Hello all,
I've searched the archive for this topic but didn't find any that really
answered my question.
I'm about to wire up the engine compartment of my 914 and am acquiring the
odds and ends for it, one item being the inter-pack fuse. From what I've
read, I should use a fast-acting type fuse such as a Ferraz Shawmut
A30QA500-4 which is 300V 500A. These are fairly expensive at ~$50 per fuse.
I've read a little about fuse sizing but still it seems like an art form.
The fuse should carry the rated current for indefinite periods without
opening and should open at the interrupt rating. Is the short-circuit
current of a battery the max discharge current, and if so, the Thundersky
spec for its 200AH says it is <= 20CA or 4000A. If the short-circuit
current, say 4000A, is less than the fuse's interrupt rating, say 100KA for
the A30QS500, will the fuse open up? I'm just trying to figure out if I can
go with a lower rated voltage like 150V which is closer to my 120V and a
lower rated current like 400A. These are still Ferraz Shawmut fuses and a
A15QS400-4 goes (150V 400A) for about ~$30.
Both of the above fuses are rated AC and DC.
Here's the spec url for the 150V/400A fuse:
http://www.discountfuse.com/v/vspfiles/downloadables/Ferraz/PDF/a15qs.pdf
And the spec url for the 300V/500A fuse:
http://www.discountfuse.com/v/vspfiles/downloadables/Ferraz/PDF/a30qs.pdf
I don't mind spending the $$$ for the correct overcurrent device but want
to make sure I purchase what I need. Any advice you can give on this topic
is, as usual, much appreciated.
Thanks,
Hart Penn
http://evalbum.com/3402
http://hartpenn.blogspot.com
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I've searched the archive for this topic but didn't find any that really
answered my question.
I'm about to wire up the engine compartment of my 914 and am acquiring the
odds and ends for it, one item being the inter-pack fuse. From what I've
read, I should use a fast-acting type fuse such as a Ferraz Shawmut
A30QA500-4 which is 300V 500A. These are fairly expensive at ~$50 per fuse.
I've read a little about fuse sizing but still it seems like an art form.
The fuse should carry the rated current for indefinite periods without
opening and should open at the interrupt rating. Is the short-circuit
current of a battery the max discharge current, and if so, the Thundersky
spec for its 200AH says it is <= 20CA or 4000A. If the short-circuit
current, say 4000A, is less than the fuse's interrupt rating, say 100KA for
the A30QS500, will the fuse open up? I'm just trying to figure out if I can
go with a lower rated voltage like 150V which is closer to my 120V and a
lower rated current like 400A. These are still Ferraz Shawmut fuses and a
A15QS400-4 goes (150V 400A) for about ~$30.
Both of the above fuses are rated AC and DC.
Here's the spec url for the 150V/400A fuse:
http://www.discountfuse.com/v/vspfiles/downloadables/Ferraz/PDF/a15qs.pdf
And the spec url for the 300V/500A fuse:
http://www.discountfuse.com/v/vspfiles/downloadables/Ferraz/PDF/a30qs.pdf
I don't mind spending the $$$ for the correct overcurrent device but want
to make sure I purchase what I need. Any advice you can give on this topic
is, as usual, much appreciated.
Thanks,
Hart Penn
http://evalbum.com/3402
http://hartpenn.blogspot.com
-------------- next part --------------
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_______________________________________________
| 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