EKM-Omnimeter II UL v.3 – Universal Smart Meter, Single Phase or 3-Phase, 120 to 240V, 50/60Hz, up to 5000 Amps

I want to use this to monitor a single phase 240v NEMA L6-30R outlet (hot, hot, ground). Do I need to connect a neutral wire to the meter or can I connect just the two 120v hots to this meter?

If you only have 2 hot wires and no neutral wire, you can still use this meter.  This is similar to how electrical systems are in Europe and other parts of the world.  For this system you will need a meter and only one Current Transformer.  Your system is a 2-wre system, you will connect yours like this.

Is this meter ANSI certified?

The Omnimeter II v.3 UL is not ANSI C12.1 or ANSI C12.20 tested and certified.  Only our Omnimeter Pulse UL v.4 is ANSI C12.1 or ANSI C12.20 tested and certified.

Can you read the meter without a computer?

Yes. These meters can alway be read on their LCD screen. The last page of the meter's spec sheet shows the 15 data points that the screen cycles through.

I want to monitor 1 - 240 Volt Appliance so 1 CT on each Hot Wire (Phase) In addition i want to monitor another - 120 Circuit( On one of phase already used above. So can i use 3 CTs or should only use 2 and combine load of 2 wires on same Phase.

If you want to aggregate the Total kWh from both loads then you can use one meter for this. You can either pass multiple wires through a CT (provided that they are on the same phase), or you can use two CTs for the same phase, that both run their leads to the same ports on the meter. So you can either aggregate the current from multiple wires in one CT, or you can aggregate the current from two CTs for the same phase.

If you want the kWh values of both loads to be separate then you will need to use two meters.

A follow up to the question about multiple circuits on one meter. This is a 3 phase panel, 120/208. I will only meter 120v circuits, no 208. I have not seen how the bars run behind the 120v breakers. I imagine they are divided between all 3 legs. I could easily make it so each apartment (and meter) are on only 2 of 3 legs. But it looks like the pulse v.4 would be able to meter a unit with circuits on all 3 phases as described in last question. Correct?

Yes, the Omnimeter will also meter 3 phase systems. And similar to the example in the previous question, you can pass multiple wires through the CTs for each phase. It is important that the wires are indeed on the same and correct phase or the Omnimeter won't be accurate.

I want to meter after a panel with single 120v 20 amp breakers. Each unit will have 5 breakers. Can I run all 5 circuits with one meter?

If you want to aggregate the kWh usage for each unit into a single value then this should be no problem with one meter. You can pass multiple wires through a current transformer, provided that each wire is on the same phase. So for example, if the system is 120/240v single phase (2 hot, 1 neutral), and you have 2 circuits on one phase and 3 circuits on the other phase, you would pass the first 2 wires through one CT and the other 3 wires through the second CT. Both CTs would then be connected to the same meter.

If, however, you want to keep the circuits separated and have a kWh for each, then you would need to use 2 of our v.4 Omnimeters, as these meters provide kWh on each line as well as an aggregated total. So you would be able to connect up to three 120v lines to each of these meters, each line with their own CT.

Can we connect only two phase with this meter and then calculate KWh?

Yes, this meter will work on systems from single phase to three phase. For the system that you've described it sounds like you would have two current transformers, two voltage references (for each phase), and a neutral reference. The meter will provide a Total kWh value with no calculation or multiplier needed.

* Use 1 CT for single phase 2-wire systems (one hot and one neutral, with or without ground).  
* Use 2 CTs for a 120/240V three-wire system (two hots and a neutral, with or without ground).
* Use 2 CTs for 3-phase 3-wire systems.  (without neutral, up to 415V)
* Use 3 CTs for 3-phase 4-wire systems. (with neutral, up to 480V)

Do you offer a model that works on 277/480 3 phase 4 wire system?

Yes. The Omnimeter I v.3 and Omnimeter Pulse v.4 can both be used on 277/480v 3-phase 4-wire electrical systems. Technically any of the Omnimeters would work, however, the Omnimeter II UL v.3 and the Omnimeter Pulse UL v.4 would not retain their UL Listed certification as this only applies up to 240v.

What exactly comes with the unit?

Only the meter itself is part of this product listing. This meter does need to be paired with one or more Current Transformers (CTs) in order to operate. The CTs are sold separately so that you can select the correct quantity, amperage rating, diameter, and solid core or split core, for you particular application. All other Accessories, Enclosures, and Meter Reading Solutions are sold separately.

From the picture the wiring looks pretty small. Will the amp probes go around #3 copper? Also, it shows the lines spliced to feed the meter. Would a separate circuit breaker work instead, as the wiring cannot be spliced?

We carry a wide range of Current Transformers (CTs, or amp probes as you call them) for diameters and amperages up to 180mm and 5000 amps. So we can definitely help you find CTs for #3 wires. The image that you’re referring to is somewhat diagrammatic and shows one way to connect the essential elements of the metering system. In reality there are many ways that it could be set up. For example, the voltage reference wires that are spliced in the image could instead be connected at the breaker or main lug, instead of spliced in the middle of a wire. The meter simply needs to be able to sample the voltage from the correct phase.

Do you have a meter that will allow more than 4 CTs? I have a multi unit rental property with a shared electric meter.

The Omnimeter II UL v.3 will only return one kWh value.  There are scenarios where you can use more than 4 CTs, but this is still to only meter one load or tenant space.  If you have multiple units in your rental property, you will need one submeter for each unit.  But if you are going to connect these meters to the internet you can use just a single EKM Push gateway.  The EKM Push2 gateway can read up to 50 EKM Omnimeters, and the EKM Push3 can read an unlimited number of EKM Omnimeters.

Which watertight enclosure do I need to house this Monitor?

Either of our watertight Enclosures will work for the EKM-Omnimeter II UL v.3 model.

Can I use this on a 3 phase panel, 120/240?

Thanks for the inquiry. Yes, this meter is designed to work on a 3 phase 120/240 system. You will need 3 of our current transformers. More details here.

What is the price for this meter?

Thanks for your inquiry. This meter has its pricing schedule listed here. Note that these meters will need additional items in order to use them. See more info here.

Any of your meters support LoRaWAN technology? if so, please recommend some 3phase energy meters for a solar farm

We do not have any meter models that support LoRaWAN directly, but you could use something like a LoRaWAN pulse counter to gather the pulses from our electric, water, or gas meters that would make the pulse count data available via LoRa.  A device could also be programmed to read our meters and then make the data available over LoRaWAN.

We have looked into using LoRa in the past, but the recommended data rates per day (amounting to only about 10 or 12 meter reads per day) are so small, that they have limited application in our experience.  We like our wireless 485Bees as a better alternative to LoRa, because they have quite long range, they create a mesh network, they work with our Push system, they transmit all meter data (not just kWh for example), and you can have unlimited data per day transmitted between them.  Of this list of advantages, LoRa only has long range.

We do like the looks of LoRa, but in the end we have found our 485Bees to be a better solution.