Just in case you are interested... I created a custom meter for evcc based on the local REST API (/api/monitorjson), see here.
Question on the monitorjson... Is there a reason why currents are not signed?
Hi Daniel,
Yes, the current value is not signed; only the power value is signed.
That's fantastic!
We truly appreciate your efforts in helping more people learn about IAMMETER.
Best regards,
Laoliu
As a token of appreciation for your work, we would like to send you a small gift.
We’re wondering if you have a resistive load heater at home. If so, we would love to send you a set of our latest WPC3700as a thank-you gift.
I have now created two templates for evcc
- iammeter-1p (WEM3080)
- iammeter-3p (WEM3080T/WEM3046T/WEM3050T)
I can't test the single phase meter. So is it correct that the data field in monitorjson is called Datas for 3phase meters and Data for the 1phase meter as suggested on this page?
It will soon be pushed to the evcc repo.
I created a new common template for IAMMETER now, see here. It automatically detects the number of phases based on the availability of either Datas or Data, handling all IAMMETER meters now (WEM3080/WEM3080T/WEM3046T/WEM3050T).
Thanks but unfortunately I cannot make use of such a device. I use a heat pump for heating and water which is digitally integrated with the PV system, effectively using the excess energy.
OK. If you’re interested in any IAMMETER products, please let me know.
By the way, could you share how your heat pump works with your solar system?
Also, what is the current self-use rate of your solar site?
We are gathering ideas to help customers make better use of solar surplus, whether or not it relates to our products.
All devices (PV system, meter, heatpump, EV wallbox) are connected via Ethernet. evcc is the central hub. It collects the feed-in power from the meter and if there is enough excess power it tells the heat pump to heat/overheat the water or the electric vehicle to charge. evcc supports several protocols like Modbus (TCP), EEBUS or OCPP for wallboxes. It can also switch simple relays (like the Shelly).
In case of the heat pump it is basically just an on/off switch (like a relay). In case of the wallbox, evcc can drive the current based on how much excess power is available (and also how cheap the electric price from the grid is in case of dynamic prices).
"In case of the heat pump it is basically just an on/off switch (like a relay)."
If in this way ,does it mean the heat pump can only controlled on or off?
If so ,it means the heat pump can only work on the rating power or not work, yes?
It is basically a relay input. It can be triggered via dry contact or via protocol over Ethernet. If there is enough excess power available (a threshold has to be specified), the input will be triggered and water will be heated. If there is still enough excess power available after water has been heated, rooms will be overheated by a specified offset.
IAMMETER integration has been accepted into evcc, see PR.
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