Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

p477d343 · Post by **p477d343** » Thu Mar 20, 2025 1:45 am

Hello guys, yesterday. I perform a drawing power testing on my car(n7) when I plug the evse in with a ccs1 plug. But it end up stuck on sdp2. It seems like when evse sends sdp response back to pev. PEV did not continue to make TCP Negotiation.

When I try other brand's ev truck(not yes release). It went through right away and started drawing power from PEV with 2 lightbulbs.
The things that make the difference may have the following reasons.

My car(n7) does not have the right config with ipv6 address?

Code: Select all

[addressManager] Local IPv6 is fe80::2aae:949b:8102:4099%23
[addressManager] pev has IP fe80:0000:0000:0000:f2fd:ddff:fe00:688d

As far as I can know. EV truck is running on din 70121 with CCS1 only. Does it have a way to identify my n7 is running on 70121 or 15118? My projection is also running with 70121. But I don't know how n7 doesn't connect tcp to my win10 laptop.

Here are the logs(n7):

Code: Select all

starting in EvseMode
initializing pyPlcWorker
[addressManager] we have local MAC 00:E0:4C:36:28:D2. Todo: find this out dynamically.
[addressManager] Found 1 link-local IPv6 addresses.
fe80::2aae:949b:8102:4099%23
[addressManager] Local IPv6 is fe80::2aae:949b:8102:4099%23
The configured windows interface name is \Device\NPF_{A67CFB0A-4512-425C-9CC2-4D9081FD5DF9}
This interface is in pcap eth4
[addressManager] will give local MAC 00:E0:4C:36:28:D2
[addressManager] will give local MAC 00:E0:4C:36:28:D2
pyPlcIpv6 started with ownMac 00:E0:4C:36:28:D2
[addressManager] will give local MAC 00:E0:4C:36:28:D2
udplog started with ownMac 00:E0:4C:36:28:D2
logging to UDP Syslog is disabled
sniffer created at eth4
[543ms] [HARDWAREINTERFACE] Auto detection of serial ports. Available serial ports:
[560ms] [HARDWAREINTERFACE]  1: COM9                 'USB-SERIAL CH340 (COM9)'
[560ms] [HARDWAREINTERFACE] ok, we take the first port, COM9
[635ms] [pyPlcWorker] Software version v0.9-66-g698dcb1
[635ms] [EVSE] initializing fsmEvse
[641ms] pyPlcTcpSocket listening on port 15118
[641ms] Hostname is sickcellsXPS
[Testsuite]  received syslog packet: Test message to verify the syslog. pyPlcHomeplug.py is in the init function.
[678ms] NID is (7bytes) = 01 02 D3 D9 23 0A 07 
[679ms] transmitting SET_KEY.REQ, to configure the EVSE modem with random NMK (16bytes) = 77 77 7F 19 A7 D0 A8 77 77 77 77 77 77 77 77 77 
[726ms] received SET_KEY.CNF
[726ms] SetKeyCnf says 1, this is formally 'rejected', but indeed ok.
[1457ms] [HARDWAREINTERFACE] 0 bytes received: 
[2062ms] [HARDWAREINTERFACE] 0 bytes received: 
[2652ms] [HARDWAREINTERFACE] 1 bytes received: Y
[2700ms] [HARDWAREINTERFACE] 0 bytes received: 
[3289ms] [HARDWAREINTERFACE] 0 bytes received: 
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[3926ms] [HARDWAREINTERFACE] 0 bytes received: 
[4531ms] [HARDWAREINTERFACE] 0 bytes received: 
[5183ms] [HARDWAREINTERFACE] 0 bytes received: 
[5786ms] [HARDWAREINTERFACE] 0 bytes received: 
[6392ms] [HARDWAREINTERFACE] 0 bytes received: 
[7041ms] [HARDWAREINTERFACE] 0 bytes received: 
[7226ms] received SLAC_PARAM.REQ
[addressManager] pev has MAC xx:xx:xx:xx:xx:xx
[7261ms] [EVSE] transmitting CM_SLAC_PARAM.CNF
[7305ms] Checkpoint102: received SLAC_PARAM.CNF
[7444ms] received MNBC_SOUND.IND
[7491ms] received MNBC_SOUND.IND
[7491ms] received MNBC_SOUND.IND
[7537ms] received MNBC_SOUND.IND
[7538ms] received MNBC_SOUND.IND
[7583ms] received MNBC_SOUND.IND
[7584ms] received MNBC_SOUND.IND
[7630ms] received MNBC_SOUND.IND
[7631ms] received MNBC_SOUND.IND
[7632ms] [HARDWAREINTERFACE] 1 bytes received: y
[7675ms] received MNBC_SOUND.IND
[7676ms] [EVSE] transmitting ATTEN_CHAR.IND
[7678ms] [HARDWAREINTERFACE] 0 bytes received: 
[7721ms] received ATTEN_CHAR.IND
[7721ms] received SLAC_MATCH.REQ
[7724ms] [EVSE] transmitting SLAC_MATCH.CNF
[8283ms] [HARDWAREINTERFACE] 0 bytes received: 
[addressManager] pev has IP fe80:0000:0000:0000:f2fd:ddff:fe00:688d
V2GTP (10bytes) = 01 FE 90 00 00 00 00 02 10 00 
Ok, this was a valid SDP request. We are the SECC. Sending SDP response.
SDP payload (20bytes) = FE 80 00 00 00 00 00 00 2A AE 94 9B 81 02 40 99 3B 0E 10 00 
V2Gframe (28bytes) = 01 FE 90 01 00 00 00 14 FE 80 00 00 00 00 00 00 2A AE 94 9B 81 02 40 99 3B 0E 10 00 
V2GTP (28bytes) = 01 FE 90 01 00 00 00 14 FE 80 00 00 00 00 00 00 2A AE 94 9B 81 02 40 99 3B 0E 10 00 
[8906ms] [HARDWAREINTERFACE] 0 bytes received: 
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[33830ms] [HARDWAREINTERFACE] 0 bytes received: 
[34483ms] [HARDWAREINTERFACE] 0 bytes received: 
[34669ms] received SLAC_PARAM.REQ
[addressManager] pev has MAC xx:xx:xx:xx:xx:xx
[34673ms] [EVSE] transmitting CM_SLAC_PARAM.CNF
[34762ms] Checkpoint102: received SLAC_PARAM.CNF
[34857ms] received MNBC_SOUND.IND
[34861ms] received MNBC_SOUND.IND
[34965ms] received MNBC_SOUND.IND
[34966ms] received MNBC_SOUND.IND
[34966ms] received MNBC_SOUND.IND
[34967ms] received MNBC_SOUND.IND
[35058ms] received MNBC_SOUND.IND
[35058ms] received MNBC_SOUND.IND
[35060ms] received MNBC_SOUND.IND
[35062ms] [HARDWAREINTERFACE] 0 bytes received: 
[35152ms] received MNBC_SOUND.IND
[35153ms] [EVSE] transmitting ATTEN_CHAR.IND
[35245ms] received ATTEN_CHAR.IND
[35245ms] received SLAC_MATCH.REQ
[35248ms] [EVSE] transmitting SLAC_MATCH.CNF
[35712ms] [HARDWAREINTERFACE] 0 bytes received: 
[addressManager] pev has IP fe80:0000:0000:0000:f2fd:ddff:fe00:688d
V2GTP (10bytes) = 01 FE 90 00 00 00 00 02 10 00 
Ok, this was a valid SDP request. We are the SECC. Sending SDP response.
SDP payload (20bytes) = FE 80 00 00 00 00 00 00 2A AE 94 9B 81 02 40 99 3B 0E 10 00 
V2Gframe (28bytes) = 01 FE 90 01 00 00 00 14 FE 80 00 00 00 00 00 00 2A AE 94 9B 81 02 40 99 3B 0E 10 00 
V2GTP (28bytes) = 01 FE 90 01 00 00 00 14 FE 80 00 00 00 00 00 00 2A AE 94 9B 81 02 40 99 3B 0E 10 00 
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user action x

Wireshark pcap with success drawing power from ev truck:

ev_truck_drawing_success.zip: (32.15 KiB) Downloaded 468 times

uhi22 · Post by **uhi22** » Thu Mar 20, 2025 5:30 am

A wireshark pcap of the failed case should show whether the PEV sends a TCP connect request.

YouTube · Post by **johu** » Sun Mar 23, 2025 7:15 am

I tried yesterday with an Audi Q4 E-Tron.

First I found I had used the wrong output resistors for 5% PWM, 10k instead of 1k. With that I didn't even get past SLAC. So I corrected the resistor but then didn't get past CableCheck. It simply stops sending requests after the 4th request.

Possible reasons:
- My PWM is not going down to -12V, just 0V
- On chargers put 500V on the charge port during CableCheck, I can't do that (only 300V)

I was hoping it would go to PreCharge so I could test my little DC-DC converter but no luck. Anything sticking out from the log?

uhi22 · Post by **uhi22** » Sun Mar 23, 2025 7:45 am

I have no real idea. You could try to see what happens if we send the "cable check finished" already at the second loop. By decreasing the number here https://github.com/uhi22/pyPLC/blob/761 ... se.py#L250

And maybe check the PP resistance. And yes, the minus 12V.

p477d343 · Post by **p477d343** » Sun Apr 13, 2025 8:59 am

uhi22 wrote: ↑Thu Mar 20, 2025 5:30 am A wireshark pcap of the failed case should show whether the PEV sends a TCP connect request.

Hello guys, last time I was testing with n7. It stuck the SDP stage. And I forgot to record the packet with Wireshark. The next time, I try to test with miniEVSE. Somehow, the PWM doesn't work anymore. And the problem would be the inferior quality of LF355N. So I purchased a new one from STMicroelectronics. Test with oscilloscope, I am sure that it produces 1 kHz 5% PWM signal when I plug into EV. It seems like it did not wake up the EVCC with PWM signal. I have to test to different plug. One from j1772 plug with custom wire. And one that 3 small metal pipe connect with wire. Both are not getting any SLAC startup request from EV.

Any ideas why? I don't have another EV to test right now. Also, I am not sure about what I was missing. I think it is possible that every EV has some small different to wake up EVCC via PWM?

Here are my PLC modem version:

Here are my logs:

Code: Select all

starting in EvseMode
initializing pyPlcWorker
[addressManager] we have local MAC 00:E0:4C:36:28:D2. Todo: find this out dynamically.
[addressManager] Found 1 link-local IPv6 addresses.
fe80::19f2:db35:ec31:5f8%8
[addressManager] Local IPv6 is fe80::19f2:db35:ec31:5f8%8
The configured windows interface name is \Device\NPF_{4C95DA23-E78D-4555-8861-C0F158E9F74E}
This interface is in pcap eth4
[addressManager] will give local MAC 00:E0:4C:36:28:D2
[addressManager] will give local MAC 00:E0:4C:36:28:D2
pyPlcIpv6 started with ownMac 00:E0:4C:36:28:D2
[addressManager] will give local MAC 00:E0:4C:36:28:D2
udplog started with ownMac 00:E0:4C:36:28:D2
logging to UDP Syslog is disabled
sniffer created at eth4
[442ms] [HARDWAREINTERFACE] Auto detection of serial ports. Available serial ports:
[452ms] [HARDWAREINTERFACE]  1: COM12                'Silicon Labs CP210x USB to UART Bridge (COM12)'
[452ms] [HARDWAREINTERFACE] ok, we take the first port, COM12
[680ms] [pyPlcWorker] Software version v0.9-66-g698dcb1
[680ms] [EVSE] initializing fsmEvse
[683ms] pyPlcTcpSocket listening on port 15118
[683ms] Hostname is sickcellsXPS
[Testsuite]  received syslog packet: Test message to verify the syslog. pyPlcHomeplug.py is in the init function.
[730ms] NID is (7bytes) = 01 02 42 13 A3 F5 07 
[730ms] transmitting SET_KEY.REQ, to configure the EVSE modem with random NMK (16bytes) = 77 77 74 90 17 B6 01 77 77 77 77 77 77 77 77 77 
[774ms] received SET_KEY.CNF
[774ms] SetKeyCnf says 1, this is formally 'rejected', but indeed ok.
[1025ms] [HARDWAREINTERFACE] 0 bytes received: 
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user action ??
[61497ms] [HARDWAREINTERFACE] 0 bytes received: 
user action Shift_L
user action x

Here are the pcap:

n7_fail.zip: (2.58 KiB) Downloaded 495 times

p477d343 · Post by **p477d343** » Fri May 02, 2025 8:24 am

p477d343 wrote: ↑Sun Apr 13, 2025 8:59 am Hello guys, last time I was testing with n7. It stuck the SDP stage. And I forgot to record the packet with Wireshark. The next time, I try to test with miniEVSE. Somehow, the PWM doesn't work anymore. And the problem would be the inferior quality of LF355N. So I purchased a new one from STMicroelectronics. Test with oscilloscope, I am sure that it produces 1 kHz 5% PWM signal when I plug into EV. It seems like it did not wake up the EVCC with PWM signal. I have to test to different plug. One from j1772 plug with custom wire. And one that 3 small metal pipe connect with wire. Both are not getting any SLAC startup request from EV.

Any ideas why? I don't have another EV to test right now. Also, I am not sure about what I was missing. I think it is possible that every EV has some small different to wake up EVCC via PWM?

Here are my PLC modem version:
螢幕擷取畫面 2025-04-13 131150.png

Here are my logs:

Code: Select all

starting in EvseMode
initializing pyPlcWorker
[addressManager] we have local MAC 00:E0:4C:36:28:D2. Todo: find this out dynamically.
[addressManager] Found 1 link-local IPv6 addresses.
fe80::19f2:db35:ec31:5f8%8
[addressManager] Local IPv6 is fe80::19f2:db35:ec31:5f8%8
The configured windows interface name is \Device\NPF_{4C95DA23-E78D-4555-8861-C0F158E9F74E}
This interface is in pcap eth4
[addressManager] will give local MAC 00:E0:4C:36:28:D2
[addressManager] will give local MAC 00:E0:4C:36:28:D2
pyPlcIpv6 started with ownMac 00:E0:4C:36:28:D2
[addressManager] will give local MAC 00:E0:4C:36:28:D2
udplog started with ownMac 00:E0:4C:36:28:D2
logging to UDP Syslog is disabled
sniffer created at eth4
[442ms] [HARDWAREINTERFACE] Auto detection of serial ports. Available serial ports:
[452ms] [HARDWAREINTERFACE]  1: COM12                'Silicon Labs CP210x USB to UART Bridge (COM12)'
[452ms] [HARDWAREINTERFACE] ok, we take the first port, COM12
[680ms] [pyPlcWorker] Software version v0.9-66-g698dcb1
[680ms] [EVSE] initializing fsmEvse
[683ms] pyPlcTcpSocket listening on port 15118
[683ms] Hostname is sickcellsXPS
[Testsuite]  received syslog packet: Test message to verify the syslog. pyPlcHomeplug.py is in the init function.
[730ms] NID is (7bytes) = 01 02 42 13 A3 F5 07 
[730ms] transmitting SET_KEY.REQ, to configure the EVSE modem with random NMK (16bytes) = 77 77 74 90 17 B6 01 77 77 77 77 77 77 77 77 77 
[774ms] received SET_KEY.CNF
[774ms] SetKeyCnf says 1, this is formally 'rejected', but indeed ok.
[1025ms] [HARDWAREINTERFACE] 0 bytes received: 
[1629ms] [HARDWAREINTERFACE] 0 bytes received: 
[2285ms] [HARDWAREINTERFACE] 0 bytes received: 
[2890ms] [HARDWAREINTERFACE] 0 bytes received: 
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[61345ms] [HARDWAREINTERFACE] 0 bytes received: 
user action ??
[61497ms] [HARDWAREINTERFACE] 0 bytes received: 
user action Shift_L
user action x

er
Here are the pcap:
n7_fail.zip

Hi guys, after testing another EV truck, I confirmed that MiniEVSE didn't break. It works well and draws out the EV truck's energy. But the only problem is that the CP voltage is too low. Before plugging it into the EV, its CP voltage was 10.7V. I was suspecting that the reason why MiniEVSE can't wake N7's EVCC up is that my CP Voltage(10.7V) is not included in the right CP range. I am guessing it is 12V with a deviation +-1V.

I am now using STMicroelectronics's LF355N. Its datasheet said its typical output range should be between +-12V and +-13V with input +15.1V and -12V. Right now, I have +12.8V and -12.8V input. Will it be the difference that my positive input is too low?

Another thing that I test is LF353P(refer to the image from this:https://github.com/uhi22/pyPLC/blob/mas ... d#hardware)
After replacing the LF353P with LF355N. I can measure the pin 1 output voltage to be 12V. And pin7 output is -11.4V.
But after connecting to the PEV. It did now generate the PWM signal while using the Oscilloscope to observe it.

PWM signal from Arduino to pin 3.

+12V to pin 8.

-12V to pin 4.

5v and GND with 2*120k to pin 2.

How do you connect to CP with only positive output 12V that can generate a PWM signal while using LF353P?

Has anyone similar problem or encountered things like EVCC will check restrict CP range(For eample:11.5V~12.5V)?

p477d343 · Post by **p477d343** » Fri May 09, 2025 10:20 am

lewurm wrote: ↑Thu Mar 06, 2025 9:42 pm I did that a few days after I've posted that and with v5.0 I did not get a single timeout since. I'm also using the DC Wallbox exclusively since then.
Screenshot 2025-03-06 at 22.29.30.png

The only limitation left is really the 15Ah discharge limit. The limit is okay on days like today were almost 30kWh have been charged into the car, so I have around ~35kWh to get through the night but still a bit annoying, e.g. if the car is taken for a trip in the evening. I think the state machine could be resetted if I would be able to put PP behind a relay, so that a physical unplug&plug could be simulated. I tried to open the CCS plug, but there seems to be some glue for sealing... I didn't dare to use too much force... yet.

Luckily there are two pairs for PT1000s on DC+ and DC-, which could be used for PP instead, so no extra cable must be run to the wallbox. Found a video where a CCS plug is disassembled:

Hello, I am currently working on drawing energy from Tesla. I have successfully convinced the Tesla system to enter the PreCharge stage. However, due to the absence of actual voltage applied to the DC+ and DC- pins, it always times out after 10 seconds of the precharge capacitor exchange. Based on my research, I understand that using a DC‑DC Boost Converter Voltage Step-Up Board (1000V Adjustable DC Voltage Regulator) could resolve this issue.

My question is: I am unsure how to properly wire this module with the pyPLC miniEVSE hardware. Could you kindly provide guidance on how to utilize the DC-DC Boost module to bypass Tesla's precharge stage and successfully close the relay switch to power a light bulb? This experiment is purely for testing purposes, and I do not intend to build a DIY EVSE for home use. Thank you!

lewurm · Post by **lewurm** » Mon May 12, 2025 9:22 pm

I'm not familiar with the miniEVSE hardware. I posted about my setup earlier in this thread:

lewurm wrote: ↑Wed Jan 22, 2025 11:16 pm Regarding the step-up converter, I followed the mod described here: https://github.com/dalathegreat/Battery ... age-source
And have a little calibration script to figure out good frequencies for the PWM: https://github.com/lewurm/pyPLC/blob/di ... ter_mod.py
It depends on your input voltage, but then didn't require much tuning, it rarely needs more than one attempt before the car is happy: https://github.com/lewurm/pyPLC/blob/cd ... #L303-L339
It's pretty solid!

A more recent source reference: https://github.com/lewurm/pyPLC/blob/ac ... #L393-L423
I basically gave up to guess the expected voltage, and just try a set of known good values. The first one works for SoC >30% on the first try most of the time.

So on your miniEVSE hardware you are going to need a pin that is configurable as a PWM. You also need a stable low-voltage source to get reliable results (at least in my experience), so I have a dedicated random 5V USB power supply in use. Using Vcc from the Raspberry Pi4 basically killed the Pi on every Precharge, that wasn't too useful

Then do the little mod as described in the linked battery emulator wiki page. I recommend to just try around first and measure the output HV voltage to get a sense what ranges do make sense in your setup. I guess the frequencies that I'm using are not useable for your hardware, at least I wouldn't rely on that

for good measure, I put a 1A fuse on each line between step-up converter and HV lines.

---------------

Update from my side: I managed to open the CCS enclosure without breaking it, and used on of the wires of PT1000 sensors to pipe PP back to the wallbox (I'm not using the temp sensors anyways, not going on much with 13A...). That means I have PP attached to a relay, and can simulate an "unplugging event". Cutting PP for a few seconds (together with CP, otherwise the car is not happy) is enough to clear the 15Ah limit. Also note: Really only do a few seconds, otherwise the car tries to close the lid, and that doesn't sound too nice when the CCS plug is still there...

In practice that means that when the 15Ah limit is hit, I have a 2min downtime (because I'm also restarting the Pi) and then everything is back to business, without me doing anything manual. wohoo!

The not so great news is that I somehow summoned a new foe aka. the 0.6Ah limit. I haven't figured out yet how to summon it, but I get it 2-3 times a week. I started to think that I noticed a pattern, but that was invalided last week. By now I believe some Tesla engineer is just trolling me or so

Alas the same trick as for clearing the 15Ah limit does not work. However if I get the car to sleep that does clear it, which is a bit of a convoluted Home Assistant automation and takes around 15min downtime. That is, stop charging and wait until I see via the Tesla API if the car is sleeping (~10min), let it sleep for a few minutes and then start charging again. Not great, not terrible

I haven't touched the AC charger since Feburary, stats so far:

Started to write together some stuff, but I suck at it. Sorry

At least I updated my pyPLC fork: https://github.com/lewurm/pyPLC/commits/diy-dc-wallbox
Although I'm very happy with my setup, it's also a bit convoluted as there are many components involved to make it actually comfortable to use. Apart from the Raspberry Pi I have also a Home Assistant instance running that e.g. has a zigbee button hooked up in the garage to stop the charging session and unlock the charge port; the latter using an esp32 running esphome-tesla-ble to talk to the car via bluetooth. My point being: The setup is somewhat hard to reproduce. I'll still try to have a single document that at least contains all the right pointers, but it won't be something like OpenEVSE for an AC charger alas.

Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)

Re: Drawing power out of CCS port (V2x, inverse charging, bidirectional CCS)