Forum Replies Created
October 10, 2021 at 9:22 am in reply to: Real vs Apparent vs Reactive Power & why things dont add up in the app #8043 Report Abuse
yep – 3 phase power in my readings & results.
Not much more i can dig into or do – I look at the App & it says 300W (100W x 3), i check the equipment it says next to nothing.. the mains say next to nothing… My grid cancelling inverters that use CT’s (2 different models) both say next to nothing.
So thats test equipment, the equipment manufacturer (300W load), 2 different inverters, the view mains CT all giving the same results… then the Vue load CTs giving different results…October 4, 2021 at 11:53 pm in reply to: Real vs Apparent vs Reactive Power & why things dont add up in the app #8021 Report Abuse
yes i’m 100% positive – i went & purchased the instrumentation to test it.
The test equipment is a few hundred $, it taps the voltage on each of the 3 phases and clamps each phase as required, and shows active/reactive power on each phase.
The circuits I was testing had 300W of pure reactive power. The emporia was measuring “300W” on the sub circuits, but “20W” on the mains side with a balance of “-280W”, this corresponded to the test equipment and also the meter on the grid.
Thinking of the internal hardware, it would be hard to detect & setup 16 ports and check the phase angles & check them all.
(sorry – hit send early.)
But the main side CT”s & overall system is incredibly close to what I get billed by the energy supplier, last time i checked it was <3% difference to the fully certified/calibrated meters the energy providers use.
Its just the individual circuits that will vary depending on the active/reactive power.
In terms of the balance – read this one: https://community.emporiaenergy.com/topic/real-vs-apparent-vs-reactive-power-why-things-dont-add-up-in-the-app/
Do some searching on how RCD’s work – basically its about balance.
The current in/out of the live/positive lead must be identical to the current out/in of the neutral/negative line. If they’re not balanced the RCD will trip.
Black & white must be on the same RCD, the others may need to be elsewhere (depending on the current – they may/may not trip, they may also make that circuit trip early).
Do you have a photo of the setup? wires in/out of the RCDs?
I hope thats clear?
Your RCD’s are probably like ours in Aus… the RCD has Live & Neutral IN at the top – then Live & Neutral OUT at the bottom, you need to make sure you connect the black & white to the OUT on that single RCD.
The others should sit on the neutral out also.
OK – i’m based in Australia & seeing as we both speak the Queens English i can help!
You need to make sure the power & neutral are BOTH on that same breaker. What is happening is that the Vue is drawing its power via the positive from that RCD, BUT its flowing back via another RCD. So that RCD assumes its hitting earth & tripping.
Black is POWER for the Vue unit, connect that to the positive output of the RCD.
White is NEUTRAL for the Vue unit, you MUST connect that to the neutral output of the SAME RCD. If you put it anywhere else – it’ll trip
Then she’ll be right.
I think its good that we push Emporia to deliver value, if they dont deliver value & its easier & better for us to look at other options like openenergymonitor dot org, then we will!
The cost & ability of the emporia hardware is unbeatable, and of course they get our data to play with & make money – they just need to keep developing features for us!April 7, 2021 at 1:04 am in reply to: Emporia limiting minute data to 3 day starting march 1st #7240 Report Abuse
+1 to this.
I understand the cost of storing data etc, but having a small SD Card or local webserver on the unit is an easy thing to implement & store some data locally.
4Mb storage would store a HEAP of per second data & cost a few c
Local storage & access on the units please 🙂
When doing the install make sure you’re consuming a decent (1kw) of power also – turn on an aircon unit etc.
That helps increase the signal-noise ratio on the sensors & fixed a few setup issues around here.
Which port was faulty? It wasnt port7 by any chance?
I had the same issue with faulty port – but just ended up using another port as i had quite a few spare.
Also when setting up – make sure you have a large amount of usage on your sensors.
Turn off your solar & put a kettle on – make sure there’s at least 1kw in use on each power phase.
That fixed a few issues on here with setting up & direction. Without usage it may mis-interpret the direction of flow.
It doesnt look like its covered above – just to clarify i’m seeing an issue here.
I have a 240v setup, the Watts are showing perfectly but the amps are showing double the actual value.
My pool pump is 500W (240v) which is ~2A, when i change the units of measurement to A, its showing 4.22 – and all circuits have a multiplier of 1.
Its as if the Amps measurement assumes 110v & isnt looking at the line voltage.
and finally found where you can get extra CT’s from… Emporia shop! Quite hard to find..