I am hoping for a few pointers on what OpenEnergyMonitor (OEM) devices to get to cover my set-up.
The property (all single phase) has a 2x6kWh PV array (KACO inverters), running into the switchboard of the house.
The 240V cable then runs form the house into the shed.
Here it is connected to an inverter/charger that has a 20kWh battery connected to it.
This inverter/charger (a Selectronic SP PRO GO) is connected to the grid. (In fact the only thing connected to the grid; it feeds all consumers on the property, and limits the export to 5kW/h).
I’d like to measure in real-time what energy is generated, imported and consumed.
I reckon I need
- two CTs, one per inverter to record generation (connected to what OEM hardware? or, do I measure what goes inot the house, which is the generation = one location less to physically monitor.)
- one CT for house consumption (and as per the point above, comes from the PV array)
- one CT to measure the grid (import and export; positive or negative values?!)
- one CT to measure what goes in/out of the battery (this is DC up to 200A at 56V)
- one CT to measure what goes into the the shed
Writing this down, and I figured I have two physical locations to measure it all.
That is house for PV in, House to shed, house consumption (=3 CTs)
And shed for grid import/export, battery in/out, shed consumption
If the DC part for the battery requires “more effort” in gear and cost, I already capture the battery in/out (as in V and A) via a battery monitor connected to opeHAB (which I heavily use for automation; ATM more for pump, tank and irrigation automation than for home automation. Sensors are all based on Arduino UNO with Ethernet shield and MQTT).
I would like to connect the emonTX(s) or emonPi(s) via wired Ethernet (otherwise wireless; not 433MHz due to distances/obstacles to cover). There is Ethernet wired everywhere on the the property.
What are you using to measure individual 240V consumers? emonXXX? sOnOff/Tasmota/MQTT.
In essence: what OEM to buy for my set-up?
Or building my own? (which I could, but I am time-poor)
As for geography: the PV is 40m from one side of the house, the shed is 40m from the other side of the house, the grid is 40m from the shed (all lined up like a string of pearls). A significant green house is planned, which could connect to the PV system switchboard. (I would opt for another “OEM sensor” to measure what goes into the greenhouse when the time comes).
Thanks in advance for reading this far, and even better for providing some input.