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Discussion Starter · #21 ·
Hi Paul,
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Why does an EV have a 12 V battery?
Well the energy stored in the battery pack is possibly fatal and pretty massive. So basically its a safety issue. 12Vbattery seems to help starting up the car, indicators etc etc. Plus it's dead cheap.
Safer, cheaper. But it seems kind of weird, ger your point.
According to my Mazda dealer the idea is to have zero connection between the high voltage pack and the 12V battery. The main pack is 355 V.
Medic myself but think that's roughly right.
 

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Lethal voltage level is defined as greater than 60 volts and in EV's such cable is always shrouded in orange. The 12 volt battery regulates supply to all the 12 volt stuff such as lights, wipers etc but it carries out the vital task of switching on the high voltage battery. So the 12 volt system is crucial and without it, the car doesn't move. It is a common form of EV failure and you will see from other threads that VW are currently having trouble with the ID3 as Nissan have suffered in the past with the Leaf. Take care of that little battery; it's only 42Ah!.
 
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