advice for first diy box

[Kurt0402]

hi guys, im looking at making my first box, going for a parallel triple 18650 and have a few questions, firstly this is the material list im looking at
-1590B hammond box
-magnets for lid and case
-3034 mosfet
-fat daddy vapes v4 510 connector
-3A 16mm push button switch
-volt reader/display
-wire (not sure what type i will need, i was looking at copper 14awg wrapped in silicon but not sure, if you have any help with this is would be awesome)
-master on of switch
so my few questions are
-firstly is there any drawn up schematics for this type of box?
-do i NEED fuses? because i know if i have 3 vtc4s ill have a max current of 90A and at a voltage 4.2v thats roughly 0.05 ohm lowest build, which i doubt i would even do, even on 3 20amp continous batteries it would be 0.07 which is kind of the minimum builds ill be doing anyway, especially as ive heard the unreliable nature of most "vtc4's" out there at the moment, so basically what im asking is if im making sure i know the resitance of my coils and im making sure to not exceed the max of the batteries and i make sure my batteries are in the right way and all that, do i need to use a fuse ?
- what type of wire will i need for wiring to each component?
and lastly, what kind of on of switch should i be using ?
any links linking to exactly what your answer is would be awesome
thanks in advance

 

[Kurt0402]

also, can i use 14awg solid copper wire ? and heat shrink around the outside ?

 

[Visus]

A fuse on each cell is highly recommended as it stop shorts by the batteries themselves if one cell goes kaput the other cells will charge it @ whatever rate their pulse discharge is so that can be up to 200amps and ya great big kaboom..

Solid gauge is fine you can use 10, 12, 14 up to 18 ga and be fine at those amps.. Because of the short runs 18ga will do but will offer a small resistance 14 is good 12 better bests..

If you do it neatly and everything is 100% secured down you do not need shrink wrap but if not and unsure yeah use it.

Example: 14ga solid

 

[Nightly_Paradox]

Do you need fuses? no, I left them out on my build because fuses add resistance reducing your overall power, but they do provide a little protection.

Wire? 14 gauge on the high current sections, and 20-22 gauge on the low current sections. Infact if you use 14 gauge with the FDV V4 510 you will have to remove a few strands on the striped end to get it to fit into the center pin.

Switch wise won't matter as long as you can get it to fit since it will be mosfet protected. Even with the on/off, you can use whatever you have laying around. For example the next box I'm going to build I'll be using a 3 pin 2 position switch I salvaged from an old AM/FM radio to control my volt meter.

Solid wire? Yes you can use solid core wire, my next build will be done in solid core 14 gauge wire on the high current sections.

This is my series box I had redone using stranded wire on everything.

It's not bad, but on the next build I'm using the solid core to clean it up some.

Sent from my Nexus 5 using Tapatalk

 

[Zanderist]

A fuse on each cell is highly recommended as it stop shorts by the batteries themselves if one cell goes kaput the other cells will charge it @ whatever rate their pulse discharge is so that can be up to 200amps and ya great big kaboom..

Solid gauge is fine you can use 10, 12, 14 up to 18 ga and be fine at those amps.. Because of the short runs 18ga will do but will offer a small resistance 14 is good 12 better bests..

If you do it neatly and everything is 100% secured down you do not need shrink wrap but if not and unsure yeah use it.

Example: 14ga solid

I saw that picture on tap talk and will have to say the wiring looks beautiful on that piece.

Sent from my SAMSUNG-SM-G900A using Tapatalk

 

[EverPresentNoob]

I realize this is an old post, but one thing you didn't mention in your parts list was the resistor for your Fet...