CT measurement

have a 6kw solar setup on 2 wires (ct1 and ct2)
when i connect emonTx wiht CT1 and CT2 i get this readings. (see graph)


What i dont get is that it start out OK, but after a while ct2 is falling in readings.
like it is invertet. Anybody seen this behavior before.

It follows the CT clamp, so if i switch 1 and 2 its still on the same CT clamp.

glyn.hudson's picture

Re: CT measurement

Try clipping on CT 2 to opposit way round. Are CT1 and CT2 measuring the same thing? 

Larsjo's picture

Re: CT measurement

 Found out it is releated to the fase I use for ac/ac voltage readings.

So if i dont use the voltage skech, and set the voltage to 230v it works.

So have to look into how the voltage reading is done, and at what time.


glyn.hudson's picture

Re: CT measurement

 Ah right, what do you mean by 'fase'?

S Bateman's picture

Re: CT measurement

 Phase ?


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