (SSC) contains the underlying performance and financial models for SAM
BSD 3-Clause "New" or "Revised" License
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Zeroes in output #1171

Open ilozka opened 4 months ago

ilozka commented 4 months ago

Battery analysis using a 3-battery configuration gives acceptable results. But the same analysis for a 2-battery configuration gives lots of zeroes in the batt_annual_charge_energy, batt_annual_discharge_energy and other output variables. LK files attached.

The 3battery script gives the following result: [ 6694.57, 6681.41, 6669.19, 6656.1, 6644.09, 6632.22, 6621.02, 6610.46, 6599.98, 6589.87, 6597.16, 6583.9, 6571.53, 6559.71, 6548.62, 6537.52, 6524.22, 6511.54, 6498.89, 6482.25, 6494.04, 6476.61, 6459.39, 6443.02, 6427.03 ] [ 6563.07, 6541.77, 6527.72, 6514.61, 6501.17, 6488.46, 6475.46, 6462.4, 6448.98, 6436.68, 6457.17, 6442.74, 6427.34, 6413.91, 6400.17, 6387.26, 6371.41, 6354.13, 6333.36, 6310.64, 6342.77, 6321.61, 6303.17, 6283.93, 6261.54 ]

While the 2battery script returns the values below - not sure if the numbers are correct. Thank you for checking this out.

[ 25.814, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6033.01, 5874.5, 5742.03, 5619.59, 5486.05 ] [ 29.0689, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3.54411, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5789.5, 5612.32, 5473.48, 5341.57, 5196.36 ]

3batt.lk.txt 2batt.lk.txt

cpaulgilman commented 3 months ago

@ilozka Could you provide some context so we can understand the project you are trying to model and the results you are exploring? It would also be helpful if you could attach the .sam file you used to generate these scripts.

Thanks, Paul.

ilozka commented 3 months ago

We're calling the battery simulation directly based on the battery selections in our application, so I can't provide any .sam file for this scenario - wondering why the 2-battery config returns zeroes for batt_annual_charge_energy and batt_annual_discharge_energy - if you compare those two LK files, you can see that the input differences are minimal, however, the result is different - why batteries are not charged and discharged if we have 2 of them instead of 3?