To get it working you also need a twin and earth cable from the ASHP immersion heater output to go into the e-sense port on the Eddi.
If you have 2 x 2 core cables you “could” use one for the smart grid relay and one for the immersion port as you will not be pulling any current through it and you only need a live and neutral for the e-sense. The actual power is pulled from the Eddie’s main power input.
That would allow it to work with full smart grid and immersion from the madoka.
Can i jump in here Zak?
I’m just researching this as we install heat pumps but this will be the first time we have included a solar diverter.
The solar guy is just going to rock up with one and I presume will expect us to fit it.
So I have read through this and can you confirm i have my understanding right.
So, you have the immersion wired to the eddi.
the heat pump triggers the immersion my wiring the immersion control to the eddi on the external trigger, i get that. So when the disinfection cycle hits, the heatpump asks the eddi for the immersion and turns it off when it completes.
moving on to the excess solar…
so
the eddi senses the excess solar and activates the smart grid interface.
the heatpump receives the signal and starts heating the water via the air to water.
the heat pump has ob-115 meter installed on the incoming tails and is aware of the excess that is available.
the heat pump modulates to keep its operation within the excess.
correct so far?
now for questions.
what happens when the water stored water temp reached 45 degrees, or what ever you have set for the setpoint, does it cease to heat further? or can it be configured to bring the immersion in?
my thinking is that the hotter the water (60 odd degrees) the more thermal mass we have saved?
or is this where the eddi comes in, will the heat pump bring the immersion in? will the heat pump shut down because the stored water is at 45 degrees, the eddi see a large excess now and bring the immersion on its self and increase the water temp? and does the madoka/MMI ever get in a pissy if the water temp is rising without it being commanded to?
alot of questions, but all valid i believe.
Many thanks
Hey Daniel,
I can’t remember the setting off hand and am out of the country for a few days but the dhw had a setting allowing it to overheat and buffer a little. Also if the ASHP stops the Eddi can and will take over providing the settings on the Eddi allow it to heat that hot.
You also need an immersion with an adjustable stat on the back (usually red knob). This allows you to set a max temp cut out and not have a scalding hot tank of water one warm Thursday afternoon.
Your other assumptions are correct. Have you seen the Google docs and do you have any other questions let me know.
Zak
awesomely quick reply there Zak.
you continue your holiday. i’m going to have a think and a ponder. i may even draw up a wiring diagram to check its correct.
speak soon