I would like to get this up and running. But before I buy, a few questions ;). I have a server on all the time that I can run the software and post to over Wi-Fi. I believe I will require emonTx, with Wi-Fi card and power via usb.
Can someone confirm and advise what cables I should clamp for best results
What are the Henley Blocks bottom right? One pair of cables goes to the consumer unit we can see, another pair goes upwards. There’s something else going on out of the picture.
Is that what we call a Generation Meter? Does that imply you have P.V. and an inverter?
If yes, do you want to use an optical pulse detector on the generation meter (if it has a flashing LED), do you want to measure current directly, or do you want/can you get its readings in some other way? The difference is, the LED gives you generated energy accurately, but it’s ‘historic’ - you only know the energy, and can infer average power, after the event, whereas measuring power with a c.t. is less accurate, but the data from both c.t’s is essentially synchronised, so doing maths on both (e.g. deriving a sum or a difference, and accumulating power to give energy) is easy.
That is simple - as John wrote, it’s the right-most cable coming out of your main meter. Or if it’s easier, the brown cable going into the bottom of the Henley Block.
Is the SDM 120A your generation meter? If it is, then the cable for the second c.t. is the cable from the ‘Line’ Henley Block (the left-hand one) that goes from there into that consumer unit - the one containing the generation meter.
If it’s easier, you can of course put the c.t. on the equivalent Neutral cable. If you do, it must face in the opposite direction.
Having put your c.t’s on those cables, you will have, in OEM terms, a “Type 2” installation. CT1 is the one below the Henley Block, CT2 is the one above it.