Hi Robert, thanks very much for the reply. I really appreciate you taking the time to comment. I’ll answer your questions and add some additional info below.
I’m ok with having bought some additional CT’s since I was ordering from the UK I figured I’d have a couple of spares if they weren’t specifically needed in the first instance. I hadn’t asked prior to purchase because I hadn’t had a chance to understand how the wiring was setup in my meter box at that time. It was only at the time of first installation of the CT’s that I and my electrician could review the wiring setup.
Based on the diagram from my electrician it looks like both inverters are tied into a single feed. I’ll have to check with him for more technical info. Its seems like that feed is only offsetting a single phase which I imagine can’t be very effective since I’ll just be pulling power on the other two phases (and all three phases of the offpeak meter). I will need get him out to review the CT clamps for correct placement and directions.
Thanks for mentioning the a.c. adapters. I do have an a.c. adapter for each device - one for each emontx and one for the emonpi. I also have a USB power supply for the emonpi.
Regarding the 3-phase sketch, I specifically mentioned in my order that the two emontx devices would be used to monitor three phase power and requested that both devices be loaded with the required 3-phase configuration/sketch.
You are correct, I didn’t buy a programmer as I’m hoping they have been loaded with the correct 3-phase sketch. Is there a way to identify the type/version of the sketch contained on each emontx?
When viewing the Emoncms Inputs, I can see that I am reading data on the 3phase and 3phase2 node id’s (as well as the emonpi):
I was hoping that indicated that the emontx devices are configured with the 3phase sketches. Would this be correct?
Is there any configuration/calibration I need to do in the web interface such as describing what CT’s are being used?
Type 1 vs Type 2 Set-ups
Thanks for describing the differences between the Type 1 & Type 2 set-ups. If I understand it correctly, I’m definitely keen to use a Type 1 set-up as I would like to measure the actual use rather than derive it. This is due to having the two sets of three phase wiring (one for main use and one for the in slab heating) and I would like to be able to measure them separate to each other. I appreciate that I will need to sum the 6 inputs together to get the household [Total Use] for the My Solar graph, but I would like to also be able to sum the three in slab heating inputs to be able to better monitor the (very) high draw of that system. If I use a Type 2 set-up I could only derive the a single value [Total Use].
The in-slab heating is turned off at the moment so I’m not currently factoring that into my equations but will add it in when I have everything set up correctly.
Inputs and Feeds
It took a lot of reading of other posts to understand how to sum the three inputs together so hopefully I have it setup correctly.
I have the following processes setup on my Main 3-phase inputs:
Showing the powerL3 process list:
Currently I have the following Feeds configured:
My Solar App
Based on the feeds shown above, I have configured the following settings in the My Solar app:
On the day we installed the CT’s I had not had any experience yet with actually using Emoncms. I had looked at some youtube videos and lots of screenshots. When my electrician connected all the CT’s I was reading some negative values on some of the inputs. My electrician was confident that he had installed all the CT’s with the arrows pointing consistently in right direction but we were in a bit of a rush at the time. I assumed that all the values we were reading should be positive so I asked him to change the direction of some of the CT’s to ensure we had positive readings. As a result it’s possible that we have some of the CT’s currently clamped the wrong way around. I need to get my electrician to come out when we have more time and change them so they are all consistent. I feel this was my biggest rookie mistake.
As I was preparing this response I was browsing the Emoncms web interface and noticed the cog on the far right of each Input node id. I clicked on the cog icon for the 3phase node id and saw that a Device Template can be configured for each device. I had not previously assigned a template for each device but was using the default Input names that came with each device. If I assign device templates now, I assume that will reset the Input names and I’ll need to redo the input processes for the new inputs and recreate my Feeds with the new input names? It wouldn’t be a big deal if I had to do that. Are there any other configuration benefits to applying a device template other than creating default meaningful input names?
Thanks again for your input and knowledge, I hope the above makes some sort of sense.