Model Technical Details

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Michael La Marca
Modeling DC Optimizers with Multiple MPPT Feature

I would like to model the following residential system that uses a string inverter with DC Optimizers:

Modules: QCells Q.Peak BLK-G4.1 295 (295W Monocrystalline 60 cell module)
Inverter: SolarEdge SE5000H HD Wave Inverter (so could use SE5000H-US [240V] 240V [CEC 2018] in SAM
DC Optimizer: SolarEdge P350 Optimizer

The configuration is:

Array 1: Tilt 20, Azimuth 180 - 16 modules on string all with P350 Optimizer
Array 2: Tilt 30, Azimuth 270 - 6 modules on string all with P350 Optimizer

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FrankNam
FrankNam's picture
SAM TES dispatch w/solar

Good day Paul

I trust all is well. I had a pleasant time with Craig and Mark at SolarPaces. You weren't there were you?

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FrankNam
FrankNam's picture
W/o solar power output difference

HI all

I am having trouble with results from the same model but two different input weather files. The one I run with meteonorm data for a location, the other I run with ground measured data entered into an existing SAM resource library file. (any advice on doing this the "right way" would be appreciated).

Please see the graphs attached. Can anybody explain why the meteonorm profile is higher during night-time operation than the ground-measured data night time operation?

Thanks
Frank

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FrankNam
FrankNam's picture
Parasitic power solar field HTF pump electrical power usage

Hi Paul and team

Simple question about the Parasitic power solar field HTF pump electrical power usage. I have had a look through the forum, the help file and the physical trough report. I am battling to find how this parasitic demand is calculated. In my results, the value rarely exceeds 1.3 MWe, which is way too low. Most plants I have seen in SA have installed capacities of around 3x 2 MW or more.

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FrankNam
FrankNam's picture
Cooling tower water use results_reply

Hi Paul

Thanks for the support.

From the Equation 3.25 of the Physical Trough Reference Manual, could you please indicate which value is being reported in the time-series results of SAM as "Hourly Data: Cycle cooling water mass flow rate - makeup (kg/hr)",i.e. is it mdotwater or mdotcw?:
mdotevap = qdotrej/hevap
mdotdrift = fdrift mdotcw
mdotctbd = fctbd mdotcw
mdotwater = mdotevap +mdotdrift +mdotctbd

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tdornbusch
Near Shading Losses

I am trying to replicate in SAM a solar PV system model that I have created in both PVSyst and PlantPredict. The models in these two systems are within a <1% error, but the SAM model is showing about a 4% error in comparison. The biggest discrepancy I see is that my SAM model shows .271% shading loss, while PVSyst shows 2.6% and PlantPredict shows 2.46%. There are also a couple of other smaller gaps.

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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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bobbyharris1994
Differences between SAM Sandia Performance Model and PVLIB

I am running a simulation of solar generation for every zip code in the U.S. using SAM and its LK scripting interface. I am also performing the same simulation with Sandia's PVLIB (https://pvpmc.sandia.gov/applications/pv_lib-toolbox/) model. It is my understanding that SAM's Sandia PV Arary Performance Model should yield the same results as PVLIB if the weather inputs are the same. However, I have tested this using TMY3 weather files, and the AC generation output is different, even with the exact same parameter settings.

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Sophia Huang
Electric Load Format

Hi Everyone,

As soon as I was in the final step to create and upload load data, I realized that somehow it's not taking my hourly data. A message popped up saying that data file does not contain 8760 value lines, only 0 found. Perhaps SAM will only analyze the data in certain format? What is it? Should I remove the header and adjust anything on my hourly data on excel spread sheet?

Thank you.

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adkaner
Self-Shading options - Grayed Out

How do I adjust the parameters in "Array Dimensions for Self Shading and Snow Losses" area for a single-axis tracker. The values are not correct, but are un-editable.

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