Variable charging speed

[maart84]

First of all: thank you for this plugin!

I just received the 2021.36 firmware in my car so now I can change the charging speed from the app Tesla app (and the api). I thought others might like it as well. If you call the service like this from the developer tool in Home Assistant you can change the charging speed:

service: tesla_custom.api
data:
  command: CHARGING_AMPS
  parameters:
    path_vars:
      vehicle_id: 'xxxxxxx'
    charging_amps: '5'

Now the next challenge is to make a nice script or blueprint to change this speed based on solar over-production so we can fill the car with only solar power.

[purcell-lab]

Now the next challenge is to make a nice script or blueprint to change this speed based on solar over-production so we can fill the car with only solar power.

I have setup a script to run every minute during charging that sets charging_amps to a desired value.

https://community.home-assistant.io/t/optimizing-use-of-unused-solar-power-to-charge-a-tesla/340818/12?u=markpurcell

[ideal2545]

This is awesome, I came to actually post about a variable charging speed to match with solar overproduction, this is awesome!

[MicheleMercuri]

Now the next challenge is to make a nice script or blueprint to change this speed based on solar over-production so we can fill the car with only solar power.

I have setup a script to run every minute during charging that sets charging_amps to a desired value.

https://community.home-assistant.io/t/optimizing-use-of-unused-solar-power-to-charge-a-tesla/340818/12?u=markpurcell

with nodered :) (function node):

// I get power values from photovoltaic sensors, wallbox, power from grid, and to grid power.
var power1 = global.get('homeassistant.homeAssistant.states["sensor.input_power"].state');  // pv plant power
var power2 = global.get('homeassistant.homeAssistant.states["sensor.wallbox_em_channel_1_power"].state'); // wallbox power
var power3 = global.get('homeassistant.homeAssistant.states["sensor.active_power"].state'); // inverter power
var power4 = global.get('homeassistant.homeAssistant.states["sensor.pv_to_grid_kwp"].state');  // power to grid
var power8 = global.get('homeassistant.homeAssistant.states["sensor.power_grid_kwp"].state'); //power from grid

let w1 = parseFloat(power1);
let w2 = parseFloat(power2);
let w3 = parseFloat(power3);
let w4 = parseFloat(power4);
let w8 = parseFloat(power8);

// now calculate the sum of the powers to have the net available from photovoltaic.
let y = w1 + w2 - w3 + w4 - w8;

// acquire the current voltage data, which will be used for the power calculation by multiplying it by the amperes
var power5 = global.get('homeassistant.homeAssistant.states["sensor.wallbox_em_channel_2_voltage"].state'); //current internal grid voltage
let w5 = parseFloat(power5);

// I obtain the maximum settable amperage, which depends by the wallbox or by Tesla charger.
var ampmax = global.get('homeassistant.homeAssistant.states["number.model3_charging_amps"].attributes.max');
let maxamp = parseFloat(ampmax);
// amp minim
var ampmin = global.get('homeassistant.homeAssistant.states["number.model3_charging_amps"].attributes.min');
let minamp = parseFloat(ampmin);

let x = 1; // I start the sequence ampere with x = 1 to find the value to set in amperes for the Tesla.

while (x * w5 < y) {
    x++;
}

if (x * w5 > y) {
    x--; // I continue the calculation until it exceeds y, and then I decrease x by one unit
}

if (x > maxamp) {
    x = maxamp; // I ensure that the maximum value of x is less than the allowed maximum amperage
}

if (x < minamp) {
    x = minamp; // I make sure that the minimum value of x is not less than the allowed minimum amperage
}

msg.payload = x; // I set the value of x as the payload of the message and pass it to the next node to send it to the Tesla.
return msg;