Model Results

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stumpyd123
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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dagoski
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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havardnes
Negative production from pv simualtion

Hello

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.

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

Hello.

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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pablanche
No simulation result with Ubuntu 16.10

Hi,

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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chadmcelvany
Levelized Cost equations

I brought up the discrepancies between the the LCOE SAM equations and the LCOE definition listed in the SAM 2016.3.14 help at the roundtable on 2016/11/10.
Wondering if anyone has had a chance to look into.

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dburdjal
PV Generation Peak Varies During Parametric Analysis

Hello,

I am doing some parametric analysis where I am varying the PV capacity (5-10-15 kWDC), battery bank capacity (0-3-6-12 kWh), and dispatch choice (day ahead, day behind, auto grid target). While the annual power generated (annual kWh) remains pretty constant for a particular PV capacity, it seems that the production for the 5 kWDC option varies quite significantly according to the battery bank capacity.

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tmartin
System draws from grid, even when enough power could be supplied

Hi,

When I run the battery module the results show that there is power draw from the grid even when there is enough power from pv+battery to supply the load without the grid. This happens both when I use the SSC battery module and my own matlab code, or through SAM. The draw is not much, typically watts or tens of watts, but it is significant for my use (modeling an off-grid system). Initially I thought that the pv+batt system was undersized, but it seems to be an issue even when I significantly increase the capacity of both.

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tmartin
Battery Storage on AC vs. DC bus

Hi everyone,

This may be obvious to some, but why is the battery storage model on the AC bus only? In practice is this how systems are designed? It would seem to me that placing the battery on the DC bus would negate the additional DC-AC, AC-DC, and then back DC-AC efficiency losses created by placing the battery on the AC bus as opposed to the DC bus.

If in practice the battery is on the DC bus would that be a feature that could be added back to SAM? I read elsewhere that SAM used to have it.

Tane

1 post / 0 new
Saif91
1-axis Tracker Self-Shading

Hi,

I'm facing some trouble with SAM's self-shading modeler. I am trying to model a 1-axis horizontal tracker (E-W) but it seems that the software algorithm only takes into account the vertical row spacing which I am able to use effectively only for fixed tilt systems.

In the system that I'm trying to model, there will only be horizontal row spacing between the panels (portrait orientation) to account for self-shading due to E-W tracking. I want the vertical row spacing in this case to be 0 (vertically contiguous). How do I model such a system on SAM?

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