The Emlite twin element meter can be used for monitoring self-consumption of energy generation

Product code: EMC1.w  Download the datasheet

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The twin element meter operates as two separate meters in one for independent measurement of energy consumption and energy generation.  The meter has 2 measuring elements, element A measures energy generation which can be used for claiming feed-in-tariff payments, and element B to measure energy import and exported to the grid.  This makes it possible to establish how much of the PV generation has been used by the customer and how much has been exported.

Meter readings are collected automatically via the Openmetrics web portal using the integrated GPRS communications module and network roaming SIM.

Two metering circuits for independent measurement of energy consumption and energy generation

One advantage of this type of metering is that it encourages consumers to change their habits to use energy when its available from solar generation, or other renewable energy source.  Consumers benefit from a lower unit cost when using energy from the secondary source of generation instead of pulling from the grid.

The meter display shows calculated net consumption to show how much energy has been ‘purchased’ from the source of energy generation.

The second element can alternatively be used for controlling a 100A heating load through a rated breaker activated by a time-of-use switching matrix programmed to the meter. The switching matrix allows for day-of-week and seasonal switching with 50 time-of-use rates available.

Download the datasheet

Typical Dual Element Meter Arrangement for Domestic PPA Metering

Scroll down to see a more detailed description for wiring the twin element meter


What is a Power Purchase Agreement?

PPA stands for Purchase Power Agreement.  PPAs are contracts to sell energy generated from one party to another.  Domestic PPA agreements sell energy generation from a solar installation to the energy user.  The terms of the agreement set out the cost of energy purchased from the renewable energy source which is always less than the cost of energy from the grid.

Can the Twin Element meter be used for non-PPA metering?

Yes, the meter can be used in place of an ordinary generation meter for claiming FIT payments. This provides the added benefit of monitoring energy import/export and how much of the energy generation is being used.   This makes it possible for the energy user to change their habits to utilise all the energy being generated that would otherwise be exported to the grid as surplus.

Openmetrics Automatic Meter Reading

Openmetrics provides automatic meter reading for twin element meters

Service features

  • Daily meter reading with half-hour profile for import/export and generation readings
  • Calculated energy expenditure using dual tariffs for each meter element (Purchase Power Agreements)
  • Flexible charting tools for analysing historic energy generation and energy consumption
  • Automatic email notification for threshold alerts and solar system outages
  • Integrated GPRS communications module with multi-network roaming SIM cards
Wiring Diagram

Element A is measures the energy imported from or exported to the grid.  Energy drawn from the grid is taken from the supply cable connected to terminal 4 (L2) and supplied to the home through terminal 1 (L)

Element B is used to measure the generation from the solar installation.  Energy is received from the inverter through the cable connected to terminal 5 (L1) and supplied to the domestic load through terminal 1.  Alternatively if there is excess generation, energy will be put back onto the grid through terminal 4 and the internal connection to element A.  Element A records this export energy as described above.

The meter is configured to show the total generation and signal strength of the communications module on the display.

twin element diagram cropped