I have a hot water boiler with Modbus connected to Domoticz: a lua script, available at https://github.com/CreasolTech/domoticz_lua_scripts, sets the hot water setpoint according to the hour of day (enabling boiler in the warmest hours of the day) and power availability from the solar photovoltaic (increasing setpoint temperature in case of photovoltaic overproduction or overvoltage).
Also, I've used the DomBus37 module to:
* read the inlet, outlet and mixed water temperatures, by using common NTC 10k sensors
* read two alarm sensors
* read hotwater flow meter (maybe in the future I can compute the thermal power and energy, because I know the flow, in and out temperature)
* read the hotwater electrical power and energy consumption (DDS238-2 energy meter with pulsed output)
* read the washmachine power and energy consumption (DDS238-2 energy meter with pulsed output)
* monitor 230V presence (to detect blackout and send alert: all DomBus modules in the house, switches, routers, raspberry, ... are supplied by a 13.6V power supply + lead acid backup battery, so they works even in case of power outage).
* the INAC1 input, connected to 230V, also works as zero-crossing detector, permitting to activate relays minimizing the inrush current (goods for all capacitive loads), and disable relays minimizing overvoltage (in case of inductive loads).
* 10A relay output is used to enable power supply to energy meter (that consumes about 1W) and hotwater boiler (that consumes 3W in standby): in this way I can enable boiler power supply only when needed (few hours during the day) and I can manually disable power supply during storms.
* 5A relay output used to automatically turn ON the light in the room in nighttime, when the door contact sensor detects opening the door, but this is managed by another script and beyond the scope of this post.
Below the result from the flow sensor
and the electric energy consumption
HotWater heatpump boiler control: flow meter, energy meter, energy saving, ...
Moderator: leecollings
- psubiaco
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- Joined: Monday 20 August 2018 9:38
- Target OS: Raspberry Pi / ODroid
- Domoticz version: Beta
- Location: Italy
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HotWater heatpump boiler control: flow meter, energy meter, energy saving, ...
Paolo
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I use DomBus modules to charge EV car, get a full alarm system, control heat pump, fire alarm detection, lights and much more. Video
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I use DomBus modules to charge EV car, get a full alarm system, control heat pump, fire alarm detection, lights and much more. Video
Facebook page - Youtube channel
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