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Shunt:BMW SBOX
Caution
Working with high voltage is dangerous. Always follow local laws and regulations regarding high voltage work. If you are unsure about the rules in your country, consult a licensed electrician for more information.
Preface, the entire Battery-Emulator project sets out to achieve safe re-use of EV batteries. By building your own battery, you will be taking larger risks. Take extra precaution when working on a custom DIY HV battery, you have been warned.
The BMW S-BOX is a safety box that includes precharge contactors as well as voltage and current probes and fuse. S-BOX can be used eg. on DIY HV Battery and with CHAdeMo vehicles
| Part Number | Supported | Precharge resistor | Negative/Positive Relays | Precharge relay | Fuse | Notes |
|---|---|---|---|---|---|---|
| 8686893 | ✅ | 15 Ω | AEV14012 120A/450V (400A 30s) | AEC51012 | 7GP074 450V 350A | HW 24.002, SW 10.050 |
White connector:
- PIN 1: CAN-H NOTE: 120ohm internal resistor!
- PIN 10: CAN-L
- PIN 3: GND
- PIN 12: +12V (Electronics, ~250mA)
- PIN 14: +12V (Contactors)
The S-BOX uses the following CAN message IDs: 0x100, 0x110, 0x200, 0x210, 0x220, 0x230, 0x300, 0x310, 0x320, 0x321, 0x322, 0x410, 0x510, 0x511, 0x5F0, 0x5F1 and 0x600. When connecting the S-BOX to a shared CAN bus, ensure that these IDs are not already in use by other devices on the same bus to avoid conflicts.
You can adjust the voltage limits and relay timers by modifying the BMW-SBOX.h file.