Heat Pump Monitor Displayed feed options & differences

I’m a fairly new user of emonHP for monitoring my Vaillant 7kw ASHP using a Sontex heat meter and dual electricity meters (the emon HP standard kit).
Looking at other users ‘My heat pump’ displayed data, I see some have separate columns for space heating and DHW. Also some show shaded areas for DHW cycle in the data traces. I don’t think I’m able to do this but do not know why.
Is it:
a) My ASHP installation does not have the required data outputs?
b) Other users are not using emon HP but other hardware?
c) I have missed something when setting up my system?
d) Should I configure additional feeds and if so how do I do it?

I could do with a user guide to getting the best/most from emon HP but is one limited to what comes out of the box as standard plug and play? Apologies if this explained elsewhere in the community but I have searched and not found it.

Hello @FarnhamPete, good questions

  1. The standard emonHP kit of parts does not currently support breaking out DHW but it does provide everything else that you need for the dashboard of course. (c & d you have not missed anything).

  2. Some users are pulling in data either from a heat pump data interface itself, or by another means e.g monitoring the power consumption of the diverter valve to provide the flag required to indicate what mode the system is in. This can be supplemental to 1.

  3. We are working on making a CT option to clip around the power supply to the diverter valve a standard option available with the emonHP but it can also be retrofitted if you did want to add this in.

What monitoring equipement do you have at the moment? do you just have an emonHP setup or do you have any other OpenEnergyMonitor hardware?

See the thread here for more examples of how folk are doing this Separate DHW and Space heat monitoring - #76 by John

Thanks Trystan,
I would be interested in the CT option to monitor the diverter valve power. However I could provide a two state signal from a small mains relay wired in parallel with my diverter valve. I’d need guidance on how to get this signal into emon cms.

Currently I have the standard emonHP kit i.e. Sontex heat meter and the two electrical power meters on the heat pump power and control supplies. I have a simple open system with no hydraulic separation and the single pump in the Vaillant 7kw heat pump (one zone radiators only).
I am porting room temperature and site outside temperatures across to emoncms from Home Assistant Zigbee sensors via the edited HA config.yml file. I would like to be able to display both the the site and Metoffice outside temperatures for comparison but seem to only be able to have one? I also have a spare channel of a Shelly EM, monitoring the total heat pump power just because I can. It’s a useful comparison. The primary Shelly channel monitors power taken by a Daikin small aircon system.

Thanks for the link to the [Separate DHW and Space heat monitoring ] thread. I had missed that it is providing me with lots of answers and possible options.

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Related to the subjects of:
Separate space heating and DHW monitoring (have looked at all the posts I found).
Adding additional inputs to emonHP.

Q1. Can an emonTH talk to emonHP to add additional temperature inputs or do I need a separate base or receiver?
Q2. How can I monitor a contact closure (e.g. relay in parallel with diverter valve) to identify DHW mode? Could emonTH see this?
Any other recommendations.?

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Yes it can as long as the emonHP has the RFM69-SPI module installed (looks like this in the case New: emonBase with RFM69 SPI (Direct) — OpenEnergyMonitor 0.0.1 documentation). If you don’t have that we can supply it alongside the emonTH.

It’s not something the emonTH can do out of the box with standard firmware, but in theory the pulse counting input on the emonTH could be repurposed to read a volts free output. As long as that relay is volts free (not switched 240V) and that you can supply 3.3V and have it switch that as an output. That would be quite neat and would be worth us investigating I think.