ACEV Charger states

[alexeiw123]

I know this was discussed in the previous 'yaml' integration, but a) I couldn't find it and b) I think it would be useful to have here.

Modbus documentation v2.5 Modbus.Protocol.EN.-.SIGEN_v2.5.pdf

Shows the charging states in section 5.5

No	Name	Add.	QTY	Perm.	Data Type	Gain	Unit	Comment
1	System state	32000	1	RO	U16	N/A	N/A	System states according to IEC61851-1 definition. Refer to Appendix 7.
2	Total energy consumed	32001	2	RO	U32	100	kWh
3	Charging power	32003	2	RO	S32	1000	kW
4	Rated power	32005	2	RO	U32	1000	kW
5	Rated current	32007	2	RO	S32	100	A
6	Rated voltage	32009	1	RO	U16	10	V
7	AC-Charger input breaker rated current	32010	2	RO	S32	100	A
8	Alarm1	32012	1	RO	U16	N/A	N/A	Refer to Appendix 8
9	Alarm2	32013	1	RO	U16	N/A	N/A	Refer to Appendix 9
10	Alarm3	32014	1	RO	U16	N/A	N/A	Refer to Appendix 10

https://driivz.com/blog/ev-charging-guide/ has some details on the IEC61851-1 state definitions:

State	Charging Status
A	Standby
B	Vehicle detected
C	Ready for charging (ventilation not required)*
D	Ready for charging (ventilation required)
E	EVSE shut off
F	Error

From above, I can add a column to appendix 7 from the modbus protocol to try and figure out the meaning for each of the states.
Note that I've only just got my AC EV charger working through modbus, so haven't yet attempted to verify these beyond unplugged and charging. Text with ?? is what I think needs verifying.

System State	Value	Plain Text Meaning
System innit	0x00	?System initialisation?
A1/A2	0x01	Unplugged standby
B1	0x02	?Plugged in standby car ready?
B2	0x03	?Plugged in standby car not ready?
C1	0x04	?some sort of ready for charging state?
C2	0x05	charging
F	0x06	?Error?
E	0x07	?EVSE off?

@TypQxQ could we add a state sensor that gives meaningful outputs in HA when we've figured this out?

[fbradyirl]

What I can see from testing is

B1: 'Reserving' - plugged in but ACEV not providing power to the car.
B2: 'Charging' - Power being offered to the car but car not ready to take it yet (or car max SOC reached).
C2: 'Charging' - Power offered and accepted by the car.

A1/A2: 'Not plugged in'

[TypQxQ]

Thank you. I will take a look when I have some free time.
Been busy with work and the kids.

[alexeiw123]

Edit:
Just noticed that B1 also occurs when the car is fully charged, so it's not as simple as what I wrote below.

I've now observed that B1 and B2 align with the sigen app states for:
B1 = Occupied
B2 = Preparing

I've just observed that under 'PV surplus charging':
B1 = "Green energy not meeting start criteria"
B2 = "Ready to charge"

I was just testing my solar curtailment automation and was able to increase solar generation then observe the state change to form B1 to B2, then shortly after C2 (charging). Very handy for allowing the EV charger to start when PV curtailment is active.

[alexeiw123]

@TypQxQ I see you've updated charger system state in the latest update - which is great.
Can we keep the system state then append the the description to allow us to test and confirm all the different states?

I've got managed charging through tesla API as well solar charging through the sigen ACEV charger. I've seen both states B1 and B2 as well as C1 and C2 but haven't been able to determine the specific conditions for them yet. With the updated descriptions I can no longer tell which state it is.

Or alternatively - can we have two sensors? One text, one state?