MyEnergi - Zappi / Eddi / Harvi

Third party integrations
42

I’ve only just set this integration up - however I was wondering how / if anyone has added their Zappi to the Energy Dashboard?

I’ve looked at adding it as an individual device, however I’m a bit unsure about which sensor to use for displaying how much energy was used/consumed when charging the EV.

I’m currently using the ‘myenergi zappi-00000000 Energy used today’ sensor (00000000 being my serial number), but I’m not sure if this is correct - given that I assume this value would reset?

43

Hi @MattFirs

I use the same sensor and it works fine. The energy dashboard knows how to deal with energy sensors which reset on a daily basis.

1 Like
44

Yep, that seems to work just fine! Thanks for confirming!

45

Hi
Is it possible to set the charge rate with this system?
I have a Zappi (series 1) that I got to work quite well with a Victron/LG Resu system.
I’ve moved house, LG batteries got recalled and are now set up with DC coupled batteries.
I’m looking to try to get the original Zappi ECO functionality without the ability to measure the DC solar output with a CT.
I’ve seen the instructions on how to not get the Zappi to discharge the battery, but would like the ability to charge the car direct from solar before charging the home battery.

Thanks
Jon

46

@Jon_B67 from what you have written you need to be able to stop the batteries from charging, then the excess solar will be exported to the grid then the zappi will pick it up and divert it to the car. Can you control the batteries?

47

Not from what I know at the moment (which isn’t much, getting it installed today)

Would it be practicable to;

  1. Have a maximum charge requested API data point
  2. Read the PWM from the car
  3. Produce a PWM based on the lower of 1 or 2

I know that would need a change to the PCB as the PWM would need seperate pins for the car side and Zappi side

48

Hi @Jon_B67

  1. Yes in theory if the battery can operate like that.
  2. Yes my board GitHub - donoghdb/local-zappi shows you how to read (sniff in my case) a PWM CP line from an EVSE.
  3. Yes this is possible, I created a simple PWM EVSE ±12 V circuit to test no 2.

You should look at this DIY Arduino Based EV Charger Saves Money, Looks Pro | Hackaday to understand the EVSE signal.

49

Thank you

I think I might try to combine your project with a CP line interceptor/transmitter to allow a priority charge of the EV over the battery.