hi
I have a old ferraris type energy meter. Every turn in a non fixed interval is corresponding to 0.75 kWh energy. Every turn I send the value of 0.75 to emoncms. The value is logged and I can add it to a feed. So far everything is ok. But I don't get it how to configure emoncms to display the actual power (kW) in a diagramm. If I would have to code something to do this, I would count the time between 2 impulses and calculate so the power. Is there a feature in emoncms to do this and showing me the kW power in a diagramm just by analyzing fixed kWh impulses in a non fixed interval?
Re: how to convert kWh to W
if no one can help me, I have to count the impulses in a fixed interval and send this value to the server. That would work but I wonder if there is are other way.
Re: how to convert kWh to W
In the emonTx sketches, the timing to convert pulses to watts is done there. But there's an inherent problem: no matter where you do the calculation, you can only estimate the average power historically - over the interval from the preceding pulse to the present one. I think that's why many people use both CT and pulse inputs - the pulse feed gives an accurate measure of energy (especially in the long term) and the CT gives an instantaneous reading of power.