KWh to Power -> suspicious values

Submitted by xgon on Tue, 25/11/2014 - 18:53

Hello,

I have a energy meter that gives 1600pulses/KWh. So 1pulse=0.625Wh. I want to send to emoncms energy (Wh) and calculate instant power.

I send always the pulse difference.

I'm setting up a feed like this:

1   Log to feed   node:0:energy_log
2   x   0.625
3   Wh Accumulator   node:0:energy
4   x   0.001
5   kWh to Power   node:0:power

The Wh accumulator is ok.

At the moment I'm sending test values (random values between 1 and 10) every 5 seconds.

So the power should be between 450W (1*0.625/5*3600) and 4500W (10*0.625/5*3600), but the power sometimes is zero...

What I'm doing wrong?

Thanks

Re: KWh to Power -> suspicious values

Submitted by pb66 on Tue, 25/11/2014 - 21:00.

The Wh accumulator will subtract the current value from the last value as it increases and totals the difference. I think you want a standard "accumulator" that will just add each new value to the total, the first "log to feed isn't essential either, so you could try

x   0.625
Accumulator   node:0:energy
x   0.001
kWh to Power   node:0:power

Paul

Re: KWh to Power -> suspicious values

Submitted by xgon on Wed, 26/11/2014 - 11:29.

Thanks for the reply,

It works as expected.

Thanks.

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