Wood dual 18650 glass fuse build

[ceeje]

hello fellow vapers. As you already know im very new to this forum, but not so new to vaping. ive created my own box, and hopefully i can get some veteran members to review my work. I appologize now for my posting in the "ask the vets" forum as i was trying to get valid input on my build.
now that thats out of the way.. this is what i have in my box.

the fuses are 15 amp 32VAC glass fuses.
switch is 3v. i threw away the packaging for it i dont know the amp limit on it.
mosfet is a irlb3034pbf T-220, i ran a 15k ohm 1/4watt resistor across the gate and source pins.
the battery sled is keystone. either 1048 or 1049 whichever has the copper contacts.
i also dont know the rating of the master on/off switch. (threw away packaging)
the 510 is a varitube 22 mm self adjusting connector
the batteries.--dual samsung INR18650 25R
i ran 16awg wire and 20awg wire throughout this build.

red is 16 gauge
red/blue is 16 gauge (not to be confused to which pin its wired to)
green is 20 gauge


i really only have a couple questions...
1- theres no washer between the wood and the soldered connction for the 510. (the connection i used is the one that came with the varitube connector) Is it making a good ground for the connection?
2- these fuses, are ran in parallel? are they protecting my build at all?
3- how low am i safe to build to? what ohm level. i suspect its around .2 but not sure...
4- Any opinions? ) how you like?

 

[Quigsworth]

Fuses in mods are meant to protect your conductors 1st, the batteries 2nd (batts can get hot but if the insulation melts off the wires and start shorting, things go south real fast). The way you have your fuses set up, while I can understand would seem logical from a 1 fuse per battery idea, but in reality it's not good.

In the event of an over current situation (and somehow the fet doesn't pop) each fuse would allow 15A per battery (or 30 amps total) to flow in your 16 awg pos conductor which can only handle about 15A (free air rating)...30A would cook the insulation off the positive conductor good and the fuses could technically hold.

No shame, parallel circuits can be tricky to visualize...quick and dirty fix, change your fuses to 7.5A's or an even better fix, joint the batt positives together before the fuse block and run through just one 15A fuse (it blows, everything stops)

Nice work on the box btw.

 

[Mooch]

Just my personal opinion, but I'd like to see a fuse used on the positive of each battery to protect against one battery being put in reversed and short-circuiting the two of them together.