WEBVTT 00:00:00.800 --> 00:00:04.400 Hi there, this is Solomon here from PV Lighthouse. 00:00:05.120 --> 00:00:08.285 Today I'll be taking you through our latest update to ... 00:00:08.285 --> 00:00:11.666 SunSolve Yield where we've now automated the process of ... 00:00:11.666 --> 00:00:15.191 generating bifacial correction factors for view-factor ... 00:00:15.191 --> 00:00:16.558 programs like PVsyst. 00:00:17.840 --> 00:00:22.088 Previously you were able to do these corrections manually ... 00:00:22.088 --> 00:00:25.989 using SunSolve by repeating a series of simulations, 00:00:25.989 --> 00:00:30.410 starting with a base simulation that accurately represents ... 00:00:30.410 --> 00:00:34.831 your bifacial system and then adding different simulations ... 00:00:34.831 --> 00:00:38.558 which allow you to calculate each of these factors. 00:00:39.680 --> 00:00:43.098 Now we've automated the process so that you can ... 00:00:43.098 --> 00:00:47.130 instead just select which correction factors you need ... 00:00:47.130 --> 00:00:49.759 and then hit play when you're ready. 00:00:49.920 --> 00:00:53.713 In order to get on the Outputs tab a list of the correction ... 00:00:53.713 --> 00:00:57.587 factors that you'll then need to plug into a software like ... 00:00:57.587 --> 00:01:01.300 PVsyst to correct the view-factors approach and get ... 00:01:01.300 --> 00:01:04.770 more accurate rear side irradiance and therefore a ... 00:01:04.770 --> 00:01:07.837 more accurate yield assessment of your site. 00:01:09.600 --> 00:01:12.722 This process has been covered in a previous video ... 00:01:12.722 --> 00:01:15.921 which you can find under SunSolve yield videos and ... 00:01:15.921 --> 00:01:19.424 also in a white paper which you can find under Resources ... 00:01:19.424 --> 00:01:22.775 > White papers under 'Extracting PVsyst Inputs with ... 00:01:22.775 --> 00:01:23.917 SunSolve Yield'. 00:01:24.920 --> 00:01:28.840 In this white paper you'll see full details about what these ... 00:01:28.840 --> 00:01:32.603 different correction factors correspond to and where to ... 00:01:32.603 --> 00:01:35.974 type them in PVsyst in order to make your simulation ... 00:01:35.974 --> 00:01:40.599 correspond to the ray traced rear irradiance calculated in SunSolve. 00:01:42.840 --> 00:01:46.920 So now I'll take you through the process to create such a simulation. 00:01:48.440 --> 00:01:51.753 So first you'll want to load your simulation file or if you ... 00:01:51.753 --> 00:01:54.445 don't have one yet, you might start with a fixed ... 00:01:54.445 --> 00:01:56.239 bifacial system, for example. 00:01:58.000 --> 00:02:01.440 Then you'll want to go to the Inputs tab and add your weather. 00:02:02.160 --> 00:02:06.696 In this case we'll choose the Atacama desert and to speed ... 00:02:06.696 --> 00:02:11.039 things up a bit we'll just limit ourselves to one week. 00:02:11.840 --> 00:02:15.476 So now under system you can see we've got ourselves a ... 00:02:15.476 --> 00:02:19.112 fixed bifacial system and we can add in some lateral ... 00:02:19.112 --> 00:02:23.678 spacings which will be important for the transparent fraction. 00:02:24.640 --> 00:02:30.240 So we can add a 30 mm lateral spacing between unit systems. 00:02:30.800 --> 00:02:36.000 Here the unit system is three lateral modules in a 2P configuration. 00:02:36.560 --> 00:02:39.600 Then we can add a 10 millimeter lateral separation. 00:02:44.400 --> 00:02:47.361 Now if we go to the Analysis tab, 00:02:47.361 --> 00:02:52.372 you can see this screen where we've got the ability to ... 00:02:52.372 --> 00:02:57.839 select which correction factors we'd like to calculate. 00:02:59.120 --> 00:03:01.822 So we'll go ahead and select rear shading, 00:03:01.822 --> 00:03:04.601 transmission, front and rear mismatch and ... 00:03:04.601 --> 00:03:05.759 weighted albedo. 00:03:06.400 --> 00:03:10.700 There are also the options for other evaluation metrics to ... 00:03:10.700 --> 00:03:14.561 compare like spectral correction and bifacial gain ... 00:03:14.561 --> 00:03:18.422 which will be covered in another video So if I click on ... 00:03:18.422 --> 00:03:20.089 'Run simulation' now, 00:03:20.089 --> 00:03:24.653 it'll start calculating first the base simulation and then in ... 00:03:24.653 --> 00:03:28.602 pre analysis we'll see it start to calculate the other ... 00:03:28.602 --> 00:03:30.796 simulations that are needed. 00:03:32.640 --> 00:03:35.090 Once you get to the pre analysis stage, 00:03:35.090 --> 00:03:39.072 this is the stage at which the different simulations are being ... 00:03:39.072 --> 00:03:42.747 run that are compared to the base simulation to calculate ... 00:03:42.747 --> 00:03:44.278 the different factors. 00:03:45.080 --> 00:03:49.859 This includes for rear shading, a simulation where all the ... 00:03:49.859 --> 00:03:54.638 structure behind the modules is set to transparent so that ... 00:03:54.638 --> 00:03:59.319 there will be no rear shading as in view-factor programs. 00:04:00.680 --> 00:04:04.680 There's also for transmission, a stage where any lateral ... 00:04:04.680 --> 00:04:08.680 gaps are set to zero and any vertical gaps are filled with a ... 00:04:08.680 --> 00:04:12.513 absorbent material so that no light is getting through ... 00:04:12.513 --> 00:04:15.680 between modules as in view-factor programs, 00:04:15.680 --> 00:04:19.347 so that we can compare the two and see how much light is ... 00:04:19.347 --> 00:04:23.347 really transmitted through the modules and adding to the ... 00:04:23.347 --> 00:04:24.597 rear irradiance. 00:04:25.800 --> 00:04:29.021 Now that this is done, you can go to the Outputs tab ... 00:04:29.021 --> 00:04:33.028 under Analysis and see that all of your different correction ... 00:04:33.028 --> 00:04:35.935 factors are listed here, which means you can ... 00:04:35.935 --> 00:04:39.942 straightaway now go into your view-factor program and start ... 00:04:39.942 --> 00:04:41.277 copying these over. 00:04:42.080 --> 00:04:46.628 For example, the rear shading factor is ... 00:04:46.628 --> 00:04:50.211 17.3%, so we can put that in here ... 00:04:50.211 --> 00:04:54.208 structure shading factor as 17.3% 00:04:54.208 --> 00:05:00.135 and then for the transparent fraction we have a 3.8% 00:05:00.135 --> 00:05:02.478 transmission here. 00:05:03.920 --> 00:05:08.204 So we can put that in straight away as 3.8% 00:05:08.204 --> 00:05:11.480 for the weighted albedo 22.8%. 00:05:12.520 --> 00:05:15.080 So here we'll put this as 0.228. 00:05:15.960 --> 00:05:20.728 And then lastly for the rear mismatch we have a 1.9% 00:05:20.728 --> 00:05:25.836 value which we can put over here in place of the default ... 00:05:25.836 --> 00:05:31.398 and then press OK and continue with our PVsyst simulation. 00:05:32.600 --> 00:05:38.200 So this was found under bifacial system within the ... 00:05:38.200 --> 00:05:41.000 system screen of PVsyst. 00:05:42.360 --> 00:05:45.605 This shows just how simple it is now with our automated ... 00:05:45.605 --> 00:05:49.355 update to get these correction factors with just the click of a ... 00:05:49.355 --> 00:05:51.879 button after setting up your simulation. 00:05:52.280 --> 00:05:55.217 And now you can put them directly into PVsyst, 00:05:55.217 --> 00:05:58.541 which should speed up your process for any bifacial ... 00:05:58.541 --> 00:06:00.319 simulations in the future. 00:06:01.120 --> 00:06:04.384 If you want more detail, you can download the ... 00:06:04.384 --> 00:06:08.707 analysis result by clicking on this download button under ... 00:06:08.707 --> 00:06:12.854 Analysis under Outputs and it will pull up a spreadsheet ... 00:06:12.854 --> 00:06:16.383 which has the results including the weather and ... 00:06:16.383 --> 00:06:20.177 then some of these different values that are used to ... 00:06:20.177 --> 00:06:23.883 calculate these correction factors as well as the ... 00:06:23.883 --> 00:06:28.383 correction factors on an hourly basis (or whatever your time ... 00:06:28.383 --> 00:06:30.677 step was for your simulation). 00:06:31.880 --> 00:06:34.834 We can then put these hourly values into a spreadsheet to ... 00:06:34.834 --> 00:06:37.976 observe how these correction factors are changing over the ... 00:06:37.976 --> 00:06:38.918 course of the day. 00:06:41.000 --> 00:06:44.777 There are some situations where this approach won't ... 00:06:44.777 --> 00:06:47.953 work as well and should be treated with a more ... 00:06:47.953 --> 00:06:51.988 sophisticated approach, such as systems with multiple ... 00:06:51.988 --> 00:06:54.477 orientations, as in this example. 00:06:56.000 --> 00:06:57.440 So that's it for this video. 00:06:57.600 --> 00:07:00.050 But if you have a system like this one, 00:07:00.050 --> 00:07:03.212 or if you have any other questions about this new ... 00:07:03.212 --> 00:07:05.583 approach, feel free to contact us at ... 00:07:05.583 --> 00:07:09.535 support@pvlighthouse.com.au and we'll be happy to answer ... 00:07:09.535 --> 00:07:11.037 any of your questions.