Feed processing - using virtual feeds in virtual feeds

Emoncms Emoncms.org
1

Hi All - first time poster so bear with me.

I have custom s/w running on ESP32 and send data to the cloud emoncms instance which is a fantastic resource. 27 data items updated every 30s or so, and have a heat pump app running (Emoncms - app view). But that app needs cumulative kwhr and I can’t see how that can be done in the cloud emoncms - or am I missing something ?

Additionally I create a virtual feed to compute thermal power (which is in the heatpump app view above) and I’d like to set the thermal power output to zero when the heatpump (LG ThermaV) compressor is off. The compressor frequency is sent to emoncms (e.g. in Emoncms embed - graph embed) so I can easily create a 1/0 value as a virtual feed. But I can’t use a virtual feed in another virtual feed’s processing. Is this something that cloud emoncms could support ?

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Hello @dyllysdad and welcome!

The input process to create cumulative kWh feeds is: Power to kWh:

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It’s not possible to create these feeds from virtual feeds. Can you transfer the processing from virtual feeds to input processing? I can take a look at your account if you like and see if I can figure out a solution?

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Many thanks Trystan. By all means you can dig into my setup, nothing secret in there :wink: If you need anything just let me know :slight_smile:

I’m trying to sort out a modbus integration for fellow LG owners and emoncms is great for visualising the nightmare compressor start-up problems :slight_smile: