Myenergi Eddi review

white and grey myenergi eddi unit on blue background

Myenergi are well known for their fantastic Zappi EV charge point but it’s not their first product, the Eddi solar diverter has that honour. The Eddi is an advancement of the Immersun diverter which was initially conceived by Myenergi founder Lee Sutton, at his previous company 4eco.

The Eddi is a device used as a way of diverting surplus energy from micro-generation systems, such as solar or wind turbines, and using it to heat hot water. This makes the micro-generation system as efficient and cost-effective as possible, instead of diverting surplus energy back to the grid at a low buy back rate it is instead consumed by the owner.

Eddi hot water heating

The most common use for the Eddi is to connect to an immersion heater for water heating.

The Eddi is usually wall-mounted next to the hot water cylinder, with up to two immersion heaters directly connected to the unit. These heaters work sequentially,  heating the one at the top of the cylinder first, as hot water is drawn from the top of the cylinder, this gives hot water quicker.

Once this heater is satisfied via its thermostat then the lower heater will be switched on heating the rest of the cylinder.

Other uses for the Eddi

Obviously, hot water heating only works for people with an existing hot water cylinder, for those that have a combi boiler then the Eddi can heat electric towel rails, underfloor heating systems or any other resistive heating element instead.

The Eddi can also be connected to heat pumps to help with legionella prevention. For this an added relay module is required.

For a full overview of Eddi uses, it’s recommended to download the Eddi instructions as there are various setup options explained.

Eddi, how it works!

The Eddi works similar to the Zappi EV charger in that CT clamps are installed to monitor the energy being imported and exported. One is installed at the meter to monitor the grid supply, and another at the circuit breaker for the PV array/wind turbines.

Once enough surplus energy is generated the Eddi will divert electricity to the immersion heaters instead of sent back to the grid. This is more cost-effective as the cost to purchase electricity from the grid is higher than the price that it will be brought back at via a feed-in tariff/smart export tariff.

If a Zappi is already installed then the CT clamps for the Eddi will not be required. This makes the Eddi installation a simple affair as energy monitoring information is already obtained via Zappi and transmitted wirelessly to the Eddi.

 

Myenergi hub connected to WiFi router via ethernet cable, installed in Shrewsbury

 

Priority control

The Eddi is also compatible with other Myenergi products such as the Hub and Harvi. This integration means that the Myenergi app can be used to fully control where surplus energy is consumed, prioritising either the Zappi, or the Eddi.

Setting the Zappi to priority means that surplus energy will go into charging an EV before it heats the water via an Eddi. Once the EV has enough charge then surplus electricity will automatically divert to the Eddi.

If a Zappi is already installed then the CT clamps for the Eddi will not be required. This makes the Eddi installation a simple affair as energy monitoring information is already obtained via Zappi and transmitted wirelessly to the Eddi. 

If surplus electricity is not being generated the Eddi can still be used as a conventional hot water timer. Timings can be set on the Eddi unit or via the Myenergi app, this enables overnight charging using a cheaper electricity tariff. A manual override switch is also on the Eddi unit.

Verdict

Another great product from Myenergi that integrates well with the other Myenergi products. Therefore helping make the most of your micro-generation system. The app makes the Eddi really simple to use, with the ability to change timings and priorities wherever you are in the world.

To find a Myenergi installer in your area then visit the Myenergi installer page here

See our Zappi Review for more information about the Eddi compatible EV charger