Model Results

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PV Results

Utilicé el SAM para simular un Photovoltaic (detailed) Residential (Distributed) System. El sitema tiene 6 paneles de 260 Wp en paralelo. EL hogar tiene un consumo mensual de 210 kWh. La energia de la red se compra a "Rates for energy Charges; buy ($3.70/kWh). Los resultados de SAM fueron: Annual Energy (year 1) 2299 kWh; Electricity bill without system (Year 1) $44.00, Electricity bill with system (Year 1) $ 37.00, Net savings with system $ 7.00. Me parece que el "Electricity bill without system" y el "Electricity bill with system" son muy bajos. Que hice mal?

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Brett K
"Value of electricity savings" differ for similar energy charge profiles

Hi all

I have been trying to understand SAM's energy charge model, however I get results that I dont understand or dont make sense. I would expect the "Value of electricity savings" in the cash flow results section to be the same for the attached two energy charge profiles but they differ.

Any help/suggestions would be appreciated.


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Jessica Mello K...
Dispatch Control


I've been trying to model my plant so that it won't work during the night. The way I've been working on it is by modifying the dispatch control. For the night hours - when I don't want it working - I've set the turbine out fraction equals to zero.

When I run the simulation, I usually get negative values for the System power generated - what do these negative values mean?

Also, what does negative values for TES Thermal energy into storage mean?

Jessica Mello

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AdamHolmer's picture
Peak power not affected when adding PV

My objective is to simulate a commercial building with PV + batteries. As a start, I modelled only PV, and saw that the cost from the demand charge (kW) did not change when PV was added to the building. This is strange, because you could clearly see that the peaks from the grid were reduced in sunny months, such as in July. In July, the building load peak is 185 kW, but the power received from the grid is only 140 kW because of the PV production, when looking at the time series plots. Anyway, the demand charge of $821 is the product of 185 kW times the fee of $4.44/kW and not $140.

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Simple Efficiency Model - Required Parameters


Thanks for providing the SDK, SDK tool and documentation. My task is to use the SDK to produce a simulation that matches the attached SAM project which is uses the Simple Efficiency Model.

I have not been able to do it. I'm about 6-8% above SAM Desktop. Weather files and weather data can obviously vary, but I've done weather file comparison so I'm fairly confident that is not the source of error. So my thinking is that some of the input parameters have not been set correctly in the SSC module and this is the source of the difference.

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Optimal Tilt and Azimuth

Hello Paul,

I have run a parametric analysis for two SAM models and generated somewhat surprising result for the maximum annual energy generation off of the PV system.

I expected the maximum annual generation to be generated from a PV system facing north (in the southern hemisphere), and at a tilt of roughly my latitude.

Instead, the optimal azimuth seems to be nearly 30 degrees off of north, towards the NE, while the optimal tilt is approximately my latitude. This seems to be rather far off. Have you seen this before Paul?

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Bulk CSV Exports

I have a mess of projects I'm modeling. I would like to export the summary, monthly, and annual data tables to csv for all the projects in bulk. All in one go instead of going from project to project and exporting each one by hand. Is it possible to script this in SAM? In case anyone's curious, I'm working up evaluations for several parcels of land in a small city. I want to get this all into something like R or Excel. I'm using R to make some prettier plots than SAM can do. Excel makes it easier to format tables for insertion into a written report.

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Negative production from pv simualtion


First of all, I'm very new to this software.

I'm trying to simulate PV production from my own weather file. It's a csv-file made in notepad that conatins
year,month,day,hour, GHI and DNI. The GHI-values are collected from a sensor, and the DNI values are calculated using the DISC model.

I'm only getting negative monthly production, no matter what size of the panels i choose.

3 posts / 0 new
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Is "send to excel with equations" well implemented in SAM 2017 in case of using moratorium debt?


Is "send to excel with equations" well implemented in SAM 2017 in case of using moratorium debt?

If I send to excel the cash-flow using moratorium debt the results are different If I am sending it to excel (WITHOUT equations) works well because you can read in the casflow page how SAM incorporates empty columns to model the moratioum years, but it does not do the same thing if I am using "send to excel WITH equations.

Of course, IRR and NPV are different for the same case.

Please, see the atachments.

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No simulation result with Ubuntu 16.10


I installed sam-linux-2016-3-14-r4 on a Ubuntu 16.10 machine.

The software opens, I can select a model and change the parameters.
However, when clicking the Simulate button, a process bar appears and disappears but the main windows still shows the system parameters. No graph, no results.

The error message in the terminal is:
(sam.bin:7973): Gtk-CRITICAL **: IA__gtk_range_set_range: assertion 'min < max' failed

Can you help?

I installed the windows version on the same machine running wine and it works.

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