Tesla charger and battery. Simp BMS and inverter.

[tom91]

Luckily you can change the precharge time on the SimpBMS.

[joromy]

Yes I know, have tried to lower that, but anyway Johannes H. is to fast for you.....

The inverter is using voltage reading for closing POS contactor. Dont know how much time there is added.

[tom91]

Is the BMS continually powered?
As that is the way it is intended, it has quite a few 'checks' and settling time allowed during first boot.

[joromy]

No it's not powered all time.
Have tried to avoid that, it works this way, so I will keep it this way for now.
It can't be worse than not having NEG contactor?

The original Ranger electronics was a terrible 12V battery drainer. And almost all errors was related to low 12V battery.

[tom91]

Joromy,

Keep in mind this then screws up the SOC monitoring as it loses its last known spot.

On power on it uses cell voltage to determine SOC, this then gets corrected with charge and discharge cycles.

Can you see how much power it draws without any thing else on, so no contactors? I can always look at creating a sleep mode for there is no canbus activity.

[joromy]

Good point, I didn't think about that.
But I can easily connect back on all time power. Without opening the battery coffin.
I guess it's not using much power, but all battery BMB modules are also powered by the BMS.

Maybe I go for a small HV/LV dc/dc to keep things running...?

[joromy]

Have made a diagram of connections going in and out of batterybox C1939.
There are about 10 wires spare, for some extra. (I will use it for the battery heat/cool system)
Included connections for Tesla Charger, Inverter, Simp BMS, IAA, CAN, Contactors and relays.

Updated 10-feb-20

NEW BMS: (right click and "open/save link" to get big picture)

Original Ranger battery box cable, with new connectors:

[joromy]

Edited 17-feb-20
This info is not relevant for new design any more! (for reference only)

Have charged my pack with the Tesla charger and the key in "RUN" pos.
This works OK, but a lot of unnecessary modules are powered. And it's inconvenient to use the key.

If you cut 295 LB/PK wire going to the IAA C1945 pin 97 (12V RUN/START)
and connect it to J4-13 OUT3 on Simp BMS (charge enable) that also goes to charger A3 IN1.
Then only the IAA, BMS and charger is powered, water pump starts and radiator fan starts if coolant temp is over 40C.
You will need two small diodes. The IAA "RUN START" input only draw 27mA.

If you connect power to CAN display from IAA pin 97, it will power up in drive and charge mode.