Solaranger Posted February 2 Share Posted February 2 I was simulating an on-grid PV plant with battery. After looking at the hourly data, I've got some Energy Battery Charge with negative value. I've got little confused about this value mean, because there's also Energy Battery Discharge value in the hourly dataset. Link to comment Share on other sites More sharing options...
Linda Thoren Posted February 2 Share Posted February 2 Dear Solaranger, Indeed the values here looks a bit strange. Please send your project file to support@pvsyst.com and we can have a closer look at it. Kind regards Link to comment Share on other sites More sharing options...
André Mermoud Posted February 7 Share Posted February 7 Thank you for your project. This is indeed a bug. This arises with very little powers, i.e. when the charging power is below the DC converter efficiency threshold. The simulation does not correctly take the efficiency limit into account (the efficiency becomes negative). NB: this is particularly apparent in your system, where you have defined a DC converter of 500 MW (!). The threshold for the efficiency profile is 1%, i.e. 5 MW. In your system, the maximum power necessary for charging the battery is 150 MW. I have corrected this for the next version 7.4.6. Link to comment Share on other sites More sharing options...
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