Venus OS script for controlling house heating system

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mihair asked Apr 18, '19

Venus OS script for controlling house heating system

Hi guys,

I would like to implement a Venus OS script for controlling house air-to-water heat pump (HP) based on the following conditions:

HP ON when (Battery SOC >= 60%) AND (Battery temperature <= 22 grd C) AND (More than 5 minutes PV Yield >= 1000W)

HP OFF when: (Battery SOC <= 40%) OR (Battery temperature >= 25 grd C) OR (More than 5 minutes PV Yield <= 100W)

For starting and stopping the HP, besides using the room thermostat and remote SMS control system, I will use a supplementary relay controlled by Venus OS running on RPI. My ESS and house heating system topology is depicted below.

Any hint is well appreciated.

Kind regards,

Mihai

Venus OS

voinesti-ess.png (427.0 KiB)

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Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Dominik Immler commented · Aug 30, 2022 at 11:09 AM

Hello mihair.

What program do you use to make graphics like the one above (voinesti-ess.png).

Thanks

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Modifications Space

Node Red Space

Answer 1 · 2019-04-18T10:09:35Z

mvader (Victron Energy) answered · Apr 18, 2019 at 10:09 AM

Nice. Check-out our node-red work.

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mihair commented · Apr 18, 2019 at 10:16 AM

Hi @mvader (Victron Energy Staff)

Thank you for your quick response. When we will see node-red implemented in a stable Venus OS version?

Sorry but I don't wanna put experimental software on production system ...

Thanks,

Mihai

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mvader (Victron Energy) ♦♦ mihair commented · Apr 18, 2019 at 10:17 AM

I understand

But when, I don’t know yet; sorry.

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mihair mvader (Victron Energy) ♦♦ commented · Apr 18, 2019 at 10:19 AM

Besides using mqtt and node-red, there is no other way?

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mvader (Victron Energy) ♦♦ mihair commented · Apr 18, 2019 at 10:21 AM

there are; making a shell script, or Python, or C-code, or modifying some existing open source component. But thats all requiring quite more serious software development skills than node-red.

And perhaps it can be done with relays and Assistants as well; but I can't help with that.

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mihair mvader (Victron Energy) ♦♦ commented · Apr 18, 2019 at 10:31 AM

One more question, please.

It is very tempting for me to run a developer version of Venus OS with Node-Red support in it and then implement house automation using MQTT. May sound silly but can I consider that using a developer version of Venus OS all the old features already implemented into stable version will work flawlessly in developer version of OS?

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mvader (Victron Energy) ♦♦ mihair commented · Apr 18, 2019 at 10:34 AM

I'll rebuild a node-red version in the coming weeks; based on the latest v2.30 build.

v2.30 is quite stable now.

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mihair mvader (Victron Energy) ♦♦ commented · Apr 18, 2019 at 10:40 AM

Great news!

Thank you so much!

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