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Voltage drop
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Don Offline
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Post: #1
Voltage drop
Got an inline voltmeter so can now measure voltage under load. Which has already led to my Hammer's 510 spring getting a lot of fine copper wire stuffed into it. Which got the voltage drop to about the same as the rest.

Same cell, same atomiser used for the under load tests. The atomiser is an 0.6 ohm Prometheus dual coiled and dual wicks.
JM22 clone - battery voltage 3.78
           load voltage     3.33
           voltage drop 0.45V

Hammer clone - battery voltage 3.77   Modded to get it down from around 0.9V
           load voltage     3.40
           voltage drop 0.37V

Myth clone - battery voltage 3.76
           load voltage     3.08
           voltage drop 0.68V

Natural clone - battery voltage 3.77
           load voltage     3.38
           voltage drop 0.39V

GG TS clone - Battery voltage 3.80
           load voltage     3.38
           voltage drop 0.42V in 510 mode. Probably a lot less in hybrid mode

Private V2 clone - Battery voltage ... Can't get meter to contact due to wrecked threads on Private.
           

TVF tested battery info to be found here

http://www.preventsuicideapp.com

[Image: 24291313393_16615b20b2_m.jpg]
15-03-2014 01:58 PM
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apt323 (03-19-2014)
18sixfifty Offline
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Post: #2
RE: Voltage drop
Nice info, thanks. 

Another thing I have always wondered is how bad battery sag is with multi-coil units and how bad it hammers our batteries. I know they already take a beating with low oHms. Anyway to test that? 

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15-03-2014 02:32 PM
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apt323 (03-19-2014)
Don Offline
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Post: #3
RE: Voltage drop
I suppose I could measure current draw at the same time. These were all done with the same Sony VTC4 cell and the same atomiser (0.6 ohms) in order to minimise variation. The VTCs are among the least saggy of cells so the variations are hopefully due to the mod. That atomiser (Gords' Prometheus) is drawing around 6A when firing so around 20W. I reckon you'd need something like a DNA chipset or one of the new high-power devices to get better data.

TVF tested battery info to be found here

http://www.preventsuicideapp.com

[Image: 24291313393_16615b20b2_m.jpg]
15-03-2014 03:31 PM
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gords1001 Offline
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Post: #4
RE: Voltage drop
I suspect the volt meter may be affecting readings too, their all worse than my private v2 read under a .3ohm load with Samsung inr18650 15m cells.

I took my readings by sticking the meter probes on the atty terminals then pressing down to fire.
15-03-2014 07:11 PM
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Don Offline
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Post: #5
RE: Voltage drop
That'll probably only work properly with a single coil. Doing that with the Prometheus on the Natural. Vbatt 4.01, V across 1 coil 3.16. I'd need something to contact both - terminals and another to the +.

The dripper wedged onto my Private with knackered threads and an 0.5 ohm coil. Vbatt 4.18V Vfiring 3.79 or 0.39V drop which is pretty good for an 0.5 ohm load.

TVF tested battery info to be found here

http://www.preventsuicideapp.com

[Image: 24291313393_16615b20b2_m.jpg]
15-03-2014 07:19 PM
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gords1001 Offline
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Post: #6
RE: Voltage drop
Could be, the way to negate that would be to touch the probe on the deck and see if there's a difference. There shouldn't be as the coils are in parrallel.
15-03-2014 07:28 PM
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Don Offline
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Post: #7
RE: Voltage drop
3.3V under load from the deck. Should have thought of that myself.

I think the Samsungs have lower internal resistance than the VTC4s according to the FT forums

But the Prometheus continues to wick fine with 80%VG at 12mg.

TVF tested battery info to be found here

http://www.preventsuicideapp.com

[Image: 24291313393_16615b20b2_m.jpg]
15-03-2014 07:35 PM
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gords1001 Offline
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Post: #8
RE: Voltage drop
Possible. They suprise me how little they sag. Sounds like the prometheus is getting thoroughly tested lol
15-03-2014 09:05 PM
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Don Offline
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Post: #9
RE: Voltage drop
I certainly do. Time to rewick and recoil the Kraken or the Pulse, but the Kraken has better air holes. I'll try the traditional mesh and round wire aiming for around half an ohm. With 12mg juice lung hits should be an option.

TVF tested battery info to be found here

http://www.preventsuicideapp.com

[Image: 24291313393_16615b20b2_m.jpg]
15-03-2014 10:52 PM
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gords1001 (03-15-2014)
apt323 Offline
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Post: #10
RE: Voltage drop
Thanks for the info don!

This might be a dumb question but, when calculating watts for instance is it calculated with the voltage when resting or is it during load?


JM22

Resting - 23.8 watts and 6.3 amps
Loaded - 18.5 watts and 5.5 amps

Good
19-03-2014 04:21 PM
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