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

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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

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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?

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