Voltage and amps and Wattage

[ugothakd]

What's the difference between vaping at 3.7v and 30amps for 110 watts compared to 7.4v at 15amps at 110watts? My current setup is a single 3.7v 30amp 18650, but what's to stop me from doing three series 18350s at 11.1v 10 amps to get 111 watts?

 

[eyerhere]

ru7nning batteries in series can greatly increase your chances for battery fal\ilure. watts is watts so why take the chance.

 

[ugothakd]

My main problem is I need to regulate the voltage so there's no battery sag and there's nothing that'll regulate 30 amps that I can find. Can you point me to a dc/dc regulator that will make my batteries discharge a steady 3.7v that can handle 30+ amps?

 

[Norrin]

ru7nning batteries in series can greatly increase your chances for battery fal\ilure. watts is watts so why take the chance.

On a full battery he's running 35A so running the series is probably safer anyway. 18350s have less energy when they vent

 

[edyle]

My main problem is I need to regulate the voltage so there's no battery sag and there's nothing that'll regulate 30 amps that I can find. Can you point me to a dc/dc regulator that will make my batteries discharge a steady 3.7v that can handle 30+ amps?

The 30 amp rating is just what the battery can supposedly safely support; it does not mean that the battery always puts out 30 amps.

 

[ugothakd]

If I'm using sub ohm coils it will be pulling 30 though, and this is where the problem arises trying to make a sub ohm variable voltage box mod

 

[Susan~S]

Try browsing around the Batteries & Chargers Forum. Read all the "stickies". You will not be able to post over there until you get in your first 5 posts (and the server updates at :25 past the hour).

 

[edyle]

If I'm using sub ohm coils it will be pulling 30 though, and this is where the problem arises trying to make a sub ohm variable voltage box mod

volts = amps x ohms
if you make a 0.5 ohm coil
4 = amps x 0.5
amps = 8

You'll only be drawing 30 amps if your ohms goes down to about 0.13 ohms.

 

[edyle]

If I'm using sub ohm coils it will be pulling 30 though, and this is where the problem arises trying to make a sub ohm variable voltage box mod

when your post count reaches 5 or 15, go here
Battery Mods

 

[wshanncap]

Use this calculator to see what you are really running. Ohms Law Calculator

 

[dc99]

If your going for regulated you will have to use a chip of some kind. The new sx350 chip will do 100w. You can do an OKL or raptor chip and get past 100w but you better know what you are doing. Personally I wouldn't even consider 18350s. Stick with good 18650s. Something like this
http://www.e-cigarette-forum.com/fo...flip-top-vv-mod-20a-120w-dc-dc-converter.html

 

[ugothakd]

I've decided against regulated, I think. Quick question, if I rig up two 10a voltage regulators and have them set at the same voltage in parellel, will that allow me to pull 20 amps?

I'm thinking four 18650's in series, to two rda's in parellel. Is it safe to vape at 12 volts if I'm using high resistance and plenty of wraps? With that math I should be able to build down to .4 ohms, although I'll stay definitely above it.