Lab Update #96: Open Source V2G over CCS

[@DalasEVRepair]

Amazing work Johannes! 🙌

[@EngineersFear]

Many thanks!

[@keyem4504]

That is awesome. Never thought that we would have an Open source DC charger. Incredible.

[@sydneyg007]

Well done Johannes. You've done a lot of work to get to this point and it's great that you are sharing it with everyone else!

[@EngineersFear]

Thanks :)

[@flyingtools]

Wow! Im super impressed!!! Thank you so much for sharing👍🏻

[@EngineersFear]

Good to see you here 👍 love your videos

[@flyingtools]

@ Happy to be here 😃 Thanks ☺️

[@jurgenkrause8225]

Super! Das ist ja Wahnsinn! Vielen Dank für die Arbeit.

[@evsolar]

This is awesome! Much needed and invaluable work. Thank you for sharing! ❤

[@flipschwipp6572]

Next type of OpenInverter will be Solar Inverters. Huge potential for improved firmware there

[@EngineersFear]

That'd be cool. With REST API for all communication, none of that stupid modbus crap

[@pxidr]

Does the CCS standard authorize negative current thru the connector? I think that if the current goes negative, the contactors inside the EV that feeds the chargeport opens, because it's an "abnormal" condition for the car. To be honest, I'm using the Codico Whitebeet CCS EVSE module for my charger, I never tried to actually "pull" current from the EV. However on the many EVs I tested, you can stay at 0A for a while, the DC chargeport contactors stay closed (after the precharge).

[@gaspererjavec7108]

excellent, just what we need :D

[@joostwestra]

Very nice! Do you already which cars support this? Are you limited to the 10.000kWh limit of Volkswagen or do you bypass the with your way of activating the contacters? I think most people understand what happens when the contactors are closed an stay closed. But any info here is very welcome. New subscriber for sure.

[@RedBatteryHead]

I'll wait for the IP66 version 😅 Nice job, using that Growatt.

[@EngineersFear]

Don't wait for it, build it :) I think Growatt would also work but this is SunGrow :)

[@lipkodima]

Really cool!!! I want make the same project with Deye 20K and my DIY EV) Now install Foccci )

[@pvande]

Ich bin beeindruckt, was alles geht, wenn man will und kann. Für alle, die nicht so tief in der Materie stecken, sollte vielleicht noch ein Warnhinweis zum Umgang mit Strömen über 50V gegeben werden.

[@lewurm]

very cool! Important milestone reached

[@thermoratz]

As engineer, many thanks for your amazing work. Do i find somewhere which car electronics you can communicate with? May be i missed that point.

[@ReddyToGo.]

Hi thermoratz, bist du schon bei den Nordkap-Vorbereitungen :-) What was the question? You mean which cars are supported by this approach? We collected some experiences in the openinverter forum, topic "Drawing power out of CCS port". Or do you mean which electronics of the Touran we are talking to? This is the open source CCS controller, aka Foccci. Basically at the end each CCS car is a candidate for such an approach. With some exceptions: Your 800V car would require an hybrid inverter that supports this voltage. Some cars are not happy with closing the contactors without beeing charged, e.g. the good old Ioniq classic terminates the session after 10 minutes of "not been charged."

[@EngineersFear]

I communicate with the CCS charging interface in the car. Inside the car the CCS interface communicates with the BMS for safe charging limits

[@thermoratz]

@@ReddyToGo. Yes, question was which cars are working with this approach. I expected some communication specialized for the brand of the car. Ok, there is a list. Thank you. Nordkap Vorbereitung, was ist das? 😉

[@carlosgaspar74]

👌 Bravo! Any car brands tested? Tesla doesn't like to turn on their HV contactors... 😅

[@ReddyToGo.]

Tesla needs physical precharge voltage, then it closes the contactors. The test results of different brands are collected in the openinverter forum, subject "Drawing power out of CCS port".

[@carlosgaspar74]

@ReddyToGo. Good to know. Thank you.

[@pxidr]

@@ReddyToGo. That physical precharge is actually mandated by the CCS standard

[@itekani]

Very cool! So does this only work with OpenInverter home built cars or does it also work with any OEM cars?

[@EngineersFear]

Right now, yes, probably. For most cars an additional circuit must be added that actually applies a voltage in the precharge state. Another issue is the long startup sequence of the inverter. It takes like 2 minutes from giving the start command until power delivery or consumption. So this must be cleverly times with the CCS state machine to not run into timeouts on the vehicle side.

[@idiNty]

Stabil!

[@J0hn1o1o]

Amazing Work! Do you have a rough estimation about the cost for the hardware needed to get the car's battery integrated to the house energy system? Main Component seems to be the sungrow inverter, but you need at least one computer, and lots of hardware for the communication.

[@EngineersFear]

The inverter cost me 550€ used, would be 850€ new. The PLC modem is from a consumer PLC bridge and was like 10€. Fuses, power supply, cable, enclosure and CCS plug say 200€. The computer is a BeagleBone green with comms cape and cost another 100€. In my case that was already present. So 760€ of additional hardware in my specific case

[@ua420]

Amazing. It would be great if we could build similar DIY system off common aliexpress boards\parts

[@EngineersFear]

Yes on the communication side the project is based on readily available components like a standard homeplug modem. For actual power delivery I would heavily advise on a proper inverter as it is grid connected. They are no that expensive anymore.

[@ReddyToGo.]

basically yes, but: Not all cars will be happy if the charger needs one or two minutes until the current flows. So there will be combinations (of slow "according to the regulation" inverters and picky cars) which will not work so easily.

[@EngineersFear]

@@ReddyToGo. Exactly, timing can be critical. I found the inverter runs its startup sequence once it sees sufficient voltage on the battery input. So if that is all prepared it should work

[@duniek86]

is this PLC powerline module can be used for CCS charging ? I am wondering for example if it will be possible to use vw UP chargers for diy CCS2 charger. OBC from VW are preety cheap used ( i saw it for 200euro even) 1phase - so for 600euro we got 21-22kW of charging power - ccs cable, contacors are common parts, only controller is challenging

[@EngineersFear]

Yes, read more here: github.com/uhi22/pyPLC/blob/master/doc/hardware.md

[@sandriusun]

Bravo!!!

[@certified-forklifter]

nice

[@enib3179]

Crazy 😮 du hast den Touran auf EV umgebaut und dann noch die Möglichkeit die Batterie fürs Haus zu nutzen?! Wie geil ist das denn?

[@nur_noch_elektrisch7429]

Stellt sich mir die Frage, ob das KFZ-BMS das nicht ganz einfach verhindern kann?

[@EngineersFear]

Hier haben wir einige Autos getestet: openinverter.org/forum/viewtopic.php?t=3551

[@ReddyToGo.]

Das kommt auf das BMS (bzw die Software des Ladecontrollers) an. Manche Fahrzeuge erlauben mehr, andere weniger. Der Touran ist open-source, da geht's natürlich völlig problemlos. Ein paar Erfahrungen mit anderen Fahrzeugen wurden im Forum gesammelt, unter dem Titel "Drawing power out of CCS port"

[@emceh]

On typical EV you could run DC/DC to keep 12V lead acid charged :)

[@EngineersFear]

Yes absolutely. If this turns out a problem I might wire it up that way.

[@honumoorea873]

We got a Ioniq 38 and it close the traction battery relay to charge (via Dc-Dv converter of course) the 12v battery which is a pathetic 40Ah 12v.... It die every 2 years cause of the multiple cycles it does being recharged multiple times a day (at the end of it 2 years life). So clearly in this car and too many EV, they under evaluated he 12v draw.....I'm now doing a specific support to replace the stock 40Ah with a bigger 60Ah.

[@rkan2]

​@@honumoorea873If you don't experience freezing, but a lifepo4 in there. I have a Porscha 40Ah in my 1.9 TDI during the summer. 😅