Regulated mod amp draw (watt mode)

[Matty316]

I been noticing some confusion from people latley on how to calculate amp draw with regulated mod using wattage mode. Some using coil resistance, some using watts and battery voltage but not factoring in mod efficiency. So I came up with this equation so people can accurately calculate amp draw while also factoring in mod efficiency.

I = amps
P = watts used
V = battery voltage
M = mod efficiency percentage

Hope this comes in handy

Of corse you could just use steam engine .

 

[zoiDman]

Thanks for Posting this Matty. Two notes I would make on the Formula.

One is that the 100 in the Numerator is a Scalar to account for a Percentage being used for "M". So if a Decimal Value is used for the Mod Efficiency, then the 100 would Not be Used.

The Other is that since the Battery Voltage is in the Denominator, the Maximum Amps occurs when the Battery Voltage is the Smallest.

This is Kinda Counterintuitive. But to Calculate Maximum Amps, a user should input the Lowest Battery Voltage that a Mod can use Before it Shuts Down and will Not Fire.

 

[Eitje]

Just one thing: Where do I get my mod efficiency M? (Beside fiddling around with a multimeter, trying to work it out)

 

[zoiDman]

Just one thing: Where do I get my mod efficiency M? (Beside fiddling around with a multimeter, trying to work it out)

Sometimes the Mod maker will say what the Efficiency is for a certain Model on their Website.

And the Board's OEM will Almost Always have it in their Spec Sheet. Here is an Example...

http://www.evolvapor.com/datasheet/dna200.pdf

 

[IMFire3605]

Good explanation Matty, yet, even if you wanted to be 100% accurate, yes you add in mod efficiency, yet I try to prefer to use the simplest of math formulas, even with efficiency in the mix, lowest battery voltage, the mod is still going to pull that from the batteries, so if I state it as I=P/V. Reasoning, even if with efficiency is 10% over what is actually happening, that 10% the limit pushers are not thinking that have that extra 10% to play dangerously with. 20amp battery, at 100watts, though the calculation is a full 20amps though reality they may be pulling 18amps, they think they are pulling the full 20amps already, giving at least 2amps safety room they don't realize they have. Trust me, working in a Vape Shop you don't realize I have at least 2 customers in the 18-25yr age bracket come in pushing above the limits of things as it is, if they knew they had that extra 2amps to max out, what you think the recipe for disaster would be with that?

 

[Ryedan]

Of corse you could just use steam engine .

I like the Steam Engine battery drain calculator for this . Plug in the regulator efficiency or just leave it at 90% and enter battery volts and mod watts and you've got the answer.

This way you can also easily play around with battery voltage and atty ohms and see what happens when they change.

Works for me

 

[sonicbomb]

I love the smell of maths in the morning, however I just use the steam-engine calculator.