It would be worth finding this out. I suspect it’s the software that’s “dumbed down” the output to avoid confusing the standard customer who doesn’t understand three phase (or any?) systems. If you look here at others who have implemented monitoring of their inverter, there’s a lot more data available. But you need a map of where to look, i.e. the memory registers to query to extract the data.
Ah, I see. So in effect, that wall is the box labelled “Fusebox/consumer unit” where the two infeeds come together to install the c.t’s.
The PV infeed must have some protection - most likely MCBs and possibly an RCD as well, and I would have expected those to be inside the house and part of the main distribution board. If local rules allow, and if there’s space, the c.t’s could go inside that, with the Emon units adjacent. However, your electrician knows what’s there and what’s legal in Italy, I don’t.
Correct. (No need for one on the neutral.)
It could be. The standard YHDC 100 A c.t. is good for a 13 mm diameter round cable (100 A).
Without the fiddle of extending cables, this is all correct.
No, I meant is the output of the PV Inverter balanced? If it is, you only need to measure one current - saving two c.t’s and quite possibly one emonTx.
(Equally, if you use the RS485 data, you don’t monitor the inverter with an emonTx at all.)
I have second-hand experience of that. A friend carefully logged the moisture content of the fuel for his wood-chip central heating on the calendar in the kitchen, and a couple of days into New Year, it disappeared.
All I can suggest you do is turn off a phase at a time and see what doesn’t work, and from there work down to individual breakers/fuses/circuits. I did that for the same friend, now in a different house, only a month or two ago (but UK single phase, a lot simpler).
Alternatively, when you’ve got your emonCMS up and running, there’s a good chance that by looking at the graphs, how much and when the power changed will give you a clue as to what’s on which phase. But looking inside the distribution board is a lot simpler.
You need two a.c. adapters, one per emonTx, unless they also share the same 5 V USB supply.
Yes, 3 must be on different phases for the a.c. adapters. Which phase the (genuine) power supplies are on doesn’t matter. Local regulations will determine spacing. In the UK, it’s adequate if they are clearly labelled with the phase numbers/colours, and there’s a notice that they must only be used for a specific purpose (the OEM monitor). Otherwise, phases must be separated by (I think) 2 m. and it’s recommended that different phases are in different rooms. If the sockets are in a lockable weatherproof cabinet that houses only the monitoring equipment, I’d say that’s good enough as only authorised and skilled persons have access.
However, one 5 V USB power supply should be adequate for the 3 emonTx’s.
If you do go for the 3 × emonTx option, I’d suggest looking at getting 3 of the devices mentioned here Emon TX V3 capabilities - #16 by bruce_miranda (and posts below) to get the data straight onto your LAN, which would neatly get around the problem of 3 emonTx’s transmitting at the same time on the same frequency (and jamming each other). It’s not “plug and play” however - maybe something to bounce off your electrician?
I have mentioned that many times in the past. It has fallen on deaf ears.
There has been some development - at a snail’s pace and presently stalled. There’s a post only today, but it gives no indication of anything in the future.
I have no knowledge of Shelly, my concern would be, do you have access to the developers and support to the extent you have here?