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Support for sub hourly


RAMVEA
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  • 2 months later...

+1 from me

  • It would be very helpful in anaylsis of measured data

  • In many jurisdictions billing is half-hourly basis

  • It would help with analysis where loads change frequently

  • Multiple meteo data sources provide sub-hourly inputs and it's a shame to throw that out!

...etc

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  • 5 months later...

... late to +1 but absolutely agree.

For modeling performance from built systems (with measured data), sub-hourly clipping losses can be very large.

For predictive models, you'd also need high-res meteo data. Not much available yet afaik, but looks to be coming more and more.

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  • 2 weeks later...

Hi,

Thanks for the feedback. Since this would be a very big change, a complete sub-hourly simulation is not on the horizon yet. However:

  • you can already import sub-hourly meteo data, and use it to perform a hourly simulation
  • we are currently working on a solution allowing a partial use of the sub-hourly data to address clipping losses

As johank points out there are not that many data sources just yet.

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  • 5 months later...

I think it would be a useful feature to allow the custom import and direct use (simulation) of measured weather data (without hourly averaging). I think it would be relatively straightforward to write a PVsyst wrapper where the data is preprocessed into several 8760s on the front end, run through the core PVsyst tool as normal, and then post-processed on the back end. Namely, 1-min. measurement data is split into (60) 8760 files, 5-min. data is split into (12) 8760 files, etc. on the front end. Then, normal PVsyst is run over a loop (60x or 12x, respectively), with the appropriate time shift for each run. Then, the resultant output files are recombined on the back end (back into a 1-min. or 5-min. data set, respectively). In other words, there are really no major changes to the core PVsyst tool needed in order to implement this feature to enable simulations of (at least) custom, imported subhourly measurement data. Thanks.

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  • 2 months later...

Chiming in here as another request for sub-hourly simulation, even a partial one as Michele O. of PVSyst suggests.  Misrepresented clipping losses can be high, especially in areas with frequent intermittent cloud cover (e.g. Texas).  @Michele Oliosi, can you please let us know when this "partial clipping loss" feature will be released?

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