Resnik
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Post by Resnik on Dec 13, 2014 5:37:39 GMT
What size coil are you running? That would be bad @ 1.0 ohms, but not so bad at 0.2/0.3 ohms. Also Is your mosfet grounding out at the top metal piece or at the batteries maybe making contact to the box at the bottom on the negative side? Not sure if it would give an issue of being hot, but the only thing I know with mine is I make sure at both places nothing is making contact with the metal of the box and from your pictures you have posted you have the mosfet heat sink open.
I always take my heat shrink all the way up to the top past that heat sink so nothing makes contact. At one time or another I had auto fires with one or the other. Not saying you are having these issues, I'm just trying to see the differences between your build and mine.
Also the one you see with open copper wiring has rubber bed liner sprayed inside the box making the entire interior of the box non conductive.
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Post by Steve (VapeStorm) on Dec 13, 2014 5:49:48 GMT
What size coil are you running? That would be bad @ 1.0 ohms, but not so bad at 0.2/0.3 ohms. Also Is your mosfet grounding out at the top metal piece or at the batteries maybe making contact to the box at the bottom on the negative side? Not sure if it would give an issue of being hot, but the only thing I know with mine is I make sure at both places nothing is making contact with the metal of the box and from your pictures you have posted you have the mosfet heat sink open. I always take my heat shrink all the way up to the top past that heat sink so nothing makes contact. At one time or another I had auto fires with one or the other. Not saying you are having these issues, I'm just trying to see the differences between your build and mine. Also the one you see with open copper wiring has rubber bed liner sprayed inside the box making the entire interior of the box non conductive. 0.1ohm dripper, I havent Installed It in the box yet, waiting to get it drilled. So at the moment theres nothing to short on. Glad i tested before install. Once its working ill insulate the rest of the mosfet
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Resnik
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The Bearded One
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Last Online Nov 15, 2015 18:13:13 GMT
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Post by Resnik on Dec 13, 2014 6:04:29 GMT
Well although mosfets can handle low ohm builds its not recommended. Most people recommend 0.5 ohms and higher with a mosfet. I'd say try it at a .5 and see how it does. I never build below .2 so I can't really say how it does at .1.
Have you checked the 510 with the RDA off. See what kind of voltage your getting across the center pin and base. Make sure there is not something maybe making a dead short once the atomizer is on.
Looks like you have a FDV V4 510 there. I know one time I had got a little piece of kanthal right beside the center pin and when I put an RDA on it shorted out but was clear with the RDA off. Lol took me a bit to figure out what was going on.
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Resnik
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The Bearded One
Joined:November 2014
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Recent Posts
Last Online Nov 15, 2015 18:13:13 GMT
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Post by Resnik on Dec 13, 2014 6:18:28 GMT
When I build a mosfet build I do it in series anymore. Since I try and stay at .3 and higher with a mosfet (most of the time .4/.5) when its in series at 8.4v the coil gets just as hot as if I was running a .1/.2 ohm at 4.2v parallel.
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Post by Steve (VapeStorm) on Dec 13, 2014 7:03:25 GMT
Just put my kayfun on it @.65 and it works perfectly. Not the function Im building it for but its a start.
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VapingBad
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Post by VapingBad on Dec 13, 2014 11:07:14 GMT
Nice one Resnik. Could use 2 MOSFETs Steve (VapeStorm) link I guess that should handle twice the power. I was surprised that you have this prob as isn't the one you have rated at 195 amp, you live and learn.
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robby
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Post by robby on Dec 13, 2014 11:09:41 GMT
Have you tried heat sinking it? You dont want to be using the chassis or there is gonna be something poking through but with that current load, I would have thought it needed some heat escape, but see disclaimer below
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Post by Steve (VapeStorm) on Dec 13, 2014 11:13:29 GMT
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VapingBad
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Post by VapingBad on Dec 13, 2014 11:20:21 GMT
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Post by Steve (VapeStorm) on Dec 13, 2014 11:23:12 GMT
Been working on it since 8 this morning, managed to drill it out myself, checked it before I installed everything. Finished it went to vape and nothing..... :/ seems I may have broken a connection while manoeuvring the wires around.
Bugger.
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Post by Steve (VapeStorm) on Dec 13, 2014 11:24:07 GMT
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VapingBad
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Post by VapingBad on Dec 13, 2014 11:27:40 GMT
Looks good. Shame you broke it already
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Post by Steve (VapeStorm) on Dec 13, 2014 11:34:13 GMT
Looks good shame you broke it already Thats what I thought....... I just put fresh battery In it obviously the voltage was too low for the mosfet
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robby
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Post by robby on Dec 13, 2014 11:34:42 GMT
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Post by Steve (VapeStorm) on Dec 13, 2014 11:41:42 GMT
Scratch that. Its fooked and took a battery with it
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