Optimizing use of unused Solar Power to charge a Tesla

MicheleMercuri · June 28, 2023, 4:22pm

I writed this nodered flow (I’ve bought a Model 3 last week) maybe it need a debug because I’m a newbie :

when I start charging My Tesla M3, Nodered Ask me by Telegram if I want to charge Tesla by maximize self PV consumption or a manual charge
if answer is “yes” then a function node calculates unused PV power (Inverter output power + PV power to grid)
So if residual PV power is between a range interval es. 230W-460W a node set 2A tesla sensor “number.charging_amps”
nodered wait until unused PW power is over than 230W or under 230W to repeat cycle and set a smaller or greater Ampere value in sensor “number.charging_amps”
on sunset Nodered turn off the flow, same as Tesla’s Battery is 100% charged
a check on Tesla’s charge = on avoid nodered loop to set Ampere uselessly

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CommanderROR · September 16, 2023, 9:01pm

I can’t really help with node red since I use HA Automations to achieve the same. My charging automation is working pretty perfectly, I do have some problems with it not being triggered though because the “Charger Plugged in” status isn’t recognised properly when the car is asleep. Need to find a way to wake it before the status is checked…

MicheleMercuri · September 17, 2023, 9:24am

try use “switch.charger” sensor, in nodered I’ve no problem.

CommanderROR · September 17, 2023, 10:24am

I will try.

ulfjohansson · September 23, 2023, 11:10pm

I seem to be having similar problems. I’ve used the automations and script by @swainstm as a base for my configuration and it seems to run well when the car is awake. However, I noticed this morning that the charging switch did not activate because my Tesla was asleep. Did you figure out a way to force the car to wake via HA?

CommanderROR · September 24, 2023, 6:44am

Sadly not really. If I send a wake-up call to the car before running the Automation to check if it’s ready, then that wakes up the car too frequently and needlessly. For now I will just have to do this the old fashioned way and start the process manually. Not ideal, but workable for now, especially since solar excess is growing sparser as autumn approaches.

jmcollin · October 7, 2023, 5:08pm

Hi, I have a custom integration exactly for this purpose and more. See here: GitHub - jmcollin78/solar_optimizer: The Solar Optimizer integration for Home Assistant starts and stops your equipments depending on the Solar net production

With this you can adjust the charge amp of your Tesla depending on your solar exceeded production. This integration does more than this: you can switch / on / off any equipments.

Kano1177 · October 31, 2023, 9:32am

Long time stalker of this thread, first time poster. I have been using a frankestein HA solution for charging my Model Y on excess solar based on @CommanderROR and @swainstm above posts. Firstly, a big thank you, with zero coding experience and far more hours that was reasonable, I have had a functioning program running well for the last 5 months.

My wife just purchased a Model 3 and the thought of modifing my working automations/scripts to add the ability to charge either of our Teslas has me paralysed.

Has anyone walked this path and have any guidance? Thanks in advance

arwooldridge · April 1, 2024, 8:30pm

Anyone got a good algorithm for EV charging power (Ev) depending on PV input power, (Pv) and battery percent, let’s call it (B) as a ratio ( most batteries won’t go down to zero, so make B zero for battery minimum), and other loads (L)
I first thought to use Ev=BPv-L. It should be simple enough to solve for L knowing the total load (Lt) from last Lt=EV+L. For use in Home assistant. So if B =0, battery gets priority and if B=1, EV gets priority.
This all assumes there is no feedin involved ie F=0.
PS to avoid confusion the B in my equation refers to PV hybrid battery state not The EV battery state.
After a bit of tweaking with a spreadsheet I found that EV=B(Pv-Lt/2) works quite well without overshoot or oscillation. The factor of two was intuitive but seems to give the right answer, although might need fine tuning.
Just need to test out on HA automation.

markpurcell · April 1, 2024, 9:31pm

I have a template helper which I utilise to calculate the relevant charging_amps:

excess_solar_charging_amps

{{max(0,(states('sensor.home_energy_gateway_solar_power')|int(0) 
+ states('input_number.servicecall_grid_services_power')|int(0)
+ state_attr('sensor.charger_power','charger_amps_actual')|float(0)
* state_attr('sensor.charger_power','charger_volts')|float(0) 
- states('sensor.home_energy_gateway_load_power')|int(0))
/230)|round(1)
}}

Which sets the value in the car via a script:

alias: Tesla Solar
sequence:
  - service: tesla_custom.api
    data:
      command: CHARGING_AMPS
      parameters:
        path_vars:
          vehicle_id: "{{ state_attr('binary_sensor.online', 'id') }}"
        charging_amps: "{{ states('sensor.excess_solar_charging_amps')|int(0) }}"
mode: single

bremby · April 6, 2024, 7:10am

Hi @fhopley can you share some details on your dashboard?

askpete · May 15, 2024, 1:13am

I have been using my own node red flow to manage charging for a year or so. It’s extra complicated because I have wholesale pricing for import and feedin that wildly fluctuates from negative through multiple $ per kw (via Amber in Australia). Probably too specific to be useful to others, but it lets me set a max price and it decides to charge the car from grid when the price is very low and conversely not charge thte car and insexport to the grid when the feedin tarif is high.

Has anyone else started getting errors when trying to set the max amps below 5 for a Tesla Model3? I get errors in homeassistant and the Tesla App widget now bottoms out at 5.

juergenjw · May 15, 2024, 1:21pm

My Model 3 is just charging at 2A. I’m using the TeslaFi custom integration, installed via HACS.

askpete · May 16, 2024, 1:13am

Thanks! Turns out the official app doesn’t let you go below 5A in the UI but still works via api.

After a huge amount of faffing about I was just suffering from the deprecation of the Owner API. If anyone else faces this you have to either setup the fleet API (which looks like a real PITA) or use a third party service like teslafi, tessie, or the one I went for teslemetry.com. Teslemetry is the cheapest and setup was very straight forward.

juergenjw · May 18, 2024, 4:40pm

As i already wrote above, i’m using the teslafi custom integration, which allows setting the current to 1A as minimum. Does somebody know if it is possible to set the current to 0A via the Tesla-Api to pause charging without switching off the charger?

mhoogenbosch · May 18, 2024, 5:29pm

Haven’t actually tried it but I can set the charging amp to 0 with Tessie integration

juergenjw · May 18, 2024, 5:53pm

Thank you, i will give it a try tomorrow and modify the integration.

markpurcell · May 23, 2024, 9:51am

I find setting to 0 A stops all power flow with the mobile connector (UMC), but with the wall connector (TWC) I still get about 400 W power draw.

I find reducing the charging limit below the current state of charge does stop the power flow with all connectors.

juergenjw · May 23, 2024, 10:19am

I’m using a Go-eCharger and when setting charging amp to 0A in the car, the charger show current drawn from the car is still 60W. I think that is acceptable.

merkurmaniac · May 29, 2024, 6:15pm

Do you have a post on home assistant discussing your solar optimizer ?