K24 Posted June 9, 2020 Report Share Posted June 9, 2020 Hello dear PVSol team, I have a few questions! Which results are more precise when applying feed-in control. should the minute values be activated for <10 kWp PV systems? Is there a specific diffuse radiation model that gives better results in this case? Thanks in advance and best regards! Quote Link to comment Share on other sites More sharing options...
Vishnu Posted June 9, 2020 Report Share Posted June 9, 2020 I am not sure about diffused radiation model but it is a good pratice to activate minute values when DC/AC ratio is above 1,15 and with batteries. It almost takes forever for the simulation but still 1 Quote Link to comment Share on other sites More sharing options...
K24 Posted June 9, 2020 Author Report Share Posted June 9, 2020 Thanks for your reply Vishnu! the DC/AC ratio is always around 1.0! Quote Link to comment Share on other sites More sharing options...
developer_mh Posted June 10, 2020 Report Share Posted June 10, 2020 Hi K24, as Vishnu pointed out, the activation of minute values is most of all important if you have sizing factors of above 115 %, or if you have battery systems or electrical appliances that are involved. If your DC/AC ratio is about 1, and you just want to analyse the feed in, you might be well off with hourly values. But I would always recommend to compare the results at least once. Just simulate your PV system with hourly values, save the results somewehre, and then simulate the same system with one-minute values. Then you'll directly see the differences for your specific case. Our recommendation for the diffuse model is Hofmann (disclaimer: that is me), but we don't recommend it just like that, we have scientific evidence that it performs best under nearly all conditions (especially when using one-minute resolution). See more on diffuse irradiation models here: https://help.valentin-software.com/pvsol/2020/calculation/irradiation/diffuse-irradiation/ Kind regards, Martin 1 Quote Link to comment Share on other sites More sharing options...
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