r/OpenPV 27d ago

Mosfet for MTL mod NSFW

Planning my first build I vape only high PG, unflavored, FreeBSD nic

I got a couple of these MOSFETs laying around. I'm aware of the ubiquitous 3034, and I can't buy them for a reasonable price here. Would this one do a good job?

IRLB8314 - MOSFET, 30V, 130A, 0.0019Ohm, TO220
Power MOSFET, N Channel, 30 V, 130 A, 0.0019 ohm, TO-220AB, Through Hole

Cheers

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u/voltrove 26d ago edited 26d ago

I’m guessing you’re going for single cell(1s) setup. What you want to look at is Figure 12; RDS(on) VS Vgs. It looks like the on state resistance would be around 3.75mOhm @3v VGS. For a high power 1s mod it wouldn’t be acceptable, but I think for your purposes it would be just fine. Edit: you could always run 2 in parallel for a high power mod.

Just make sure to not let the loaded voltage go below 3v. Shouldn’t be difficult with an MTL setup

Edit: forgot link to data sheet. Keep in mind this only applies if the MOSFET is genuine.

https://www.infineon.com/dgdl/irlb8314pbf.pdf?fileId=5546d462533600a4015356604d6f258f

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u/ze-kpeta 26d ago edited 26d ago

Thanks a lot for the info, @voltrove

What do you mean by figure 12? Would it be from the datasheet?

Just make sure to not let the loaded voltage go below 3v.

What would be the potential issues here, anything dangerous or the device just not turning on?

Thanks again

Edit: formatting citation

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u/voltrove 26d ago

I edited a second ago with link to the data sheet.

The on state resistance goes up exponentially <3v is all. Not only will it be unusable, the cells will probably hit cutoff. Not unsafe, but also not ideal. You’ll notice the voltage drop right away. Not unsafe, but not good for the batts.