Help with varying Tesla charging Amps based on other entity states in Home Assistant

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shim99

104 posts

Master Geek

ID Verified

#306581 5-Aug-2023 11:33

Hey,

Looking for some help with an automation in homeassistant. We have a tesla that is able to charge at 16a but I would like to reduce that charge to 10a if the outside hotwater is also on. The hotwater is controlled by a shelly1 and we have the Tesla integration in homeassistant. I'm having trouble with the automation and wondering if anyone has pointers. What I have so far is:

alias: Reduce Amps Tesla
description: Reduces charge when outside hot water on
trigger:
- type: charging
platform: device
device_id: XXXX
entity_id: binary_sensor.pierre_charging
domain: binary_sensor
for:
hours: 0
minutes: 0
seconds: 5
condition:
- condition: device
type: is_on
device_id: YYYY
entity_id: switch.outside_hot_water
domain: switch
for:
hours: 0
minutes: 0
seconds: 2
action:
- condition: state
entity_id: number.pierre_charging_amps
attribute: "10"
state: ""
mode: single

I guess it could be that I need to set numeric state but not sure how the minimum and maximum works alongside the value template.

Any help greatly appreciated.

Thx.

DataBitz

37 posts

Geek

#3117967 19-Aug-2023 14:06

What does the trace look like?
Which step are you having trouble with?

I have something similar but with the condition action that the Tesla is charging.
Also I set the charging amp via the device action, I think that's what you need to change.

You may also want to add a condition to the automation, that the Tesla is at Home. So if your charging away from home the rate isn't changed.

- if:
- condition: state
entity_id: binary_sensor.tesla_charging
state: "on"
then:
- device_id: xxxxxxxxxxxxxx
domain: number
entity_id: number.tesla_charging_amps
type: set_value
value: 8
else: []

shim99

104 posts

Master Geek

ID Verified

#3117971 19-Aug-2023 14:58

That was really helpful guidance thanks, i've relooked at it and done a similar if/then/else statement that uses the status of the hot water. I've still done it as a time based trigger and it seems to be working well.

alias: Reduce Amps Tesla
description: Reduces charge when outside hot water on
trigger:
- platform: time
at: "22:58:00"
condition: []
action:
- if:
- condition: state
entity_id: switch.outside_hot_water
state: "on"
then:
- device_id: XXXX
domain: number
entity_id: number.pierre_charging_amps
type: set_value
value: 8
else:
- device_id: YYYY
domain: number
entity_id: number.pierre_charging_amps
type: set_value
value: 16
mode: single

DataBitz

37 posts

Geek

#3117999 19-Aug-2023 17:21

You should be able to use this trigger, so it starts when the switch is turned on.
Make sure your Shelly is set up to send events to Home Assistant (See Shelly CoIoT settings) though to help ensure it sees the state change quickly.

trigger:
- platform: state
entity_id:
- switch.outside_hot_water
to: "on"

shim99

104 posts

Master Geek

ID Verified

#3118017 19-Aug-2023 19:10

Thanks, the problem i have is that the feed to the switchboard that the charger, hotwater, laundry and powerpoints is on is only 25a. This is a garage circuit and I only turn the hotwater on when we have guests. So if I wait for the hotwater to come on there is a risk it blows the circuit (if hotwater, heater and dryer is going) before home assistant can step down the amps to the tesla. Under the current setup, I switch the hotwater on at 11pm and home assistant checks whether thats on and if so it will turn the charging down for the Tesla for the night (Tesla charging starts at 11.05pm). It will recheck again the next day.

Again appreciate the help.