19" DIY Power Packs

Redpacket

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Feb 28, 2018
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1,247
Riplash said:
And will they willbe treated like High Voltage connections as much as I can. (Hard to turn off the batteries when you work on them...They are always on)

It may help safety to have a breaker or isolator switch mid pack so you can break it into modules to work on as well as disconnecting the whole pack ie without a ground or battery +ve connected.

Large diameter heatshrink might be an option vs electrical tape?
 

schmue

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Jul 16, 2018
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Hey Guys. I can get a lot of 1/4W resistors. I want to use their legs as fuse wires. Do you recommend them or should I go for the 1/8W?
 

Redpacket

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It depends on the thickness which of course determines the "blow" current.
Keep in mind that resistor legs are usually copper wire inside which is different to fuse wire & blows at a higher current for the same size.
1/8w resistors would be closer to the the amps you'd want the fusing to happen.
 

Riplash

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May 27, 2018
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schmue said:
Hey Guys. I can get a lot of 1/4W resistors. I want to use their legs as fuse wires. Do you recommend them or should I go for the 1/8W?

Hello Schmue,

I would recommend that you get the wire for fusesby specifyingthe wire. What I mean is if you want touse 30 AWG TCW buy that particular wire.or if you use some other type of wire as a fuse, specifically buy that type of wire. If you use the legs off of 1/4 watt resistors, each batch/brand/ and or lot number may use a different type of wire that is still within specs for the resistor, but may be different type of wire and have differentfuse characteristics.

-Ryan
 

schmue

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Jul 16, 2018
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Thank you guys.
Found this little glass fuses
image_sxlhsk.jpg

I want to get max 50a outof each pack so in a 30p configuration, that is 1,6a per cell. Should I use the 2a fuse or 1.5?
 

Geek

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Aug 15, 2017
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934
schmue said:
Thank you guys.
Found this little glass fuses
I want to get max 50a outof each pack so in a 30p configuration, that is 1,6a per cell. Should I use the 2a fuse or 1.5?

Its up to you. Personally I would use 3a or even as high as5a. It is just to protect the pack in the event of a cell going short circuit. Or user error, if you short the pack while assembling it. If you go too small you will loose capacity to resistance in the fuses.
 
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