openinverter forum

I have a Tesla SDU with OpenInverter board and a repackaged MG ZS EV battery.

The MG battery comes with a 'penthouse' with contractors and pre-charge relay.

The wiring to the OpenInverter comms connector shows lines for 'main contractor [sic] relay' (P3) and 'pre-charge relay' (P11) Does this mean the SDU inverter contains contacts and pre-charge resistor? Do I just connect high voltage straight up to it?

No, this means that the LDU can control the two relays.

Ahh, ok. I assume that is the contactor coil shown in the diagram on the Main and Pre-charge lines. So the OpenInverter board pulls them low when it switches them on.

Makes perfect sense now thanks.

The diagram shows the required / optional circuits outside the drive unit