Evance and EMMA put Loch Ness Winds in hot water.

New EMMA 3G harnessing monstrous Loch Ness winds for heating and water.


The latest version of EMMA – a new EMMA 3G Cascade unit – has been installed with 3 Evance wind turbines in Inverness on the banks of Loch Ness.

Customer feedback shortly after installation: 
“I am pleased to say that in the days since EMMA was installed it has been very windy and we have had some very hot baths without the need to burn oil.”

EMMA 3G helping to harness wind power at Loch Ness

Enviko are the installers who delivered this project in association with Evance Wind, alongside Cool Power Products.

The three EMMA 3G units are sending power to immersion heaters and storage radiators in three separate houses with three separate turbines.

Two Cylinders

The first install has EMMA sending power to two cylinders, using its Cascade capability:

  • EMMA acts as a normal EMMA unit while there is surplus power between 0 and 3kW from the Evance turbine, sending this power using the EMMA variable PWM output to one cylinder.
  • If the power exceeds 3kW from the turbine – which is a typical scenario on site – the EMMA ramps down power to the first cylinder and engages its SSR to send a straight 3kW to the second cylinder in the house.
  • Any excess above this 3kW is then sent to the first cylinder directly from EMMA using the variable PWM output again.

Evance wind turbine using EMMA 3G on the banks of Loch Ness.

The schematic below describes the installation and gives an indication of what can be achieved with EMMA Cascade:

This is the first Evance turbine using EMMA 3G to harness wind power for heating.


Cylinders and Storage Heaters

The other 2 EMMA units in Loch Ness have been used to heat water in a cylinder and switch over to heat a storage radiator once the cylinder has reached its temperature.

The Site makes use of Economy 7 electricity so, while still straightforward, this installation needed to have a little attention given to the positioning of the CTs and also to the switchover mechanism between the hotwater tank and the storage radiator.

This is easily achievable, as demonstrated in the schematic below, using standard components from electrical wholesale:

The extra components are a 230v Dual Pole Dual Throw relay meaning the power source can be either direct mains or EMMA to the cylinder or the Storage radiator.

Evance turbine using an EMMA at Inverness. Loch Ness is to the right of the photo.

The DPDT relay is power by a clamp on stat that is closed when the temperature of the cylinder is below the desired hot water temperature.

This keeps the relay engaged sending EMMA power to the cylinder and Economy 7 power to the Storage Rad.

Once the stat disengages the Relay switches over to its alternate poles, disengaging power to the cylinder entirely and switching from Economy 7 to EMMA power on the Storage Rad.

Clever simple applications

There are many more clever simple applications that can be achieved with EMMA using standard electrical equipment to help maximise the free power output from EMMA to heating devices.

On a side note the EMMA’s timer can be used to turn on the heat at any point (e.g. follow Economy 7 times) or by simply using the boost button if renewable heat is not sufficient.

EMMA 3G Cascade installed at Inverness. EMMA is at the bottom right of the photo.

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.


EMMA Cascade

The modular heating system that can grow and grow


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.