Fronius Relais for PV Ready Heat Pump

Configuration
1

Hi!

Does anyone know if the Fronius integration also receives info on the usage of the PINs?

I want to trigger a relais which then triggers a PV ready water heat pump and would like to know whether I’ll get some feedback on when it’s on/off. See https://fronius.com/~/downloads/Solar%20Energy/Whitepaper/SE_WP_Connecting_a_heat_pump_to_the_Fronius_energy_management_system_DE.pdf

If this does not work, I’d rather use some esp relais to trigger the heat pump.

I’m installing the system in september but would like to know this now - so I can plan a bit.

Thanks

2

Not via Fronius’ SolarAPI (Json API) which the Fronius integration uses. Maybe via Modbus - see the according documentation.
I have a similar setup and connected the Fronius pins to a Knx binary sensor to transport the signal via KNX to a different location. Works flawlessly.

1 Like
3

Thanks for you reply.

Does the usage of pins make any difference in comparison of just triggering a relais via HA when there is x% more energy provided then used?

4

There are some configuration options in the Fronius UI that are tailored especially for these things (at least on Symo SnapInverter devices, don’t know about Gen24).

  • Priority system for multiple loads
  • different turn-on and turn-off triggers (when a load is turned on your %-more-than-used will drop)
  • minimum runtime per cycle
  • maximum runtime per day
  • target runtime (minimum) per day until configurable time

So nothing you couldn’t do in one or more HA automations, but I personally like to keep this as an independent system (apart from the KNX stuff I’m running, but this is decentralized in itself).

For “x% more energy provided then used” you will have to install a Fronius Smartmeter (~200€).

5

I’ll install the smart meter anyway as I want to track the power consumption from grid. Beside that, I get the parts pretty cheap as I own a electrical appliances wholesale. :wink:

Is you KNX sendor just a sensor or is it also the relais?
I’m thinking about putting an ESP with GPIO binary sensor in parallel to the relais.

6

Its just a sensor. It has to work with the 10,7V the Inverter provides on its Out-Pins.
I think I used this: https://new.abb.com/products/de/2CDG110093R0011/be-s8-230-2-1 - the actuator (relais) is in a different part of the house. KNX was already there when I installed the inverter so I used it as transport instead of pulling new cables.

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Since I don’t want to add KNX, I guess I’ll use an ESP with it’s GPIO pins, adding some resistors to decrease volts (voltage divider) down to 3.3v.
I can also trigger a relais via esp then.

Thanks for your support.