use only one sensor...

Submitted by Guest on Mon, 09/05/2011 - 11:51

Is it possible to make accurate energy measurements using only the current sensor since the voltage remains constant?

Harry

Re: use only one sensor...

Submitted by glyn.hudson on Mon, 09/05/2011 - 22:35.

Hi Harrys,

I answered a very similar question in this thread:

http://openenergymonitor.org/emon/node/148

Hope this answers your question.

All the best, Glyn.

Re: use only one sensor...

Submitted by harrys (not verified) on Tue, 10/05/2011 - 14:46.

Thank you very much for your answer Glyn.

According to your experince can you give me an estimate of the % accuracy loss due to the use of only the ct sensor?

regards

Harry

Re: use only one sensor...

Submitted by glyn.hudson on Sun, 15/05/2011 - 19:57.

Hi Harry,

To be totally honest I am not sure, it will obviously depend on the applications consuming the power which you are monitoring. I intend to do some testing soon.

For comparison:

The mains AC non-invasive 3.0 energy monitor design which measures voltage as well as current achieves a real power accuracy of 3%, click here to see full test results.

Owl monitors which like emonTx only measure current (apparent power) quote an accuracy of 5-10%.

Hope this helps give you an idea,

Glyn.

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