Multiplus-II Image

Multiplus-II

Force charge/discharge of Multiplus using VenusGX & Node-Red

What am I trying to achieve?

Charge the battery, or discharge the battery based on external input (via MQTT, but ultimately based on variable electricity tariff status)


I am up and running in Node-Red on the Venus GX 'large' image and am able to set the Multiplus to the following modes;

[image]

However if I set the multiplus to 'charger only' it obviously won't charge if I'm not in a scheduled charge slot.


If I set up a scheduled charge slot to be active at all times, then I can charge / not charge on demand by setting the 'Disable Charge' flag to either 0 or 1.

[image]

However when in the 'don't charge' state, it also won't discharge the battery as I'm in a scheduled charging slot.

I've tried setting the AC power setpoint instead of charging within a scheduled charging time, but it doesn't seem to do anything if I try the following;

[image]


Can anyone offer any recommendations on how I can switch between charging or discharging to meet my requirement?


homestorage-77 asked
russ commented ·

1 Answer

Help with using Node-Red with Venus GX

Could anyone please give me a bit of support in gettig started with Venus GX interfacing via Node-Red?


I've got Node-Red installed on a Raspberry Pi & am looking to switch on / off my Multiplus II based on certain input conditons.


I've loaded in the Victron nodes to Node-Red but am stuck on step 4 of the Installation Instructions;

https://github.com/victronenergy/node-red-contrib-victron#Installation-and-Usage


enable d-bus over tcp in your Venus device if you want to use dbus over TCP, otherwise skip this step. Edit /etc/dbus-1/system.confand add the following directly above <policy context="default">:

  <listen>tcp:host=0.0.0.0,port=78</listen>
  <auth>ANONYMOUS</auth>
  <allow_anonymous/>


How do I actually go about doing this? How to I connect to the Venus GX in a way that allows me to edit the files?


Any advice of next steps would be greatly appreciated too, as the instructions are not clear for me.


Many thanks in advance

homestorage-77 asked
Mark commented ·

1 Answer

Control MultiPlus II via MQTT

Would it be possible to control a MultiPlus II via MQTT ?

What I'm thinking is to disconnect the mains in relay off between 16:00 - 19:00 this would be because on the Octopus Agile tariff here in the UK is the very expensive period. During this period my house would run from batteries via the inverter in the MultiPlus II. The control would come from Node-red.

myozone asked
homestorage-77 commented ·

6 Answers

3 Posts
849 Users
23 Followers

Topic Experts

wkirby
1147 Points
Rob Duthie
455 Points