The new Opportunity Loads feature in 3.80 is very beneficial. Am looking for a solution to turn on the spare relay 2 in Ekrano GX to activate a DC load when excess solar power is available. e.g. Is there a way to trigger Ekrano Relay 2 to ON when excess solar power is available? (12V DC system with a Multiplus 12|1200|50, Ekrano GX).

Thanks. Here’s what I missed: Manage Palette - Install node-red-contrib-s2 version 0.9.6 update from last week. And the docs needed are here: node-red-contrib-s2 (node) - Node-RED

Yes, use the new S2 nodered module (resource node)and send the ombc control signal to the relay (using a suitable function or node to convert the payload to the right format). I do this currently with a virtual switch but it could be any switching device or relay.

Thanks @Nick - that will get me started. Do I need to have a power-meter device or can I fake that (known load)?

Fake it til you make it :wink: Going to shuffle this to nodered land.

There are examples included with the S2 resource node for guidance. This is a screenshot of mine showing the interactions, functions are pretty much just checking for bad data and converting the source into a payload the target node expects. In my case I am using a Tuya device for data and the target of a virtual switch. The resource node needs to be sent the device power and and a state acknowledgement when it requests and on/off - though you can skip this and enable a default, automatic ack in the resource node control itself. [Screenshot 2026-09-29 at 07.39.16]

You have to see, how that goes. Depending on the load size and available solar it will for sure start at one point, but internal maths won’t really work out, as OL currently only supports ACLoads, as the underlying S2 Standard only supports that by now. (Our CR to add a Commodity DC is already submitted :wink:)

I spent a bit of time digging around in Node-RED on 3.81, and didn’t find it - so I had a look at the documentation slides, and it mentions that Node-RED palette support for Opportunity Loads is a future item. So I guess I’ll just play with a Shelly smart plug and see how it goes.

It exists already, there is a dedicated topic in this category for it. Custom nodes also allow direct access for many parameters that do not have an existing dedicated node.

[image] GX Opportunity Loads and Node-RED Node-RED The 3.80 release of Venus brings us Opportunity Loads. Which is an awesome way to make maximum use of the PV power (by activating extra loads, ev charging, etc). Now the initial release within Venus “only” supports our battery, EV charger and Shelly devices. Node-RED users of course want more, and preferably in an easy and user friendly way. In this post I am going to explain a bit on how to accomplish just that. [image] It is good to know that under the hood, Opportunity Loads, communicates…

Glad you got it sorted, Buzzy! The S2 module is really handy for this kind of excess-solar switching — thanks for sharing the solution.

Opportunity loads - DC load or relay activation

Node-RED

nickdb (Nick) 12 October 2026 14:32 10

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Opportunity loads - DC load or relay activation

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