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  #1  
Old 08-02-2012, 06:47 AM
TTmartin TTmartin is offline
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Default Battery pack fuse protection

As a newbie to EV's, I'm still very lacking in the knowledge required to actually carry out a conversion, I think that's probably applies to many people who stray into this EV world with sudden enthusiasm at doing something different and maybe challenging. This site is a great source of knowledge, Thanks to the many people who do have the skills and experience and are willing to share it.

Anyway back to the subject, Pack fuse and additional protection.

I've just started looking around for a DC rated 400amp fuse, my pack voltage is going to be around 200 volts when I eventually purchase some cells for my Audi TT, (no I'm not looking for high performance).

Problem is I am struggling to find a suitable fuse, In the UK.
They all seem to be 125v dc the highest I've found is 160v dc.
If anyone can point me in the right direction would be grateful.

I think I am correct in saying the voltage rating for a dc fuse is as important as amps.
In a short circuit situation AC goes to 0 in its cycle by nature and allows fuse to separate easier than DC.
DC by nature is continuous so when the fuse blows arching takes place and if the fuse used is not rated high enough voltage wise it may not break the circuit. Not good.
I think it would be really good if there was some basic nonconflicting information available on this site for minimum and ideal protection requirements on the HV system in a EV conversion.
How many conversions are out there with AC rated fuses for a DC pack or under voltage DC fuses at correct amperage?
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  #2  
Old 08-02-2012, 07:36 AM
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Default Re: Battery pack fuse protection

Quote:
Originally Posted by TTmartin View Post
Anyway back to the subject, Pack fuse and additional protection.

http://www.diyelectriccar.com/forums...ght=rated+fuse

http://www.diyelectriccar.com/forums...ght=rated+fuse

Also, the controller manual typically covers fuse requirements.
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  #3  
Old 08-02-2012, 07:47 AM
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Default Re: Battery pack fuse protection

For what its worth I am using a

Bussman SEMI CONDUCTOR fuse FWH-400A 500V


I have some bussman fuseholders similar to below if you need one?


http://www.ebay.co.uk/itm/Bussman-17...item518c445dd7


Cheers,


Mike
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  #4  
Old 08-02-2012, 07:52 AM
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Default Re: Battery pack fuse protection

Just found this:

Looks informative

http://www.galco.com/techdoc/buss/fwh-400a_app.pdf
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  #5  
Old 08-02-2012, 08:31 AM
TTmartin TTmartin is offline
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Default Re: Battery pack fuse protection

Thanks Major,
I thought it would all be on here somewhere,
It just worries me that theres probably a lot of people out there that think a fuse is a fuse AC or DC.
By nature EV conversions can be (D.I.Y) which means anyone can have ago,
Including me
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  #6  
Old 08-02-2012, 08:38 AM
TTmartin TTmartin is offline
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Default Re: Battery pack fuse protection

Quote:
Originally Posted by skooler View Post
For what its worth I am using a

Bussman SEMI CONDUCTOR fuse FWH-400A 500V


I have some bussman fuseholders similar to below if you need one?


http://www.ebay.co.uk/itm/Bussman-17...item518c445dd7


Cheers,


Mike
Thanks Mike,
I've been looking on eBay and that holder never came up?
Maybe it's the app I use on my ipad is limited or it's just me
where did you get the fuse? I might take you up on the holders.

Cheers

Martin.
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  #7  
Old 08-02-2012, 08:52 AM
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CrazyAl CrazyAl is offline
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Default Re: Battery pack fuse protection

Quote:
Originally Posted by TTmartin View Post
As a newbie to EV's, I'm still very lacking in the knowledge required to actually carry out a conversion, I think that's probably applies to many people who stray into this EV world with sudden enthusiasm at doing something different and maybe challenging. This site is a great source of knowledge, Thanks to the many people who do have the skills and experience and are willing to share it.

Anyway back to the subject, Pack fuse and additional protection.

I've just started looking around for a DC rated 400amp fuse, my pack voltage is going to be around 200 volts when I eventually purchase some cells for my Audi TT, (no I'm not looking for high performance).

Problem is I am struggling to find a suitable fuse, In the UK.
They all seem to be 125v dc the highest I've found is 160v dc.
If anyone can point me in the right direction would be grateful.

I think I am correct in saying the voltage rating for a dc fuse is as important as amps.
In a short circuit situation AC goes to 0 in its cycle by nature and allows fuse to separate easier than DC.
DC by nature is continuous so when the fuse blows arching takes place and if the fuse used is not rated high enough voltage wise it may not break the circuit. Not good.
I think it would be really good if there was some basic nonconflicting information available on this site for minimum and ideal protection requirements on the HV system in a EV conversion.
How many conversions are out there with AC rated fuses for a DC pack or under voltage DC fuses at correct amperage?
Check out http://evworks.com.au/index.php?category=13 who have Bussmann fuses and according to their website, some of them are rated to 500V DC with some of them rated to 600A. You might want to check with the vendor before buying if that current rating is peak or continuous loads.
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  #8  
Old 08-02-2012, 02:16 PM
TTmartin TTmartin is offline
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Default Re: Battery pack fuse protection

Quote:
Originally Posted by skooler View Post
For what its worth I am using a

Bussman SEMI CONDUCTOR fuse FWH-400A 500V


I have some bussman fuseholders similar to below if you need one?


http://www.ebay.co.uk/itm/Bussman-17...item518c445dd7
Cheers,
Mike
Once again cheers Mike,
I now have fuses and holders on there way via EBay.
If you can't do something, find a man that can

Thank you all for the information on this post

Martin.
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  #9  
Old 08-02-2012, 02:52 PM
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skooler skooler is offline
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Default Re: Battery pack fuse protection

Quote:
Originally Posted by TTmartin View Post
Once again cheers Mike,
I now have fuses and holders on there way via EBay.
If you can't do something, find a man that can

Thank you all for the information on this post

Martin.
No Worries,

Glad to be of help
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