Model Results

1 post / 0 new
Ismael
LCOE inconsistency, Cash Flow

Hi, I'm simulating a 100 MW central receiver CSP plant (without TES). In the "Summary" of results, SAM tells me that the resulting nominal LCOE is 26.02 cents / kwh, which coincides with the information shown in the "Cash Flow" tab. However, if I check the detail of the cash flow with the "Send to Excel with Equations" tool, it turns out that the nominal LCOE shown is 29.44 cents / kwh.

2 posts / 0 new
Last post
YK
system annual output

Hi,

I am trying to model a system like that:
13 x LG LG320N1C-G4 LG
1 x Enphase S280
Shading: Low
Tilt: 20.0

I know from a previous installation that this system annual output should be ~9MWh
but when I modeled that system on SAM I got ~1MWh (the system file attached).

I would be grateful if you could explain what I have done wrong.

Thanks
Yoav

3 posts / 0 new
Last post
YK
Annual outputs with different inverters

I try to predict the annual output of a simple system PV + inverter.
The PV is the Canadian Solar CS6K-260P.
When I check it with the SE 7600A-us(240V) 240V [cec 2013] the annual output was 13,795kWh
And when I check it with the SE 7600A-us(240V) 240V [cec 2016] the annual output was 7,951kWh
(Nothing but the inverter was changed)
Does the output difference seem normal?

Thanks
Yoav

2 posts / 0 new
Last post
tdornbusch
Electricity Bill with system not adding up

Hi!

When I get modeling results for my electric bill with system, it is higher than the sum of the demand charge with system (flat), energy charge with system, and fixed monthly charge with system. How can this be? I could see it being lower due to net metering credits, but am not sure what could cause it to be higher.

Second, what is the difference between demand charge with system (flat) and demand charge with system (TOU)?

Thanks for your help! I have attached a screenshot of my results if that helps.

1 post / 0 new
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?

2 posts / 0 new
Last post
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

2 posts / 0 new
Last post
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

2 posts / 0 new
Last post
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.

2 posts / 0 new
Last post
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.

2 posts / 0 new
Last post
Wainaina
Financial Model Documentation

Hi Paul

Are there updated Spreadsheets as tools to help you understand how SAM 2017.9.5 financial models calculate the different metrics on the Results? Current spreadsheets examples on SAM resources page seem to be out of alignment with the SAM 2017.9.5.

i.e -LCOE and NPV Calculations Using Excel Formulas
-Payback Period Calculation for Residential and Commercial
-Residential and Commercial Financial Models

Theme by Danetsoft and Danang Probo Sayekti inspired by Maksimer