Keep trying, and failing, to start engine - what am I doing wrong?

[Grek]

After hot-wiring, will the SMES units still absorb the surplus power if the voltage on the cable is higher then it's input value?

Yes. This makes them good batteries for when there's a solar flare or something.

If the bug is related to 'too high input value', would setting the input values for the Solar SMES to 0 also be a solution? What about the other 4 SMES units?

Remember that the SMES only accepts an amount of power equal to the input value. If the input value is 0, it will accept 0 power. The same holds true for all SMES units.