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Discussion Starter · #1 ·
Hi all,

I want to confirm where I should place my secondary High Voltage fuse for my HV battery pack. The primary fuse is right outside the positive side of the pack. My pack is physically separated into two banks; one in the front, and one in the rear.

Here's a picture:
http://corbinstreehouse.com/fuse.png

The top left bank of cells is the rear pack, which is right by the controller. The bottom right bank of cells is the front pack.

Should I place the second fuse where it is shown in the diagram, right off the + of the rear pack heading to the front pack (ie: separating the two packs), or right off the plus of the front pack (ie: protecting a short in the HV wire running to the rear of the car).

I'm unsure which is best. Opinions?

---corbin

I also posted the same question on DIY electric car...but I always like multiple opinions before I commit to something.

http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-battery-pack-53685.html

I may simply leave the fuse out for now until I know for sure (since the second fuse isn't absolutely necessary, and is backup safety).

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Discussion Starter · #2 ·
Hello Corbin,

The maximum run of wire that is un-fuse is 10 feet from the power source
which is design to carry that load.

The fuses should be place as close as possible on the positive side of the
battery pack. Lets say you have the two pos and neg feeder wires coming
from battery pack, there shall be a fuse before the wires running inside a
conduit or wireway. If the fuse is place after these two wires are place in
this type of enclosure, then the fuse will not blow which is place after the
shorted section between these two wires if the controller and/or main
contactor is open.

If the circuit is completely close where the controller and contactor is
close, then any short between the feeder conductors may blow both fuses.

Therefore if the fuses are place in the correct position, they will protect
the conductors when shorted and one fuse will blow. If you have a overload
in the motor and/or controller, then both fuses may blow.

It is common practice when we have a overload protection device in a
circuit. the main fuse or circuit breaker that comes off the main, will have
a higher interrupting capacity. The second overload device will have a
lower interrupting capacity. In this way, you can limit the tripping of one
device instead of having both trip.

My main fuse has a interrupting rating of 250,000 amps which is a Bussman
Limitron fuse. The next overload device is rated at 65,000 amps, the next
is 22,500 amps and the last one in the circuit is rated at 10,000 amps
interrupting capacity. This circuit design will normally only allow the
10,000 amp interrupting overload unit to blow first instead of all the
others down the line.

Roland






----- Original Message -----
From: "corbin dunn" <[email protected]>
To: "EVDL Discussion List" <[email protected]>
Sent: Saturday, January 01, 2011 10:01 AM
Subject: [EVDL] Secondary fuse location in battery pack


> Hi all,
>
> I want to confirm where I should place my secondary High Voltage fuse for
> my HV battery pack. The primary fuse is right outside the positive side of
> the pack. My pack is physically separated into two banks; one in the
> front, and one in the rear.
>
> Here's a picture:
> http://corbinstreehouse.com/fuse.png
>
> The top left bank of cells is the rear pack, which is right by the
> controller. The bottom right bank of cells is the front pack.
>
> Should I place the second fuse where it is shown in the diagram, right off
> the + of the rear pack heading to the front pack (ie: separating the two
> packs), or right off the plus of the front pack (ie: protecting a short in
> the HV wire running to the rear of the car).
>
> I'm unsure which is best. Opinions?
>
> ---corbin
>
> I also posted the same question on DIY electric car...but I always like
> multiple opinions before I commit to something.
>
> http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-battery-pack-53685.html
>
> I may simply leave the fuse out for now until I know for sure (since the
> second fuse isn't absolutely necessary, and is backup safety).
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
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| OTHER HELP: http://evdl.org/help/
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Discussion Starter · #3 ·
Roland makes some good points, but I would suggest you put the fuses
in the middle of each battery box to protect against accidental shorts
withing the box, dropped wrenches etc. In your rear box (the square
one) you only have a maximum of ~36V between adjacent terminals so
that's not too bad. In the large front box however you have 94V
between adjacent terminals, I'd definitly put a fuse in there and
maybe reconsider how you layed out the connections in that box.





On Sat, Jan 1, 2011 at 10:01 AM, corbin dunn
<[email protected]> wrote:
> Hi all,
>
> I want to confirm where I should place my secondary High Voltage fuse for my HV battery pack. The primary fuse is right outside the positive side of the pack. My pack is physically separated into two banks; one in the front, and one in the rear.
>
> Here's a picture:
> http://corbinstreehouse.com/fuse.png
>
> The top left bank of cells is the rear pack, which is right by the controller. The bottom right bank of cells is the front pack.
>
> Should I place the second fuse where it is shown in the diagram, right off the + of the rear pack heading to the front pack (ie: separating the two packs), or right off the plus of the front pack (ie: protecting a short in the HV wire running to the rear of the car).
>
> I'm unsure which is best. Opinions?
>
> ---corbin
>
> I also posted the same question on DIY electric car...but I always like multiple opinions before I commit to something.
>
> http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-battery-pack-53685.html
>
> I may simply leave the fuse out for now until I know for sure (since the second fuse isn't absolutely necessary, and is backup safety).
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>



--
www.electric-lemon.com

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Discussion Starter · #4 ·
Hi Roland,

Thanks again -- this does make sense. In my particular case, I should ideally fuse the positive on both sides of my two cell banks to protect the long runs of wire (both less than 10'), in addition to the normal fuse location right after the main positive of the entire pack. I think it is probably best for me to have my secondary fuse off the positive of the front pack, as a short in that might be more possible than shorting the other pack, as that will be carrying the higher voltage. However, it won't separate the two packs, which is my may concern. Is that better to do?

corbin


Roland Wiench wrote:

> Hello Corbin,
>
> The maximum run of wire that is un-fuse is 10 feet from the power source
> which is design to carry that load.
>
> The fuses should be place as close as possible on the positive side of the
> battery pack. Lets say you have the two pos and neg feeder wires coming
> from battery pack, there shall be a fuse before the wires running inside a
> conduit or wireway. If the fuse is place after these two wires are place in
> this type of enclosure, then the fuse will not blow which is place after the
> shorted section between these two wires if the controller and/or main
> contactor is open.
>
> If the circuit is completely close where the controller and contactor is
> close, then any short between the feeder conductors may blow both fuses.
>
> Therefore if the fuses are place in the correct position, they will protect
> the conductors when shorted and one fuse will blow. If you have a overload
> in the motor and/or controller, then both fuses may blow.
>
> It is common practice when we have a overload protection device in a
> circuit. the main fuse or circuit breaker that comes off the main, will have
> a higher interrupting capacity. The second overload device will have a
> lower interrupting capacity. In this way, you can limit the tripping of one
> device instead of having both trip.
>
> My main fuse has a interrupting rating of 250,000 amps which is a Bussman
> Limitron fuse. The next overload device is rated at 65,000 amps, the next
> is 22,500 amps and the last one in the circuit is rated at 10,000 amps
> interrupting capacity. This circuit design will normally only allow the
> 10,000 amp interrupting overload unit to blow first instead of all the
> others down the line.
>
> Roland
>
>
>
>
>
>
> ----- Original Message -----
> From: "corbin dunn" <[email protected]>
> To: "EVDL Discussion List" <[email protected]>
> Sent: Saturday, January 01, 2011 10:01 AM
> Subject: [EVDL] Secondary fuse location in battery pack
>
>
>> Hi all,
>>
>> I want to confirm where I should place my secondary High Voltage fuse for
>> my HV battery pack. The primary fuse is right outside the positive side of
>> the pack. My pack is physically separated into two banks; one in the
>> front, and one in the rear.
>>
>> Here's a picture:
>> http://corbinstreehouse.com/fuse.png
>>
>> The top left bank of cells is the rear pack, which is right by the
>> controller. The bottom right bank of cells is the front pack.
>>
>> Should I place the second fuse where it is shown in the diagram, right off
>> the + of the rear pack heading to the front pack (ie: separating the two
>> packs), or right off the plus of the front pack (ie: protecting a short in
>> the HV wire running to the rear of the car).
>>
>> I'm unsure which is best. Opinions?
>>
>> ---corbin
>>
>> I also posted the same question on DIY electric car...but I always like
>> multiple opinions before I commit to something.
>>
>> http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-battery-pack-53685.html
>>
>> I may simply leave the fuse out for now until I know for sure (since the
>> second fuse isn't absolutely necessary, and is backup safety).
>>
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

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Joined
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70 Posts
Discussion Starter · #5 ·
Hello Corbin,

That will work.

One thing is to think safety. It best not to place a expose fuse in a Class
1, Division 1 atmosphere which in this case will be hydrogen. Sometimes
these fuses will explode in half which it did in my in my EV during
charging. It blew the fuse in half igniting the hydrogen which blew up the
battery box cover and the glass hatch cover.

The fuse just age which was in the EV for 15 years. I change the fuses
every 10 years now. The fuses are install in a totally enclose compartment
on nylon standoffs. You could install them in a cast alloy box that is
rated for explosive proof for Class I, Division I atmospheres.

Just type in your search engine for Class I, Division I atmospheres to see
how electrical devices are install.

Roland


----- Original Message -----
From: "corbin dunn" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Saturday, January 01, 2011 12:09 PM
Subject: Re: [EVDL] Secondary fuse location in battery pack


> Hi Roland,
>
> Thanks again -- this does make sense. In my particular case, I should
> ideally fuse the positive on both sides of my two cell banks to protect
> the long runs of wire (both less than 10'), in addition to the normal fuse
> location right after the main positive of the entire pack. I think it is
> probably best for me to have my secondary fuse off the positive of the
> front pack, as a short in that might be more possible than shorting the
> other pack, as that will be carrying the higher voltage. However, it won't
> separate the two packs, which is my may concern. Is that better to do?
>
> corbin
>
>
>
Roland Wiench wrote:
>
> > Hello Corbin,
> >
> > The maximum run of wire that is un-fuse is 10 feet from the power source
> > which is design to carry that load.
> >
> > The fuses should be place as close as possible on the positive side of
> > the
> > battery pack. Lets say you have the two pos and neg feeder wires coming
> > from battery pack, there shall be a fuse before the wires running inside
> > a
> > conduit or wireway. If the fuse is place after these two wires are
> > place in
> > this type of enclosure, then the fuse will not blow which is place after
> > the
> > shorted section between these two wires if the controller and/or main
> > contactor is open.
> >
> > If the circuit is completely close where the controller and contactor is
> > close, then any short between the feeder conductors may blow both fuses.
> >
> > Therefore if the fuses are place in the correct position, they will
> > protect
> > the conductors when shorted and one fuse will blow. If you have a
> > overload
> > in the motor and/or controller, then both fuses may blow.
> >
> > It is common practice when we have a overload protection device in a
> > circuit. the main fuse or circuit breaker that comes off the main, will
> > have
> > a higher interrupting capacity. The second overload device will have a
> > lower interrupting capacity. In this way, you can limit the tripping of
> > one
> > device instead of having both trip.
> >
> > My main fuse has a interrupting rating of 250,000 amps which is a
> > Bussman
> > Limitron fuse. The next overload device is rated at 65,000 amps, the
> > next
> > is 22,500 amps and the last one in the circuit is rated at 10,000 amps
> > interrupting capacity. This circuit design will normally only allow the
> > 10,000 amp interrupting overload unit to blow first instead of all the
> > others down the line.
> >
> > Roland
> >
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "corbin dunn" <[email protected]>
> > To: "EVDL Discussion List" <[email protected]>
> > Sent: Saturday, January 01, 2011 10:01 AM
> > Subject: [EVDL] Secondary fuse location in battery pack
> >
> >
> >> Hi all,
> >>
> >> I want to confirm where I should place my secondary High Voltage fuse
> >> for
> >> my HV battery pack. The primary fuse is right outside the positive side
> >> of
> >> the pack. My pack is physically separated into two banks; one in the
> >> front, and one in the rear.
> >>
> >> Here's a picture:
> >> http://corbinstreehouse.com/fuse.png
> >>
> >> The top left bank of cells is the rear pack, which is right by the
> >> controller. The bottom right bank of cells is the front pack.
> >>
> >> Should I place the second fuse where it is shown in the diagram, right
> >> off
> >> the + of the rear pack heading to the front pack (ie: separating the
> >> two
> >> packs), or right off the plus of the front pack (ie: protecting a short
> >> in
> >> the HV wire running to the rear of the car).
> >>
> >> I'm unsure which is best. Opinions?
> >>
> >> ---corbin
> >>
> >> I also posted the same question on DIY electric car...but I always like
> >> multiple opinions before I commit to something.
> >>
> >> http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-battery-pack-53685.html
> >>
> >> I may simply leave the fuse out for now until I know for sure (since
> >> the
> >> second fuse isn't absolutely necessary, and is backup safety).
> >>
> >> _______________________________________________
> >> | REPLYING: address your message to [email protected] only.
> >> | Multiple-address or CCed messages may be rejected.
> >> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> >> | OTHER HELP: http://evdl.org/help/
> >> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
> >>
> >
> > _______________________________________________
> > | REPLYING: address your message to [email protected] only.
> > | Multiple-address or CCed messages may be rejected.
> > | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> > | OTHER HELP: http://evdl.org/help/
> > | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
 

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Registered
Joined
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Discussion Starter · #6 ·
I think Corbin is using LiFePo4 batteries, so, you would not have the
hydrogen.

Travis Tyler
http://www.evalbum.com/3145


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Roland Wiench
Sent: Saturday, January 01, 2011 1:27 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Secondary fuse location in battery pack

Hello Corbin,

That will work.

One thing is to think safety. It best not to place a expose fuse in a Class

1, Division 1 atmosphere which in this case will be hydrogen. Sometimes
these fuses will explode in half which it did in my in my EV during
charging. It blew the fuse in half igniting the hydrogen which blew up the
battery box cover and the glass hatch cover.

The fuse just age which was in the EV for 15 years. I change the fuses
every 10 years now. The fuses are install in a totally enclose compartment
on nylon standoffs. You could install them in a cast alloy box that is
rated for explosive proof for Class I, Division I atmospheres.

Just type in your search engine for Class I, Division I atmospheres to see
how electrical devices are install.

Roland


----- Original Message -----
From: "corbin dunn" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Saturday, January 01, 2011 12:09 PM
Subject: Re: [EVDL] Secondary fuse location in battery pack


> Hi Roland,
>
> Thanks again -- this does make sense. In my particular case, I should
> ideally fuse the positive on both sides of my two cell banks to protect
> the long runs of wire (both less than 10'), in addition to the normal fuse

> location right after the main positive of the entire pack. I think it is
> probably best for me to have my secondary fuse off the positive of the
> front pack, as a short in that might be more possible than shorting the
> other pack, as that will be carrying the higher voltage. However, it won't

> separate the two packs, which is my may concern. Is that better to do?
>
> corbin
>
>
>
Roland Wiench wrote:
>
> > Hello Corbin,
> >
> > The maximum run of wire that is un-fuse is 10 feet from the power source
> > which is design to carry that load.
> >
> > The fuses should be place as close as possible on the positive side of
> > the
> > battery pack. Lets say you have the two pos and neg feeder wires coming
> > from battery pack, there shall be a fuse before the wires running inside

> > a
> > conduit or wireway. If the fuse is place after these two wires are
> > place in
> > this type of enclosure, then the fuse will not blow which is place after

> > the
> > shorted section between these two wires if the controller and/or main
> > contactor is open.
> >
> > If the circuit is completely close where the controller and contactor is
> > close, then any short between the feeder conductors may blow both fuses.
> >
> > Therefore if the fuses are place in the correct position, they will
> > protect
> > the conductors when shorted and one fuse will blow. If you have a
> > overload
> > in the motor and/or controller, then both fuses may blow.
> >
> > It is common practice when we have a overload protection device in a
> > circuit. the main fuse or circuit breaker that comes off the main, will
> > have
> > a higher interrupting capacity. The second overload device will have a
> > lower interrupting capacity. In this way, you can limit the tripping of

> > one
> > device instead of having both trip.
> >
> > My main fuse has a interrupting rating of 250,000 amps which is a
> > Bussman
> > Limitron fuse. The next overload device is rated at 65,000 amps, the
> > next
> > is 22,500 amps and the last one in the circuit is rated at 10,000 amps
> > interrupting capacity. This circuit design will normally only allow the
> > 10,000 amp interrupting overload unit to blow first instead of all the
> > others down the line.
> >
> > Roland
> >
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "corbin dunn" <[email protected]>
> > To: "EVDL Discussion List" <[email protected]>
> > Sent: Saturday, January 01, 2011 10:01 AM
> > Subject: [EVDL] Secondary fuse location in battery pack
> >
> >
> >> Hi all,
> >>
> >> I want to confirm where I should place my secondary High Voltage fuse
> >> for
> >> my HV battery pack. The primary fuse is right outside the positive side

> >> of
> >> the pack. My pack is physically separated into two banks; one in the
> >> front, and one in the rear.
> >>
> >> Here's a picture:
> >> http://corbinstreehouse.com/fuse.png
> >>
> >> The top left bank of cells is the rear pack, which is right by the
> >> controller. The bottom right bank of cells is the front pack.
> >>
> >> Should I place the second fuse where it is shown in the diagram, right
> >> off
> >> the + of the rear pack heading to the front pack (ie: separating the
> >> two
> >> packs), or right off the plus of the front pack (ie: protecting a short

> >> in
> >> the HV wire running to the rear of the car).
> >>
> >> I'm unsure which is best. Opinions?
> >>
> >> ---corbin
> >>
> >> I also posted the same question on DIY electric car...but I always like
> >> multiple opinions before I commit to something.
> >>
> >>
http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-batte
ry-pack-53685.html
> >>
> >> I may simply leave the fuse out for now until I know for sure (since
> >> the
> >> second fuse isn't absolutely necessary, and is backup safety).
> >>
> >> _______________________________________________
> >> | REPLYING: address your message to [email protected] only.
> >> | Multiple-address or CCed messages may be rejected.
> >> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> >> | OTHER HELP: http://evdl.org/help/
> >> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
> >>
> >
> > _______________________________________________
> > | REPLYING: address your message to [email protected] only.
> > | Multiple-address or CCed messages may be rejected.
> > | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> > | OTHER HELP: http://evdl.org/help/
> > | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>

_______________________________________________
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| Multiple-address or CCed messages may be rejected.
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| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
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Registered
Joined
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70 Posts
Discussion Starter · #7 ·
When the fuse blew, it also burnt holes into the battery tops. I would
still put it into a cast Crouse Hinds chassis box or a plastic Carlen box
which has a self distinguish material.

Roland


----- Original Message -----
From: "Travis Tyler" <[email protected]>
To: "'Electric Vehicle Discussion List'" <[email protected]>
Sent: Saturday, January 01, 2011 1:55 PM
Subject: Re: [EVDL] Secondary fuse location in battery pack


> I think Corbin is using LiFePo4 batteries, so, you would not have the
> hydrogen.
>
> Travis Tyler
> http://www.evalbum.com/3145
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf
> Of Roland Wiench
> Sent: Saturday, January 01, 2011 1:27 PM
> To: Electric Vehicle Discussion List
> Subject: Re: [EVDL] Secondary fuse location in battery pack
>
> Hello Corbin,
>
> That will work.
>
> One thing is to think safety. It best not to place a expose fuse in a
> Class
>
> 1, Division 1 atmosphere which in this case will be hydrogen. Sometimes
> these fuses will explode in half which it did in my in my EV during
> charging. It blew the fuse in half igniting the hydrogen which blew up
> the
> battery box cover and the glass hatch cover.
>
> The fuse just age which was in the EV for 15 years. I change the fuses
> every 10 years now. The fuses are install in a totally enclose compartment
> on nylon standoffs. You could install them in a cast alloy box that is
> rated for explosive proof for Class I, Division I atmospheres.
>
> Just type in your search engine for Class I, Division I atmospheres to see
> how electrical devices are install.
>
> Roland
>
>
> ----- Original Message -----
> From: "corbin dunn" <[email protected]>
> To: "Electric Vehicle Discussion List" <[email protected]>
> Sent: Saturday, January 01, 2011 12:09 PM
> Subject: Re: [EVDL] Secondary fuse location in battery pack
>
>
> > Hi Roland,
> >
> > Thanks again -- this does make sense. In my particular case, I should
> > ideally fuse the positive on both sides of my two cell banks to protect
> > the long runs of wire (both less than 10'), in addition to the normal
> > fuse
>
> > location right after the main positive of the entire pack. I think it is
> > probably best for me to have my secondary fuse off the positive of the
> > front pack, as a short in that might be more possible than shorting the
> > other pack, as that will be carrying the higher voltage. However, it
> > won't
>
> > separate the two packs, which is my may concern. Is that better to do?
> >
> > corbin
> >
> >
> >
Roland Wiench wrote:
> >
> > > Hello Corbin,
> > >
> > > The maximum run of wire that is un-fuse is 10 feet from the power
> > > source
> > > which is design to carry that load.
> > >
> > > The fuses should be place as close as possible on the positive side of
> > > the
> > > battery pack. Lets say you have the two pos and neg feeder wires
> > > coming
> > > from battery pack, there shall be a fuse before the wires running
> > > inside
>
> > > a
> > > conduit or wireway. If the fuse is place after these two wires are
> > > place in
> > > this type of enclosure, then the fuse will not blow which is place
> > > after
>
> > > the
> > > shorted section between these two wires if the controller and/or main
> > > contactor is open.
> > >
> > > If the circuit is completely close where the controller and contactor
> > > is
> > > close, then any short between the feeder conductors may blow both
> > > fuses.
> > >
> > > Therefore if the fuses are place in the correct position, they will
> > > protect
> > > the conductors when shorted and one fuse will blow. If you have a
> > > overload
> > > in the motor and/or controller, then both fuses may blow.
> > >
> > > It is common practice when we have a overload protection device in a
> > > circuit. the main fuse or circuit breaker that comes off the main,
> > > will
> > > have
> > > a higher interrupting capacity. The second overload device will have
> > > a
> > > lower interrupting capacity. In this way, you can limit the tripping
> > > of
>
> > > one
> > > device instead of having both trip.
> > >
> > > My main fuse has a interrupting rating of 250,000 amps which is a
> > > Bussman
> > > Limitron fuse. The next overload device is rated at 65,000 amps, the
> > > next
> > > is 22,500 amps and the last one in the circuit is rated at 10,000 amps
> > > interrupting capacity. This circuit design will normally only allow
> > > the
> > > 10,000 amp interrupting overload unit to blow first instead of all the
> > > others down the line.
> > >
> > > Roland
> > >
> > >
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "corbin dunn" <[email protected]>
> > > To: "EVDL Discussion List" <[email protected]>
> > > Sent: Saturday, January 01, 2011 10:01 AM
> > > Subject: [EVDL] Secondary fuse location in battery pack
> > >
> > >
> > >> Hi all,
> > >>
> > >> I want to confirm where I should place my secondary High Voltage fuse
> > >> for
> > >> my HV battery pack. The primary fuse is right outside the positive
> > >> side
>
> > >> of
> > >> the pack. My pack is physically separated into two banks; one in the
> > >> front, and one in the rear.
> > >>
> > >> Here's a picture:
> > >> http://corbinstreehouse.com/fuse.png
> > >>
> > >> The top left bank of cells is the rear pack, which is right by the
> > >> controller. The bottom right bank of cells is the front pack.
> > >>
> > >> Should I place the second fuse where it is shown in the diagram,
> > >> right
> > >> off
> > >> the + of the rear pack heading to the front pack (ie: separating the
> > >> two
> > >> packs), or right off the plus of the front pack (ie: protecting a
> > >> short
>
> > >> in
> > >> the HV wire running to the rear of the car).
> > >>
> > >> I'm unsure which is best. Opinions?
> > >>
> > >> ---corbin
> > >>
> > >> I also posted the same question on DIY electric car...but I always
> > >> like
> > >> multiple opinions before I commit to something.
> > >>
> > >>
> http://www.diyelectriccar.com/forums/showthread.php/best-fuse-location-batte
> ry-pack-53685.html
> > >>
> > >> I may simply leave the fuse out for now until I know for sure (since
> > >> the
> > >> second fuse isn't absolutely necessary, and is backup safety).
> > >>
> > >> _______________________________________________
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> > >>
> > >
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> >
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> >
>
> _______________________________________________
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> _______________________________________________
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_______________________________________________
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