Grid Power to Load

[Mark]

Good Day,

In the project I have created, why will there be power supplied form the grid if there is enough Solar Power. I have activated the Daily profile so that only load is drawn from 12h00 - 16h00 but does not make a difference. Is there something I am missing?

 

 

 

[hotline_oh]

Dear Mark,

Thank you for your inquiry.

Roughly speaking, daily consumption amounts to 100 kWh. The PV system generates 43,247 kWh per year. Assuming an even distribution of solar radiation throughout the year, this would correspond to a daily production of 118 kWh. However, since the distribution varies significantly by season, it can be assumed that less than 100 kWh will be produced during the winter months. The energy storage system compensates only for daily (not seasonal) fluctuations; therefore, it is likely that energy will be drawn from the grid during the winter months.

You can use the Diagram Editor to view the specific times at which energy is drawn from the grid (red line).

If you wish, please feel free to send us the project file (*.pvprj) at hotline@valentin-software.com, and we will take a look at it.

[Mark]

Thanks, I sent the Project now.

[hotline_oh]

Dear Mark,

Thank you for sharing the project file.

Consumption does not take place only between 12 noon and 4 pm, but between 7 am and 7 pm. On a sunny day in November, a month with high levels of solar radiation, demand can only be met by solar power (including the battery) between 8 am and 6 pm. Electricity must be drawn from the grid for one hour in the morning and one hour in the evening. The battery is charged within an hour (8–9 am) and discharged within an hour (5–6 pm). With a usable capacity of 4.6 kWh, it is far too small to cover evening and morning consumption (before sunrise).

The battery capacity would need to be increased approximately tenfold to ensure a high degree of supply security even in June, a month with low solar radiation.

Excluding non-essential loads, the small 4.6 kWh battery is, of course, sufficient to cover essential loads.

We have sent you the screenshots from the diagram editor by email.