Does the Gen 2 offer integration of two separate 200A panels for those of us with 400 Amp service?
I also have (2) 200 A panels–adjacent to one another. As we wait for this aggregate usage feature is the best hardware plan to install an Emporia Gen 2 in each panel? I have 10 or so circuits I would like to monitor in each.
While we wait for the Emporia data services to be improved to be able to combine multiple Vues into one logical presentation in the app, here’s a couple solutions. And if you don’t need more than 16 branch circuits of monitoring for the entire home, then one Vue would always be better than two in my opinion.
I’ve learned from Emporia that the Vue understands current sensor signals equal to 370 amps max, and that is a lot for even a 400 amp service so a single Vue can reasonably handle a 400 amp service.
If the wires feeding the separate 200a main breakers are right next to each other at some point and accessible, you can put a single CT (current transformer aka current sensor) around both wires of each of the hot legs, one CT on two L1 wires and ditto for L2). The standard CT is probably too small in diameter but the rope CT should be big enough.
BUT, if the two wires are not accessible where close together (like behind the meter) or the two together are too big for the CT hole, then the other solution is to wire two CTs in series with only one jack on the end. Here’s the steps to do that:
Get 4 CTs that will fit around your main conductors. (You can order an extra pair on the website, rope CTs are larger in diameter and smaller in profile and easier to get into tight spaces.)
Take 2 of the CTs
On CT1, you cut off the last couple inches and the jack.
On CT2, you remove a couple inches of the outer insulation a few inches away from the jack. (If your arrangement warrants making the connection more than a few inches from the jack, that is perfectly fine. For example, you are placing the Vue in one panel at the bottom a couple feet away from the main conductors.)
On CT2, you leave the red wire untouched but you cut the black wire and solder or wire nut it to the red wire of CT1.
Lastly you have two black wires unconnected so you solder or wire nut them together.
If you soldered, then heat shrink tubing covers your work nicely. Make sure that uninsulated soldered joints can’t touch each other, of course.
Now you have two main CTs, wired in series into one jack which plugs into the Vue’s A or B port like normal. And about seven feet or cable in between them. If you need a bit more (I have no idea how long before it becomes inaccurate), you could wire in an additional length of suitable two conductor wire.
Repeat the above with the other pair of CTs.
See the pic below (but don’t cut the red wire and have to resolder it too! 😉
I’ve also done this with two of the standard 3.5mm audio splitter adapters that I found at Walmart for $4 each. It’s no easier to modify t these into series, but it does leave the Vue CTs unaltered and seems more cool. This is the kind of product that a manufacturer could offer. The Vue jacks are TS (Tip, Sleeve) style and these splitters are TRS (Tip, Ring, Sleeve for stereo) style but it worked fine for me.
Remember that the pair of series CTs are placed on the same phase (one set is on the two wires of L1 and another series set on the two L2 wires). If one in the series is on one phase, and the other is on the other, they cancel each other out and yield inaccurate readings.
Hope this helps!
Do you know if this would work for combining total energy usage on two circuits of a sub panel?
Until we can combine, I have “SubPanel A” and “SubPanel B” since they recommend NOT using the multiplier and single sensor for sub panels. I’d love to just see the total use instead of having it broke out into A/B circuits. Would be great to know if anyone else has done this before I cut some of my 50A sensors.
- This reply was modified 1 year ago by theProcessor06.
Yes, you can put multiple CTs in series in order to sum up the same phase whether it be the wires feeding a panel, subpanel, branch circuit, etc. 50 amp sensors, 200 amp sensors, rope sensors – doesn’t matter.
A caveat is that a distance of let’s say more than 10 feet between the Vue and one or more of the CTs may give a lower reading due to the resistance in the CT wires. I suppose the Vue Multiplier feature could be used to adjust for this.
And sometimes (rarely) the two subpanels feeder wires are close together or can be moved a bit to be right next to each other at some point in the run and you can route both L1 wires (hot legs 1) through one CT and you don’t need to series multiple CTs together. This applies again to any size wires that will fit through the CTs.
And the CTs handle a lot more than the 50a and 200a stated current. Can’t remember what it is exactly but it’s at least 50% higher than the stated amps.
Is the feature to combine two units as one still in progress? I don’t see the ability to combine them in the app.
- You must be logged in to reply to this topic.