BJ Box Mod

[BananaSammiches]

So, I've got a BJ Box Mods series box with PWM, MOSFET safety and voltage control dial. My question is, does anyone know the lowest resistance that will work on this thing? Like, I understand that you shouldn't go below .3 on a series box, however, if I dial the voltage back to 50% power instead of 100%, which would be the full 8.4 volts, would a lower resistance technically be fine? I'm pretty experienced when it comes to series builds, but this is the first time I've used a mod like this. Can anyone provide some insight on this. Thanks!

 

[PaulS]

Generally the PWM series mods do not function well below .25 ohm. The mosfet will not handle lower if you are not careful.

 

[BananaSammiches]

Generally the PWM series mods do not function well below .25 ohm. The mosfet will not handle lower if you are not careful.

Okay, cool. Thanks, man!

 

[nlt2836]

A MOSFET is not for safety, a MOSFET is merely a switch. It is in the box mod to allow the use of a low amp switch for the firing button.

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[nlt2836]

Use ohms laws to calculate the allowed amperage by inputting the voltage you have your box set at and the resistance of the coil you have installed. Do not build for more than the battery you have installed can handle.

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[BananaSammiches]

Use ohms laws to calculate the allowed amperage by inputting the voltage you have your box set at and the resistance of the coil you have installed. Do not build for more than the battery you have installed can handle.


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Yeah, I'm already aware of how to calculate the allowable amperage based on the resistant of the coil and the voltage. You didn't really answer my question. My question was, if I used the voltage control dial on the mod to turn down the power, can I run a lower resistance build on it?

 

[nlt2836]

When you use the dial you are changing the voltage. That is the voltage use you for your calculations, not the 8.4 volts of the system. The allowed amapacity is that of the battery. It does not change with the dial. So if your batteries are rated at 20 amps. That is your limit. And that doesn't double because you have 2 batteries in series. I hope this explanation helps more.

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[BananaSammiches]

When you use the dial you are changing the voltage. That is the voltage use you for your calculations, not the 8.4 volts of the system. The allowed amapacity is that of the battery. It does not change with the dial. So if your batteries are rated at 20 amps. That is your limit. And that doesn't double because you have 2 batteries in series. I hope this explanation helps more.

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You kind of did, but you also keep telling me things I already know, lol. I know that the amperage ratings of the batteries doesn't change when adjusting voltage. Maybe I should've been more specific in my original post. So, if I understand this correctly, if I dial down the voltage, I can use a lower build.

 

[PaulS]

There is a common misconception that needs clarifying at times ...

Parallel - doubles amperage and MaH
Series - doubles voltage

A series box will blow the switch if you build too low and set the PWM too high. I've seen it a number of times. Vape safe. With a PWM there is no need to build low.

 

[HondaDavidson]

With a lower ohm coil you would be required to reduce volts. In order to not have the amp draw go to high. Good thing is that the lower you go on ohm the fewer volts you need to produce wattage. But the lower you go ohm wise and higher volt wise the more amps you pull.

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[BananaSammiches]

There is a common misconception that needs clarifying at times ...

Parallel - doubles amperage and MaH
Series - doubles voltage

A series box will blow the switch if you build too low and set the PWM too high. I've seen it a number of times. Vape safe. With a PQWM there is no need to build low.

I believe that I clarified in my original post that I've used a series mod before, but I should've been more specific and clarified that I've just never used one with PWM. I do know the difference between series and parallel, lol. I only needed the question that I asked answered, but thanks.