What I would do differently..

ozz93666 said:
With this fire thing we are totally in the realms of fantasy ...

No one has yet demonstrated it's possible to start a fire with a 18650 in normal operation

You may remember I offered a $1,000 prize to anyone who could start a fire using UNFUSED 18650's in a powerwall and make a video of this.

Most people here fuse every cell and are still scared of fire !!! Ridiculous ...

Same with "double fusing" ....irrational ...illogical ...ask any electrical engineer
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"normal operation" is not the situation I add fuses for. I add them to save me from my own screw-ups during handling - which happens often enough that it's worth my while engineering for it.
 
Fusing isn't for "normal operation". If a device worked normally, and there were never outside interventions, then there would never need to be fuses on anything.

However, they are for the "unknown" event of things. We aren't just fusing for fire only when a cell dies. We are also fusing for fire when something external causes a short that either heats up a cell to failure, gets the metal hot enough to ignite stuff or severely burn someone/something and to protect other hardware from getting torched. Also, from other hardware from torching the cells if "it" fails.

Overkill, perhaps. To keep from possibly getting killed, definitely
 
R.Mitchell said:
If you don't have a building up yet, you might consider brick walls. You could then use hbpowerwall's pack holders with no issues.
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Or use ytong
 
Fuses have saved me from my self... i need one for real life - Start saying something to the wife I shouldn't fuze breaks - wife isn't unhappy.
 
hbpowerwall said:
it is correct for my use, always best to check for yourself and everyone's needs are different.
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I am curious why you would use a 20 AWG tinned-copperwire that has a fuse rating around 58.6 Amps and a normal current rating of 5 Amps.

I am planning on using a 34 AWG copper wire for a fuse because the fuse rating is 5.1 Amps.

Am I not understanding something or are you using the 20 AWG to fuse something other than 18650's to a bus bar?
 
hbpowerwall said:
I use http://amzn.to/2uT4kGr for fuses and the ground wire out of house wiring for my negitive
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so you use a nearly 60 amp fuse on the positive side ofeach 18650? The link is to a 20 AWG wire. I am curious about why you would make that choose to do it this way. I am new to this and trying to understand what mistakes not to make in my design. My thinking is that by using a 34 AWG wire fuse if any individual cell tries to pull more that 5 amps it will blow, but using a 20 AWG would require nearly 60 Amps to blow. Am I wrong in my calculations?
 
all of my testing shows it blows at 6amps Average Joe tested again at 18amps
I've blown a bunch of fuses on my setup and I'm happy to use them
 
hbpowerwall said:
all of my testing shows it blows at 6amps Average Joe tested again at 18amps
I've blown a bunch of fuses on my setup and I'm happy to use them
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That's interesting. I'm just wanting to make sure that when i build my PowerWall I use the right size fuse wire.
 
Hence everyone is encouraged to do their own testing.. maybe i was wrong but it seems to work well for me so far :)
 
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