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Viewing 15 posts - 1 through 15 (of 71 total)
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  • djwakelee
    Member

    Definitely sounds like your Vue2 is defective.  Start a Chat with Emporia – they are very helpful and responsive that way.

    in reply to: Using two Vues at the same time #8206 Report Abuse
    djwakelee
    Member

    Sadly no.  There have not been any app or functionality enhancements regarding monitoring with multiple Vue2’s, nor better 240V circuit support.  Emporia’s focus seemed to be working on the EV car charger.  They also released a web site – in addition to the apps.  But all the functionality on the app remains fundamentally the same as it has been over the past 9 months ago.

    in reply to: 2 Vue 2 on the same panel #8204 Report Abuse
    djwakelee
    Member

    Can’t comment on the Android app, but yes you don’t use the main CTs (nothing on the A/B/C ports) if installing a 2nd Vue2 to monitor additional circuits.  You only use the mains CT ports on additional Vue2’s if they are being used in a subpanel.

    in reply to: Emporia no longer reporting after power blip #8194 Report Abuse
    djwakelee
    Member

    I had a similar problem where a power interruption (and restoral) resulted in no data updates (Vue2 seemingly offline).  I also have 2 Vue2’s, and only 1 was in this state – despite power cycling.  Turned out that the WiFi router needed to be rebooted.  There is some issues with NAT and port forwarding that the Vue2 seems to be unhappy about.  Perhaps this is worse for people with multiple Vue2’s.  So next time this happens – try powering down your all your Vue2’s, power down your WiFi router and re-power, then re-power the Vue2’s.

    • This reply was modified 2 weeks, 6 days ago by djwakelee.
    in reply to: Combine Main of multiple Vues #8193 Report Abuse
    djwakelee
    Member

    As currently implemented, Nesting is only appropriate for using the 2nd Vue2 with its mains clamps on a subpanel and its circuits.  When you want to want to just measure more than 16 circuits on the main panel, the present approach is to not nest – and not use a 2nd set of mains clamps (leave A/B/C unconnected on the 2nd Vue2).  In this configuration, your balance on Vue2 #1 will equal the sum of the circuits on Vue #2, and all the math will still work.  Any solar should be on Vue2 #1 (the one with the mains clamps).

    Emporia has promised updates to better handle multiple non-nested Vue2’s.  That and other features (like better 240V circuit support) seem to be continually postponed.

    in reply to: Solar inverter power consumption #8167 Report Abuse
    djwakelee
    Member

    This is a known issue.  Although the clamps are able to measure current flow either direction, currently Emporia is taking the absolute value of the current readings.  Loads are always shown as positive, and solar always negative.  The feature has been requested – vampire draw of the solar inverters is not taken into account as you note.

    in reply to: Usage not matching meter readings #8131 Report Abuse
    djwakelee
    Member

    Yes, for a split-phase setup where you’d use the A and B clamps over each 120V leg (like here in the US), it would expect those to be 180 degrees out of phase with each other.  And if 3-phase power, 120 degrees out of phase for each A/B/C clamp.

    in reply to: Usage not matching meter readings #8128 Report Abuse
    djwakelee
    Member

    The 200A clamps are for connection to single phase, split phase (aka 2-phase), and 3-phase mains (1-3 ports and clamps used depending on electrical service).  For the UK, you are 240V (50Hz) and single phase.  That would mean you would use a single 200A clamp for your combined mains power feed (before both meters).  You can’t use another 200A clamp (on the A/B/C ports) to measure a separate circuit, such as you are trying to do with heat and other loads.  That is where you would use the 1-16 ports and the 50A clamps.

    If you can’t place the single 200A clamp before the two meters (physically, etc), you can purchase a 3.5mm Y cable and combine (2) 200A clamps into the single A port.  That way you can get the combined reading for your domestic loads and heat, and clamp after those meters.  If you want to then know the individual power in each, that is where you would add the 50A clamps (connected to ports 1-16) and clamp those around the circuits you want to specifically monitor.

    After you make this change, you’ll probably want to re-setup the software as it is surely confused by seeing power on something other than the A port for a UK installation.  It is probably improperly assuming split-phase currently, if you are indeed using port B (which shouldn’t be being used for single phase).

    Hope that helps.

    • This reply was modified 1 month, 3 weeks ago by djwakelee.
    in reply to: Hardware idea: Vue Gen 2 with Ethernet #8112 Report Abuse
    djwakelee
    Member

    Agree this would be a welcome feature.  Note that this is typically not done on UL listed / NEC compliant energy monitoring products due to the fact they are designed to be placed inside the electrical panel.  Under a fault condition (such as chafed insulation in the Ethernet cabling, etc) a short circuit would electrify the lower voltage signalling circuits leaving the box – presenting a high voltage on the Ethernet cabling and end-device.  Because of such a scenario, it is generally not permissible by NEC to have low voltage wiring coexisting unchecked with AC mains voltage – and leaving the box.  Special physical partitioning is required to isolate the high and low voltage aspects, and this would not be present in a standard electrical panel.

    Some Ethernet energy monitors (like The-Energy-Detective) get around this by using power line communication and having the Ethernet gateway outside of the panel. But typical PLC challenges apply with that approach (interference, reliability).

    • This reply was modified 2 months ago by djwakelee.
    • This reply was modified 2 months ago by djwakelee.
    djwakelee
    Member

    For 3 phase, understand the Vue2 is only compatible with Y (Wye) type configuration with neutral.  If your 3 phase is Delta type or without neutral, it wouldn’t work properly.  The majority of people use the Vue2 with residential split phase 240V/120V in the US (and 240V single phase in other countries), in which case it correctly measures real power on all circuits.  3 phase commercial setups are not as popular, but are supposed to be supported if up to 415Y/240VAC Y type with nuetral.  Perhaps some other folks with that setup can chime in and report if they see in discrepancies in operation with 3 phase setups (as well as what country).

    You may want to verify your 3 phase hookup, and/or contact Emporia chat.  They don’t seem to monitor this forum as much as they used to.

    • This reply was modified 3 months, 2 weeks ago by djwakelee.
    djwakelee
    Member

    From Emporia chat…

    “we measure apparent and real power, and use real power on all circuits”

    The poster who theorized VA measurement on the 16 circuits did mention 3 phase – so maybe there is some bug there.  But with 120V/240V split phase in the US, I see accurate W (real power) for the 16 circuits and mains with mixed power factor loads – as confirmed by Emporia.

    djwakelee
    Member

    My experience is different.  I have all circuits monitored, and zero balance (or so).  At times there are plenty of inductive loads (AC compressor, pool pumps, forced air blower), which greatly exceed any 1.0 power factor devices.  The math always adds up with the individual circuits, balance, and mains – within that 2% tolerance.  If the circuits were only measuring apparent power (VA), things would be way off.

    The original Vue 1 only measured VA (apparent power), and was horribly inaccurate for non-resistive loads.  The Vue2 is spec’d to measure true power, and I have no reason to believe this is only on the mains.  My observations do not support that conclusion at all.

    Would like to hear from Emporia regarding this.

    in reply to: Total Usage A/B #8015 Report Abuse
    djwakelee
    Member

    In the amps view, you are seeing the total amps on each leg, but the circuits are not broken out per leg – just a big list.  So those shown can be on either leg.

    Know that the Amps feature is relatively new to the app, and has bugs.  It is also not really what it appears.  The Vue2 only sends real power to the cloud – the Amps values are just divided by an assumed 120V voltage.  Based on actual line voltage and type of load (resistive, capacitive, inductive), the reading may not match the actual amps flowing through the circuit (only if resistive load – and exactly 120V line voltage).  It also shows incorrect 2x current if you use a multiplier for single clamp 240V circuits.

    The Vue2 is an excellent and accurate power (W/kW) and energy meter (kWh), but presently missing things like real amps and power factor.  If you can switch to W view, that is how your energy company bills you, and that’s really where the device displays information correctly.

    • This reply was modified 3 months, 3 weeks ago by djwakelee.
    in reply to: Emporia Vue 2 showing 2x amperage #8010 Report Abuse
    djwakelee
    Member

    Known bug.  When you set a multiplier presently (such as single clamp 240V), the Amps reading is also doubled.

    Also, know that Amps value is presently manufactured – the Vue2 only sends real power to the cloud.  We don’t get to see real Amps draw – just the power divided by assumed 120V line voltage, which doesn’t take into account real/apparent power and phase angle for AC loads (resistive/capacitive/inductive).  So the Amps shown at present is not necessarily what you’d measure with a DVM clamp meter on that circuit.

    Emporia has promised an update handle 240V circuits better (and presumably fix this bug), but unknown when this is due now.

    • This reply was modified 3 months, 3 weeks ago by djwakelee.
    in reply to: Notifications by Peak Amp Draw #7988 Report Abuse
    djwakelee
    Member

    You can do this with the present notifications.  Add a new custom alert, and pick then ‘Mains’ circuit.  You can specify the kW you want to be notified of (can’t specify amps, but you can convert to kW).  So for your example of 65% for a 200A service, 200A x 240V = 48kW x 0.65 = 31.2kW.  You can spec an interval down to as low as 1 second.

    There is also a built-in notification alert for when you hit a peak for the month also.

    Also, you typically want to be looking at this in terms of power anyway.  The Vue2 is and energy/power meter (kW and kWh), and not really a good current meter (A).  Know that Emporia presently does not give you a true Amps value, it only records real power to the cloud.  The Amps value shown is manufactured – the true Amps value (with no relationship to power factor) is not shared.  This is a known limitation in their present implementation.  Requests have been made to indicate current (A), Apparent Power (VA), and power factor – but unclear if this will ever be implemented.

     

     

Viewing 15 posts - 1 through 15 (of 71 total)