Rather Strange but question important to me.

[kenny]

Slightly unusual I know, but my situation is that I use Kanger Subtank at present on a Vamo @ ~10watts (~1.5ohm) and get quite good Direct Lung inhales. However, the Vamo is failing, and I now have an Evic VTC Mini for which I have quite a stock of good quality 10amp batteries. I know ideally that I should buy ~30amp batteries for the Evic, but am not in a financial position to do so at the moment. My question is :- Is it possible that I can safely utilize the Temperature Control facility of the Evic using my existing 10amp batteries, or should I stay with Wattage mode?
Many Thanks for any input.

[VapingBad]

You should really stay < 30 W in both modes

[Bob]

Agreed 30w maximum in both Power & Temp modes, battery drain at that wattage is just under 8A and you need a bit of headroom.

[kenny]

Would you be good enough to explain how I would apply a 30W restriction when I am in Temp Control Mode on the Evic?

[monty]

I haven't seen an oscilloscope output for the Evic VTC mini, but some temperature control boards will output their maximum Watts until the coil is up to temperature.

[kenny]

Mar 28, 2016 11:22:19 GMT monty said:

I haven't seen an oscilloscope output for the Evic VTC mini, but some temperature control boards will output their maximum Watts until the coil is up to temperature.

So from this, can I assume that it would be dangerous to use Temp Control with the 10amp Batts?

[DiscoDes]

Mar 28, 2016 11:46:18 GMT kenny said:

Mar 28, 2016 11:22:19 GMT monty said:

I haven't seen an oscilloscope output for the Evic VTC mini, but some temperature control boards will output their maximum Watts until the coil is up to temperature.

So from this, can I assume that it would be dangerous to use Temp Control with the 10amp Batts?

You can set the wattage to 30W in TC mode on the Mini VTC so no issue there. Of course you will be restriced to TC coils like nickel, Titanium & Stainless Steel. So you can set the max watts and then just use the temperature sensing to set your vape.

I also use 0.5 ohm Kanthal heads in mine and get a very satisfying vape at around 15 watts.

I would say just don't do a very low ohm build in a RDA.

Once funds become available then I'd make it a priority to get some better batteries, you should be able to pick up a pair of Samsung 25R's or a pair of LG HE4's for £12 from Torchy on Ebay.

[kenny]

DiscoDes - Very helpful reply, and has added to my understanding a little more. I have on order some Stainless Steel for coils, and take on board what you have said about better batteries.

I didnt realise that I could set max wattage in Temp Control mode, as I have only just received the Evic and not delved into the instructions. Maybe it will become clearer when I do, but in the meantime, due to the helpful info here, I feel able to at least try the Temp Control in relative safety.

Many Thanks.

[nanotm]

kenny

yeah the evil mini is quite versatile in that regard some of the other mods don't offer the same limiting feature although for low wattage tc mods the dovpo forever 30 is quite good especially if you can find them on a sale (I picked up one for under £20 around Christmas time)

as to the batts this is a good place to get them from puremist.co.uk/ecigarette-accessories/pure-mist-batteries/2-SAMSUNG-25R-INR18650-25R-2500mAh

and unless your in the highlands or islands they offer free shipping as well which makes them excellent

[kenny]

Many thanks to all who replied. Such good people in this forum.

Anyway, to explain a little more.

My initial thought was that as I really need to use my existing 10amp batts (which I have quite a stock of) I would stick to fairly low res coils ~1.5ohms which to be honest, I am fairly happy with most of the time. However, as I have an Evic with TC, I would love to just try TC at my present vaping levels and see if it would improve vape quality. Maybe I am not understanding something basic, (which is likely due to advanced age) but my fear was that bearing in mind a 30watt safe vaping limit with these batts, if I used TC mode, then the mod would maybe draw more current initially than is safe, before the TC had a chance to kick in.

Once again, many thanks for any further guidance.

[tim]

Mar 29, 2016 2:07:29 GMT kenny said:

Many thanks to all who replied. Such good people in this forum.

Anyway, to explain a little more.

My initial thought was that as I really need to use my existing 10amp batts (which I have quite a stock of) I would stick to fairly low res coils ~1.5ohms which to be honest, I am fairly happy with most of the time. However, as I have an Evic with TC, I would love to just try TC at my present vaping levels and see if it would improve vape quality. Maybe I am not understanding something basic, (which is likely due to advanced age) but my fear was that bearing in mind a 30watt safe vaping limit with these batts, if I used TC mode, then the mod would maybe draw more current initially than is safe, before the TC had a chance to kick in.

Once again, many thanks for any further guidance.

Hi kenny,

the info you have already been given is almost certainly correct. But, if you still feel worried about trying TC with your existing batteries, please wait until you can afford some higher amp rated ones. It is, after all. your face/hand/pocket which will be affected if the advice is proved incorrect.

All said, save up for better batteries, and keep the 10amp ones for higher ohms.

Safety is the main issue when it comes to batteries. If you are not sure, DON'T DO IT!

[kenny]

Have taken onboard all helpful advice, and will get some suitable batteries in the future. VTC Mini has proven to be faulty, so makes it all a little irrelevant for a while anyway.

Thanks again anyway.

[VapingBad]

With VV & VW mods the current at the coil and at the battery will be different, the current from the battery will be dictated by the watts set & the voltage of the battery. There is up to a 10% loss of efficiency in the conversion so you need to factor in some head room.

EG is set to 30 W the board needs about 33 W, when the battery is full (4.2 V) it will draw 7.9 A, when it is low (3.3 V) it will draw 10 A.

At the coil side that 30 W could be at many voltage and current values EG:
for 0.2 Ω it would be 2.45 V at 12.24 A,
for 0.5 Ω it would be 3.9 V at 7.7 A and
for 1.0 Ω it would be 5.5 V at 5.5 A,
but they would all draw the same current from the battery.

[smarties]

That's interesting VapingBad I really hadn't thought of it that way...doh, so you're saying that at a set wattage the battery draw is constant in amps and the board fiddles about with voltage and current depending on the build, I think..., have I got that right?

[VapingBad]

Mar 30, 2016 10:56:20 GMT smarties said:

That's interesting VapingBad I really hadn't thought of it that way...doh, so you're saying that at a set wattage the battery draw is constant in amps and the board fiddles about with voltage and current depending on the build, I think..., have I got that right?

Yes constant with the wattage, although to be fully correct the battery voltage will sag a little while it firing.