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Waldmensch1 / venus.dbus-sma-smartmeter

A service for Venus OS, reading smart meter data from a SMA system (SMA-EM Speedwire Broadcast) and making the values available on dbus.
MIT License
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The reading of the current value is not correct in relation to the watts #2

Open siartec opened 4 months ago

siartec commented 4 months ago

Hello Thank you for your work. The reading of the current value is not correct in relation to the watts, is there any way to solve it? Thank you SMA corrent

Waldmensch1 commented 4 months ago

What is with L2 and L3? Which Meter you use? Does the Serial of your meter matches with the Serial shown in VenusOS Display?

siartec commented 4 months ago

Victron L2 and L3 are not connected because my grid is single-phase. The watts are correct because I've checked them. My meter is SMA EMETER-20.GR1.

siartec commented 4 months ago

The strange thing is that when consumption is high, the value seems to match. Meter

asmcc commented 4 months ago

In your special case with only one phase it is very complex to measure such small currents and powers. Furthermore, the "wattage" shows the so named active (also named real or effective) power. And for this power is the calculation of p = u * i is wrong. In your case with pulsated power in one phase this effect is more fatal and very difficult to measure. If you have reactive loads in your system, or the inverter is for example in so named "intermittend flow" (an that is possible with small loads) you will see such effects.

siartec commented 4 months ago

I have the inverter set to zero injection to the grid. Thank you for your information