[skooler]

Nick,

What are the dimensions of your fuse? brand/model?

I have a couple of spare fuseholders here that may be suitable(I could onlly buy a pack of 3!)

I'm more than happy to chuck one in the post for you if you like?

Cheers,

Mike

[Ziggythewiz]

What's with the two contactors around the fuse?

[Spyder.ev]

Hi guys,
To answer your questions the contractor on the left and the first1 connected to the fuse are for isolation only. The second is the controller conactor.
I did this for safety cut off I have an e-stop circuit running in the boot under the bonnet and through the ignition key. Thanks mike for offer if I change the way I'm doing things will def get hold of you
I am currently installing the heater and the new alloy washer tank, will update some pics tomorrow.
Cheers guys

[Tesseract]

Originally Posted by Spyder.ev

...the contractor on the left and the first1 connected to the fuse are for isolation only. The second is the controller conactor....

So, you are only using *one* EV200 contactor to handle the full battery current of your 260V/1200A controller?

"What Could Possibly Go Wrong???"

[Spyder.ev]

Hi tesseract,
Didn't read your first comment until now, totally agree should have at least 2 contactors
In parallel, as for netgain control, I'm going to have a chat with Ryan see if I can
Use my pedal.
Cheers guys any help is good

[Duncan]

Originally Posted by Spyder.ev

Hi tesseract,
Didn't read your first comment until now, totally agree should have at least 2 contactors
In parallel, as for netgain control, I'm going to have a chat with Ryan see if I can
Use my pedal.
Cheers guys any help is good

Do you mean - 2 contactors In parallel, ??

I am going to have two contactors (and a physical disconnect) in series

[Spyder.ev]

Originally Posted by Duncan

Do you mean - 2 contactors In parallel, ??

I am going to have two contactors (and a physical disconnect) in series

Hi duncan,
Yer I mean parallel, as teserract pointed out for full load I need to spread the load between the 2 contractors or I will burn out the contractor.
Which is bad...lol
Thx
Nick

[Duncan]

Originally Posted by Spyder.ev

Hi duncan,
Yer I mean parallel, as teserract pointed out for full load I need to spread the load between the 2 contractors or I will burn out the contractor.
Which is bad...lol
Thx
Nick

I may be wrong but I don't think that will help, the issue with a contactor is if it has to break the current under load

If you have two in parallel one will try and open first and will zorch as will it's buddy a few milliseconds later
The danger is that one of them will fail closed - and you could have a runaway

I expect that if I do have to open the circuit because of a failed controller my contactors will - expire - and not be re-useable

Two in series will give me a second bite if the first one fails to open
The physical disconnect will give a third chance

[Tesseract]

Originally Posted by Duncan

I may be wrong but I don't think that will help, the issue with a contactor is if it has to break the current under load

You are indeed wrong. If the contactors were on the motor side of the controller then you would be right as the motor is an inductive load which will try to maintain the flow of current even when the circuit is broken (by inducing a voltage high enough to cross whatever gap might be in the way).

The battery side of a motor controller, however, is a capacitive load, and opening up into such - even in the event of an extreme overcurrent - is relatively benign; it is closing the contactors which is potentially hazardous, instead, because a capacitive load looks like a dead-short to a difference in voltage, hence the need for "precharge".

[Duncan]

Thanks Tesseract

So I can reduce my worry about my contactors not opening - and when closed they should "current share" so 2 in parallel will only see the half the current.

So the worry about too small a contactor is overheating or stealing voltage across the closed contacts

Battery current is less than motor current so that is only an issue at higher speeds

I will be sticking to my series system as the regs here require me to open both sides of the battery

My pre-charge is a manual system - to start with at least