I was trying to read up on some topics, but the ones I have read make it a little confusing. 1 Battery with an amp drain of 20. Does getting a regulated box mod (Snow Wolf) increase the maximum amp drain? Does a regulated box mod with 2 18650 batteries allow me to build lower ?
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Multiple batteries increase amp drain ?
- Thread starter Hamajang
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NemesisVaper
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No, you don't double the amp limit in a Snow Wolf because the cells are wired in series.
On a mech in series you have double the voltage. This means you can build 4 times higher resistance coils, get the same wattage and half the amp draw.
Wired in parallel you theoretically get double the amp limit. In practice this isn't wise, and 1.5 times the amp draw is more realistic.
A regulated box mod will allow you to build as low as the makers decide. Your atomiser resistance doesn't matter because the atomiser never touches the batteries. The atomiser is connected to the board, and that is what fires your coils. The batteries are powering the board, which exchanges voltage for extra amperage.
You can build lower on a parallel mech. On a regulated you can build up to the specification and don't need to worry about how it's wired as long as you use good cells.
On a mech in series you have double the voltage. This means you can build 4 times higher resistance coils, get the same wattage and half the amp draw.
Wired in parallel you theoretically get double the amp limit. In practice this isn't wise, and 1.5 times the amp draw is more realistic.
A regulated box mod will allow you to build as low as the makers decide. Your atomiser resistance doesn't matter because the atomiser never touches the batteries. The atomiser is connected to the board, and that is what fires your coils. The batteries are powering the board, which exchanges voltage for extra amperage.
You can build lower on a parallel mech. On a regulated you can build up to the specification and don't need to worry about how it's wired as long as you use good cells.
NemesisVaper
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It sure can. It's not a nice experience with all that pulsing either
. Better than the IPV3 Li though, they let you upgrade to 200W. As far as iI knowthere's no pair of cells in the market to cope with the amp draw from that.Two 18650's in series that are supplying 8volts to the chip make 200w with 25amps.It sure can. It's not a nice experience with all that pulsing either
It sure can. It's not a nice experience with all that pulsing either
7 volts max output was the spec I was looking at. 30 amp cells can supply ~ 210 watts total, leaving very little headroom.
NemesisVaper
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They do indeed. However, as cell voltage drops, amp draw increases, so at the cutoff voltage of 6.4V you'd be drawing 32A. That's assuming the mod lets cell voltage get that low. Ok on fully charged 25-30A cells but as it's used you'll drop out of the "safe" zone.
Not as much of a problem as being over the amp limit on a mech as you have a slew of protections on your side. I just don't feel completely comfortable with them selling something that actually needs a 32+ amp cell with low cell voltage. As we all know, any cell claiming more than a 30A CDR is probably a lie. 25R may take the strain, and if I were to run 200W then that would probably be the cell I'd use.
None of this applies of course if the person won't take the mod that high, in that case choosing a cell that has the highest capacity for the amount of amps they will draw is the important thing.
Does anyone have any links to info/graphics regarding batteries in series vs parallel, different cell types (18650,350,400, lipo etc)? looking to build my own mod, want to do it safely and with optimal battery config.
NemesisVaper
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Not seen one.
Couldn't tell you much about lipo but if you have the max wattage output of the chip and the voltage at which it stops firing you can work out what is safe.
Worst case amp draw:
Take the max wattage and divide by the minimum cell voltage. Times the result but 1.05-1.1 k depends how much headroom you want) to account for board inefficiencies, and that gives the max Amp draw.
Eg, Sigelei 100W is 100/6.4*1.1= 17.2A max.
Thanks, I appreciate the help.