what size hammond box

[lalemandrew]

I'm trying to see what size Hammond box I need for the Lipo batteries to fit

[blueridgedog]

What lipo are you contemplating?

[lalemandrew]

Idk what are good ones with good day worth of heavy vaping

[blueridgedog]

I think you have to commit to a lipo size based on your vaping style.  I get buy on a 1,000mAh pack.  If you think you can do the same, then look at the hammond build in the thread on this forum about builds.

[blueridgedog]

There are some near ideal hammond builds in this thread:

https://forum.evolvapor.com/topic/65689-topic/

[lalemandrew]

What c do I need 30c or 50c and what does this matter

[blueridgedog]

The chip requires a maximum input of 23amps.  A 1000 mAh or 1Ah pack would then need to be rated at 23c to achieve this, but have no margin of error.  C is for capacity and the rating is the multiple of the the capacity that it can be discharged at.  So a 1000mAh pack rated at 10c would be able to sustain 10 amps (1000mAh = 1Ah, 1Ah * 10 = 10Amps).

So, as the capacity of your pack goes down, you will need a higher C rating to cross the 23amp minimum.  A 2000mAh pack can be solved with 2Ah * X = 23A or 11.5 C.  For a smaller pack, say 850mAh the math is .85Ah * X = 23A or .85 * X = 23 so X=27.06.  In each case I would go for a 20% margin of error (increase in C rating of the pack).

A fast way to do this is to simply know that your pack in Ah ratings (1000mAh is 1Ah) should be greater than 28  (23 plus a 20% margin) when multiplied by its C rating.  So a 1300mAh pack with a 20 C rating gives you 1.3 * 20 = 26 sustained amps and would be rejected (below the margin), but a 40 C pack of the same capacity would give you plenty of amps.

If you post the mAh rating you are considering, a minimum C rating for that pack can be suggested.

[lalemandrew]

2200 or a 5000

[blueridgedog]

Any C rating over 20 for a 2200 pack would be fine.  A 10 C rating on a 5000 pack would give you 50 amps, so more than enough.  Most packs you find in the upper mAh ratings will be well outside of the rating.

[lalemandrew]

50 watts but I wanna cvape at 200w or doesn't that matter

[Tomr1088]

He meant 50 amps

[lalemandrew]

What type of adapter head do I need on battery to be able to hook it right up

[lalemandrew]

Will a 2200 mah with 20c work fine

[Gm111]

lalemandrew said:

Will a 2200 mah with 20c work fine

Yes the equation you need to work out is Mah * capacity / 1000 = amps Soo 2200 * 20 / 1000 = 44 amps

[Gm111]

lalemandrew said:

What type of adapter head do I need on battery to be able to hook it right up

Anything rated over 23 amps, an XT30 is ideal for positive and negative but you will need the jst-xh balance plug on it

[lalemandrew]

Can I take off buttons and wire them to another location so it isn't all on the board and side like others

[blueridgedog]

The are solder points for off-board buttons and I believe you can remove the on-board ones carefully.

[lalemandrew]

How do you fasten the board to side of box or on battery?

[blueridgedog]

lalemandrew said:

How do you fasten the board to side of box or on battery?

There are several examples on this forum.  The fall into either using three tube standoffs of some sort or a plastic bezel.