Alfen Eve Pro EV chargepoint interface via TCP modbus

bartland · June 6, 2022, 4:11pm

@hollie Interesting. The Audi E-tron simply resumes when the charger is set to more than 5A.

hollie · June 18, 2022, 8:06pm

FYI: no matter what I try as setting from the chargepoint I don’t succeed in suspending the charge process of the Volvo.

Every time the charge current is set to a value below 6A the car goes into failure mode after ±2…3 hours.

I tried the settings ‘0A’, ‘5A’, ‘5A with going to 6A for a short time every hour’ but nothing worked out.

So I took the other route: I now suspend the charging from the car side using the ‘charge location settings’ API from Volvo. This works as expected.

DelfuegoNL · June 22, 2022, 2:43pm

I am currently busy experimenting with my Alfen charger. However, I now have a problem. The connection keeps dropping. So every 5 to 10 minutes the communication stops for 1 to 2 minutes. Then it just continues again. Has anyone encountered this problem and how did you solve it?

hollie · June 22, 2022, 3:09pm

Hey Luuk,

are you sure that you communicate via TCP/IP modbus more frequently that the timeout you can set in the configuration software of the chargepoint?

And do you only have a single TCP/IP connection going to the chargepoint. As far s I know only a sinlge connection is allowed.

Those two things can have an impact on the stability of the connection.

Best regards,
Lieven.

DelfuegoNL · July 8, 2022, 9:43am

I solved the problem with the connection dropping out. It had to do with an experiment I did first to set up OCPP. Somehow the loader kept trying to connect to the OCPP server, despite the fact that I had cleared this info in the loader.

That said, don’t use the MyEve app for now. I have used it a few times, but it is an app that is not at all ready to use. I used the app because I have an Apple laptop and the ACE service installer only works on a Windows PC. Using the MyEve app has cost me a lot of time! With the ACE service installer, I was able to delete the wrong server information.

Everything works great now and I am load balancing using Home Assistant and Node Red! Thanks again Lieven for sharing this info.

Kind regards,

Luuk

Emacee · July 11, 2022, 8:22am

Would you please be so kind to share your Node-Red setup? I’m still struggling with Home Assistant changing the binary values to numeric values and thus the load balancing doesn’t work through Home Assistant and I can only read the values from the charger (halfway there haha )

Since I’m running Node-Red anyway that would be really helpful as a start.

DelfuegoNL · July 11, 2022, 10:22am

Hi Emacee,

I am happy to share my flow. Be aware that I calculate over 3 phases, so the flow may look overwelming at first glance. At the very end, I format the desired current to a format that the charger can understand.

I have added some comments. I hope those help a little.

Furthermore, I have now set it up that when using maximum solar, I send 100% of the Solar power that is left to the charger. I am looking at the phase with the highest solar current. On other phases it can be that I import power from the grid during solar operation.

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Hope this helps you get started and sorry for Dutch words in the flow every now and then!

Kind regards,

Luuk

DelfuegoNL · July 11, 2022, 10:25am

Hi Emacee,

Had to split the Flow because to many characters for this board!
Part 2:

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Kind regards,

Luuk

DelfuegoNL · July 11, 2022, 10:26am

Part 3

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Kind regards,

Luuk

Emacee · July 11, 2022, 7:12pm

Thanks a lot, works great for my instance too! I’m not using the solar part of the flow but setting the power limit on the charger works great!

DelfuegoNL · July 20, 2022, 1:48pm

Hi all,

Today I ran into a new problem. Active load balancing works perfectly through my Node Red flow in Home Assistant. However, if the permitted current for the car is set to maximum (in my case 16 A) and a large consumer in the house switches on (for example 15 A) then my load balancing flow nicely reduces the max current to a maximum of 10 A for the charger (connection max is 25 A). The only problem is that my car itself needs a little time to adjust to this. It has to reduce the current from 16 A to 10 A. But before it gets there, the EV charger already stops working because of over current. And it won’t start anymore because this over current is more than 150%. So I have to unplug the charger from my car and plug it in again to resume charging.

Anyone have any idea how to deal with/solve this?

Below from the Alfen Implementation Guide Smart_Charging (EN)

The charging station pauses the charging session in case the following situations of over current occur:
• 100% ≤ x < 105% after 1200 seconds
• 105% ≤ x < 112% after 100seconds
• 112% ≤ x < 120% after 5 seconds
• 120% ≤ x < 150% after 2 seconds

After 5 minutes the charging stations will resume the charging session. In case the over current occurs again the charging station will again pause the charging session for 5 minutes.

After this the charging station will resume the charging session once more. This cycle is repeated until the charging current is decreased (session stopped by user, fully charged EV battery) or the over current situation is resolved in another way.

Kind regards,

Luuk

Bob5 · July 21, 2022, 12:24pm

Hi @bartland. Great idea. Would you be so kind to share your code? Thanks!

MortuuS · July 21, 2022, 2:43pm

Hi Bartland,

I’m trying to enable the one time setting to be able to switch between 1 and 3 phase charging.
I found this guide which explains how to do it within ACE. However when I try to execute the command. All I get is the message: ‘incorrect password’? Although I am succesfully logged in with the ‘Owner’ account and password.

Any idea what I’m doing wrong?
Thanks!

antonclaeys · August 29, 2022, 8:40am

Is it possible to read the state of charge of the vehicle’s battery from the EVE charger’s modbus connection? I would like to be able to make Nodered flow which makes sure my SOC is at least 60% in the morning (and then keep charging on solar power during the day).

hollie · August 29, 2022, 6:47pm

Hey Anton,

no, that is not possible: the car does not communicate SOC to the chargepoint, this is not provided in the interface between the car and the charger…

Best regards,
Lieven

Matva · September 1, 2022, 7:43am

Quick question, my Alfen charging station is not managed by me but by my employer and a third-party backoffice.

I do have Owner access to the device using the ACE Service Installer tool and the MyEve app, and it appears that I also have the load balancing license (despite never asking, nor paying for this IIRC but whatever).

So obviously I’d like to get some data from the Alfen using modbus. But it seems that you can only enable modbus by also enabling Load Balancing. But here’s the thing, I don’t have a digital meter with a P1 port so there’s no data source for load balancing. Is this a problem? I don’t want to mess too much with any settings on a device that’s technically not mine.

hollie · September 1, 2022, 8:05am

Hey @Matva ,

no this is not a problem. I am not using the P1 port interface either, only the modbus interface. See the posts from December 2021 in this post for more details.

Best regards,
Lieven

Matva · September 1, 2022, 9:01am

Cool, I’ll give it a try. Thanks!

AHHA · September 18, 2022, 5:57pm

Any experience with using P1signal? My Alfen Eve is provided with load balancing (employer, also third party provider of my Alfen), by reading P1 into Iungo, that is transferred to my Alfen. I would like to send a fake signal to this Iungo from Home Assistant, so I use Home Assistant to do this calculation of overproduction of solar panels, then sending signal to Iungo to trick into loadbalancing (reduce charging power/speed) using solar produced power?

Macrisu · September 20, 2022, 6:23pm

I have an Alfen Dual Eve and it works great for Pv surplus EV charging with EVCC software.