Integrate Daikin altherma 3 into Victron ESS

DIY
, , ,
1

Hello

I have a 3 phase Victron Dynamically steered ESS Multiplus II 3 kVA x 3 with 15 kWh battery.
I recently had a Daikin Altherma 3 HT installed (with hot water tank).
I was thinking of buying a Daikin HomeHub, adding the capacity for Victron to set the hot water tank temperatury based on solar overproduction.

Questions:

  1. Would this be worth the cost/effort?
  2. Or should I just let DESS based on forecasts do its job and use the static settings on the heat pump?
  3. If yes to Q1 and no to Q2: does anybody have experience sending commands over Modbus to Daikin HomeHub? I think I can get an installer to install the device, but the communication between victron ESS and Daikin heatpump I will have to take care of myself.

Thank you for your insights.
Best
Johan, Belgium

2

The altherma should have smart grid contacts, which you can maybe drive from the cerbo.

Using these contacts you can have the heat pup either

  • forced off
  • forced on
  • recommended on
  • normal operation.

Check the installer manual for details.

3

Thank you. I will try to find more information about these smart grid contacts.

4

I have Viessmann HP and made control using onboard contactors.
https://communityarchive.victronenergy.com/articles/303827/viessmann-heat-pump-smart-grid-control-with-cerbo.html

I think Daikin has something similar