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19" DIY Power Packs
#21
(08-13-2018, 03:09 AM)Riplash Wrote: And will they will be 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?
Running off solar, DIY & electronics fan :-)
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#22
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?
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#23
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.
Running off solar, DIY & electronics fan :-)
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#24
(08-26-2018, 08:02 PM)schmue Wrote: 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 fuses by specifying the wire.  What I mean is  if you want to use 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 different  fuse characteristics.

-Ryan
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#25
Thank you guys.
Found this little glass fuses
I want to get max 50a out of each pack so in a 30p configuration, that is 1,6a per cell. Should I use the 2a fuse or 1.5?
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#26
(08-28-2018, 04:52 AM)schmue Wrote: Thank you guys.
Found this little glass fuses
I want to get max 50a out of 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 as 5a. 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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#27
Hello guys, Thanks for sharing these ideas. It's helped me a lot.
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#28
Hi guys, it has been a while but today my proof of concept went to the next level.

AaronM and RikH like this post
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