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Discussion Starter #1
Just thinking how many contactors are needed in a build is it two or three.

looking at Damien's last video on the HV connection box.

is a contactor needed for both pos and neg on the high voltage battery pack ?

looks like he just using a relay for pre charge is this sufficient or does it need a contactor too.
 

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Myself I’m using:
- Main +
- Main -
- Charger
As full current contactors.
A smaller precharge relay (rated for the high voltage but lower current).
Furthermore I’m using big contactors for my CHAdeMO + and -.
Additionally I’m using small contactors for the PTC element and perhaps HV battery heater.
 

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I’m using the following
HV +
HV -
Chademo +
Chademo -
Tesla gen 2 charger +
Tesla gen 2 charger -
Ptc heater +
Volt inverter +
Tesla heater +
 

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Discussion Starter #4
I’m using the following
HV +
HV -
Chademo +
Chademo -
Tesla gen 2 charger +
Tesla gen 2 charger -
Ptc heater +
Volt inverter +
Tesla heater +

wow thats a lot, i am thinking more along the lines of the expensive KILOVAC EV200 type that are well over £100 each, i suppose three of these are needed as a min is one of these needed for the precharge ?, what size contactors are you using for the other components ?
 

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To start, what kind of controller are you using? Some already control precharge. Curtis, Sevcon, etc all control precharge automatically.

Second, if you want extra safety, you can use a negative pack contactor, or emergency disconnect.

For BMS, they can turn on/off the charger. Some are via relay and an enable line to the charger and some operate by turning off the AC to the charger.
 

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wow thats a lot, i am thinking more along the lines of the expensive KILOVAC EV200 type that are well over £100 each, i suppose three of these are needed as a min is one of these needed for the precharge ?, what size contactors are you using for the other components ?

That is the contactor I am using. You have to look around for deals. I found a company in my state selling new ones for about $65 each after shipping. Yeah, not cheap but they are required.


They only come in one size. They are good up to 500 amps I believe. I am using the same contactor for all components. I have spec sheets if you want me to email them to you.
 
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