EMMA 4G Compliance

EMMA 4G Compliance

The EMMA 4G is the newest addition to the EMMA family this unit has been in development for over 4 years with the older 3G unit used as a stepping stone in the 4G development.

The EMMA 4G has been independently tested by Compliance Engineering Ireland (CEI) in accordance with the standards we have agreed are correct with the UK DNO's such as SPEN and SSEPD. 

The EMMA 4G Power Throttle uses High Speed Pulse Width Modulation technology to produce a Pure Sine Wave output that varies in amplitude based on a control signal.

EMMA with Export Control DNO compliance testing

The EMMA 4G Power Throttle is part of our EMMA export control system which has been developed in collaboration with several large UK DNO's over during last five years. The initial concept was put together in October 2010 at the request of Mr Bill Halliwell of Electricity Northwest (then United Utilities). The aim was to provide a means of manging on-site load in a way that ensures that export from sites with grid-connected generators is limited to that permitted by the DNO... with absolute certainty.


This is achieved primarily by adjusting the amount of power sent to suitably sized resistive loads on site in a way that ensures that the difference between generator output and site load is always precisely the same as or less than, the permitted export limit. The resistive loads are typically comprised of a battery of 3kW immersion heaters in a buffer tank (or in-line heater) serving on-site loads including hot water, heating, dairy wash down, dairy sterilisatiion, drying (timber, grain, chicken droppings) and swimming pools.

The first challenge was to develop a control system that does this in a harmonics "free", seamlessly smooth (i.e. flicker free) way that ensures there are no associated power quality issues. We have worked very closely with Scottish Power Energy Networks (SPEN) and Scottish and Southern Energy Power Distribution (SSEPD) on this aspect of the design during the last two years... both in the field where many trial installations with generators ranging in size from c.10kW now going up to c.250kW (both PV and Wind Turbines) and export limits ranging from 0kW to 50kW were intensely monitored; and in the laboratory at Imperial College London where a number of EMMA units have been intensively tested on behalf of SSEPD. 

The second challenge was to make these devices "fail safe". This is achieved in two ways. The units themselves maintain a running real-time measurement of power exchange with the grid  i.e. import or export. This figure is compared with the permitted export limit every c.10 milliseconds and is used to generate a running 30 second average. In the event of this average exceeding the permitted limit by an agreed margin (typically 5 Amps per phase) for more than a permitted period (30 seconds) [this is required to cope with instantaneous variations when large site loads are switched off] the system isolates the generator by tripping the G59 isolator for an agreed minimum period. There are further protections built into the system such as powered on isolator control (i.e. the generator is isolated in the event of an internal PSU failing) and delayed start up (which ensures that the generator isn't connected before the 30 second running average is established).

The second "fail safe" protection consists of additional reverse flow G59 detection and isolation... which is normally used on sites with large RE generators i.e. above 100kW.

Compliance Documentation

Our compliance certs can be downloaded under the documents tab of this section.

EMMA Technical Compliance Document

This document contains all relevant testing carried out be CEI on the EMMA 4G System showing it comfortably meets the required standards.


Export Control Compliance Document for the DNO

The EMMA Export Control system was designed in consultation with several UK DNO’s. In the course of

this it became clear that there is a need for new test methods and procedures to cover issues of

concern to the UK DNO’s that are not addressed by current EU and UK standards. CoolPower Products

has collaborated with the DNO’s on the development and application of specially designed test

apparatus and related test procedures that address these issues of concern. In the course of this it has

been established to the satisfaction of the DNO that our 4G EMMA units meet all the requirements of

the DNO’s relating to these issues of concern.


4G Pass Harmonics @ 25% duty cycle

This document describes the compliance test results of the EMMA 4G Power Throttle at 25% power diversion. The unit demonstrates that it passes comfortably with bandwidth to cater for upt to 9kW of load without exceeding the harmonic threshold for any individual harmonic.


4G Pass Harmonics @ 50% duty cycle

This document describes the compliance test results of the EMMA 4G Power Throttle at 50% power diversion. The unit demonstrates that it passes comfortably with bandwidth to cater for upt to 9kW of load without exceeding the harmonic threshold for any individual harmonic.


4G Pass Harmonics @ 75% duty cycle

This document describes the compliance test results of the EMMA 4G Power Throttle at 75% power diversion. The unit demonstrates that it passes comfortably with bandwidth to cater for upt to 9kW of load without exceeding the harmonic threshold for any individual harmonic.

ELITE Control

The ELITE is the latest addition to the EMMA product family. While we consider it to be the Elite of power diversion and monitoring it is in fact EMMA's little sibling or as we call it EMMA lite.

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EMMA Cascade

The modular heating system that can grow and grow

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EMMA with Export Control

EMMA with EC allows for installs to have a greater renewable output than the Max Export Capacity (MEC) on site by diverting excess energy to heat.

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