So am I safe?

[xxrob511]

So heads up I'm still new at this I'm learning
So just picked up A Sony vtc5
From what I understand the battery has a 30 amp limit
Now I have one of the excel documents that someone posted on this forum
so 1/16 7 wrap 26 guage comes to 0.565
I used a ohm cal found online
I type in the volts and the ohms and it comes out to this

Voltage (E): 3.7 Volts (V)
Current (I): 6.54 amps (A)
Resistance (R): 0.565 Ohms
Power (P): 24.23 Watts (W)

so if it is only drawing 6.54 amps and the battery is rated at 30 this is a safe build am I right
or am I doing something wrong ?
could just proof read and tell me if it's good to go or no you need to fix this

 

[Singaw]

For a mechanical mod you should always use the voltage of a fully charged battery in the equation. So 4.2v or in my case 4.17v. Otherwise everything looks ok to me.

 

[Bunnykiller]

sounds about perfect given the numbers you supplied your at about 1/4 of the batterys limits

 

[Myrany]

Just something I do. I run my numbers at 4.2 volts which is what the batteries come off the charger as. Assuming the Amps do not shoot up over 30 (I personally wouldn't go over 25 for a safety margin) you should be fine.

 

[xxrob511]

Okay I will in the future put 4.2 in the Equation thanks

 

[xxrob511]

For a dual coil build do you add two times the amps?


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[FACE MEAT]

Dual coils act as resistors in parallel as opposed to series. Your ohm reader doesn't know or care how many coils you're running.

Plug in the resistance shown by your ohm reader. It's (relatively) accurate.

 

[Ryan Kelly]

For a dual coil build do you add two times the amps?


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nope. the ohms/resistance already takes into account both coils so the amp rating you get from your equation is the total. good luck

 

[Vaslovik]

No, you are not safe, none of us are safe, there's no such thing as safety, life is full of danger and anything can happen anytime. Aliens can invade, a monster asteroid can hit us, earthquakes, tornadoes, hurricanes, serial killers. All you can do about it is lock the doors and windows, crack open a beer, and vape.

 

[mujuru]

So heads up I'm still new at this I'm learning
So just picked up A Sony vtc5
From what I understand the battery has a 30 amp limit
Now I have one of the excel documents that someone posted on this forum
so 1/16 7 wrap 26 guage comes to 0.565
I used a ohm cal found online
I type in the volts and the ohms and it comes out to this

Voltage (E): 3.7 Volts (V)
Current (I): 6.54 amps (A)
Resistance (R): 0.565 Ohms
Power (P): 24.23 Watts (W)

so if it is only drawing 6.54 amps and the battery is rated at 30 this is a safe build am I right
or am I doing something wrong ?
could just proof read and tell me if it's good to go or no you need to fix this

I would not trust a spreadsheet for your ohms... Just because you did 7 wraps on a 1/16th with 26g doesn't necessarily mean you're at 0.565 ohms. If all things are perfect, etc.. then you'll likely be right in that neighborhood... BUT ALWAYS check your ohms to make sure you're at what you're supposed to be at. Your coils could be touching something... or something wonky with the particular piece of kanthal, etc..etc..etc... Yes, the spreadsheet helps you know what your target ohms will be... but it does NOT tell you what your ohms are actually at. Please be sure to check your ohms with a multimeter or ohm reader and do not trust the spreadsheet to figure out your ohms. What your ohm should be and what you're ohm is... is two completely different things...

But outside of that... you're good to go.

Please be safe and ALWAYS check your builds for shorts and make sure your ohms are what you intended...

Edit: oh... and as others stated above, use 4.2v in your calculations rather than 3.7v.

 

[D. Waterhouse]

Are you using a meter to get your resistance values? A spreadsheet will get you close but until you put a meter on it you don't know for sure. Your wire might have a different resistance value from the chart or you might have a short. When in doubt, always meter.

 

[Singaw]

I have to agree totally on using a meter. I would like to give an example of an error I made one evening that could have caused me plenty of trouble if I had not checked with a meter. One evening I was trying to hurry and do up a double coil of twisted 32g kanthal before going to bed but instead grabbed my 28g by mistake and twisted it. I don't remember exactly at this time but I think I ended up with a .4 ohm coil which was pushing the limit on my 10 amp battery. I had wrapped hundreds of coils but in my rush had not even noticed the coil was larger than normal and that the wire was thicker. Always check your coils with a ohm meter because you never know when that one error might cause you trouble.