Morteza Posted June 25, 2023 Report Share Posted June 25, 2023 Hello dears I couldn't find the answer of my question in other topics so I make a new one. In attached picture I have mentioned three points that represent I have enough battery charge or the energy production of PV is sufficient to cover my consumption, but still system takes the power from grid. it makes sense during Jan or Dec that I feed from grid, but I want to know can I make it zero in June or other months with same potential? Quote Link to comment Share on other sites More sharing options...
developer_mh Posted June 26, 2023 Report Share Posted June 26, 2023 Hi morteza khaledabadi, could you provide the project file, please? You can send it to me as a private message here in the forum. As the consumption values are very small, it might be that the inverter is not able to deliver the energy from the batteries to the consumers due to the starting voltages or power values. Kind regards, Martin Quote Link to comment Share on other sites More sharing options...
Morteza Posted June 26, 2023 Author Report Share Posted June 26, 2023 Thank for your prompt answering I couldn't upload the file directly, so I have uploaded it in an alternative server and here is the link: https://filebin.net/tif3y5il4uvhjs5j Quote Link to comment Share on other sites More sharing options...
Morteza Posted July 3, 2023 Author Report Share Posted July 3, 2023 Hello dears, Is there any solution or suggestion? Quote Link to comment Share on other sites More sharing options...
developer_mh Posted August 2, 2023 Report Share Posted August 2, 2023 Hi Morteza, sorry for the late answer. And I am afraid that I didn't have a chance to download the project file so far. Could you please upload it again. I am very sorry for the inconvenience caused. Kind regards, Martin Quote Link to comment Share on other sites More sharing options...
Morteza Posted August 2, 2023 Author Report Share Posted August 2, 2023 Here you are P20230001-Roberto Extended.pvprj Quote Link to comment Share on other sites More sharing options...
developer_mh Posted August 3, 2023 Report Share Posted August 3, 2023 Hi Morteza, thanks for the project and your patience It is like I suspected. The load profile has very low values in comparison to the nominal power of the PV inverter, in the range of under 5% utlisation. The points you marked with a blue X refer to load values of 100 to 300 W, with the nominal power of the Huawei SUN2000-8KTL-M1(380Vac) of 8 kW, it gives us utilisation ratios of 0.1/8 = 1.25% to 0.3/8 = 3.75%. This means, the PV inverter (to which the battery system is connected on the DC intermediate circuit) operates in a very suboptimal range in terms of efficiency: What happens is that the load profile needs e.g. 100W from the battery system at night, and 100W are discharged from the batteries. But the PV inverter effiency is so low that a great part is lost on the way from the battery through the PV inverter to the loads on the AC side. All that is lost needs to be compensated for by the grid. This is why there is often energy from grid in the simulation (and also in reality, depending on the specific setup and the location of the load sensors). Since we have a lot of questions in this regard, in the next major version we will modify the logic so that we take into account the effiency of the PV inverter beforehand, i.e. if the load needs 100 W, we will discharge a lot more from the battery, say 400 W, so that 100 W are still reaching the load in the end. Hope that helps, kind regards, Martin Quote Link to comment Share on other sites More sharing options...
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