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Hi Paul
I just lost the post I had written!
Anyway - the story
A MOSFET blew on first start up with the main pack - I noticed the pop and smoke but the car drove OK so I thought that I had zapped a passing spider
I realized my error when I checked resistances to earth
I replaced the blown MOSFET and its neighbor which appeared to be cracked
At that stage the car was going well - easy 100Kph on its certification test and good acceleration
I left it sitting for about 10 days
First switch - one contactor and 12v for controller
Precharge - I am using a halogen bulb, this normally glows for a few seconds and goes out
On this occasion it stayed on
What I should have done was shut down and taken it apart
What I did do was switch on the second contactor
BANG - SMOKE - OOOPS
The blowup took out all of the MOSFETS and one of my cells
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