Optimizing use of unused Solar Power to charge a Tesla

swainstm · April 11, 2023, 3:26am

Yes, https://chargehq.net/ is going to be a good fit for some people. If you happen to have the right hardware to support it, it can be a good way forward without some of the complextity of HA.

I would like them to support a cheap generic power meter with no ongoing monthly cost such as the Iammeter so there is a solution for everyone that decouples the need for specific solar inverter or battery support. But they are close with support of SolarAnalytics and Wattwatchers (not that I have any experiece of Wattwatchers). But both of these look like they depend on online services with some sort of ongoing fee (or up front cost for these services) which is less than ideal for me. I have suggested Iammeter support to both parties, but no trackion on this as far as I know.

The other issue in the future with ChargeHQ is they have yet to establish a commericail business model to fund it that i know about. So it would not be surprising if there is a charge coming to users at some stage, though I believe it is free for the moment.

But having said this, I suspect its advantage over HA is that it is probably much easier to setup for the non technical if they happen to have the right bit of kit that is supported by ChargeHQ. But I suspect not much will compete with HA if you want full control to do whatever you want and full integration with all sorts of other things that are more likely to be supported through HA long before they are supported in propriety bespoke platforms. This is the real power of HA to act as a broken between lots of otherwise not integrated platforms.

broodro0ster · April 14, 2023, 12:18pm

I invested in solar panels and I’m now looking to Tesla a new car. I was looking on how to charge my car with solar via HA, but then I came across EVCC. It can be installed as an addon for Home Assistant and it looks really promising. Might be worth it to give it a try if you haven’t got a solution yet.

hmadsen · April 22, 2023, 7:49am

Looks promising from their website, but i was unable to find the addon, for home assistant, both in official supported, and HACS sections.

Where and how would i go about installing it as an addon for Home Assistant?

broodro0ster · April 22, 2023, 8:08am

hmadsen · April 22, 2023, 12:20pm

Thank you.

Tried this but i am not clever enough to even get past the first steps apparantly

Did as the manual says, and it apparantly added the evcc, i can see it in the “three dots - Repository” menu with a red trashcan besides it.

But when i close the window and go back to repositories and search it does not find the EVCC one anyway.

Did try to restart, but it is still not there.

Using latest version of Home Assistant OS (HAOS) installed on a RaspberryPi 4

broodro0ster · April 22, 2023, 12:58pm

You need to a hard refresh to see the new addons after adding a repo. Shift+F5 should do it if you’re on the addon page

hmadsen · April 22, 2023, 1:31pm

Thank you that worked.

Now comes the hard part, it seems that all setup is done inside the evcc.yaml i created.

When i start the evcc it offcourse complains about missing stuff. I found the documentation and found the section for Growatt, but it seems it expects a RS-485 connection to the inverter. I already have solar assistant connected via RS-232 .

Is it not possible to setup the system to use the sensors i have already integrated into Home Assistant ?

For the battery i have a sensor called “sensor.battery_state_of_charge”

For the hose usage i have a sensor called “Load power” (This is current combined consumption)

For the solar panels i have a sensor called “PV power” that shows how much solar the solar panels are producing right now.

With those sensor i believe the calculation on how much power the charger is allowed too draw should be possible to calculate.

These sensors are updated every 2 seconds

I also have a max usage of 3700 Watts as this is how much my solar inverter is able to deliver to the grid, that needs to be set. This is what the system should try to (just) stay under, when charging.

InventoCasa · April 22, 2023, 1:38pm

Another option would be to use my blueprint/script for PV excess automation. That should work for your Tesla (or wallbox) too.
See https://community.home-assistant.io/t/pv-solar-excess-optimizer-auto-control-appliances-wallbox-dish-washer-heatpump-based-on-excess-solar-power/

broodro0ster · April 22, 2023, 4:47pm

You could use the HTTP component in EVCC and call the Home Assistant API to get the sensor data.
I haven’t tried this yet, but I use the HTTP component for my WiFi P1 meter

hmadsen · April 22, 2023, 7:05pm

So there is no way i can just feed it a home assistant sensor and let it use that directly, i need to have it call the actual Solar Assistant Raspberry to get the data ?

broodro0ster · April 23, 2023, 10:49am

No, because it’s not a Home Assistant integration. Is just a Docker container that you can load via the add-on store, but it has no direct connection with the Home Assistant sensors.

If you use modbus there is probably a 1 device limitation. To get around that you can setup the Modbus proxy addon. That addon will make the connection to the inverter and then the other services will send their requests via the addon over that same modbus connection.

hmadsen · April 23, 2023, 11:21am

Fair enough, i think i will find another solution then, i wanted something that integrated into Home Assistant, not another standalone solution.

But thanks for the tip.

torstein · April 27, 2023, 10:38am

this is mine, GitHub - torsteinelv/NodeRed-Excess-charging-flow: Charge EV from excess solar

123childre · May 22, 2023, 7:03pm

I am currently using “switch on Tesla charger when Powerwalls are above 99%” which seems to work well.
However , i cant get it to switch off again when Powerwall drops to 90%. i had it working last year, so not sure whats happening differently now.

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.