DNA 200 Watt

[dwcraig1]

I used an online ohm's calculator and used figures from farther down the sheet and it was within .1 watts of the 28 set watts doing it three ways so it looked pretty accurate to me, I figured the calculator was doing some slight rounding of the figures giving a slightly different answer.
Here is the line from the spreadsheet that I used:
6.58 amps - 27.93 watts - 28 set watts - 0.355 cold ohms - 0.646 hot ohms - 412.56 firing temp - 450 set temp - 4.26 volts

 

[AtmizrOpin]

What's the dna battery settings from evolv, what's it set to from the factory? watt hour, mah, cut off voltage, etc.

 

[dwcraig1]

What's the dna battery settings from evolv, what's it set to from the factory? watt hour, mah, cut off voltage, etc.

The settings for the battery are suppose to be done by the mod's maker, or do you mean the settings for the 900 mah lipo that Evolv sells?
Battery charge can be set to stop at 4.1 or 4.2, the battery curve only affects accuracy of battery gauge. Also has settings for 3 cell or 2 cell.
Cut off seems to be set at 3.09 volts on most but that is adjustable also. The software has a mah to wh wizard to assist getting wh correct.
Hope this is of some help.

 

[Phone Guy]

The settings for the battery are suppose to be done by the mod's maker, or do you mean the settings for the 900 mah lipo that Evolv sells?
Battery charge can be set to stop at 4.1 or 4.2, the battery curve only affects accuracy of battery gauge. Also has settings for 3 cell or 2 cell.
Cut off seems to be set at 3.09 volts on most but that is adjustable also. The software has a mah to wh wizard to assist getting wh correct.
Hope this is of some help.

I was wondering about this very thing just today, what is a good cut off value? just leave it at 3.09v?

 

[dwcraig1]

I was wondering about this very thing just today, what is a good cut off value? just leave it at 3.09v?

I have mine set at 3.2 volts, pretty much the higher the easier on the battery if I understand it correctly

 

[smokewell]

3.2 - 4.1 here as well. Anything lower or higher is bad for the Lipo long term.

 

[Phone Guy]

Really? So 3.2v cutoff would give less battery life right? Is the 0.11v significant? Hmm.

The reason I'm asking, I just built one (dna200) with a 1400mah battery. Not sure what I'm getting from it yet, but I'm sure it's at least 1 day (all that really matters in the scheme of things)

 

[smokewell]

Yes but not by much. The proper way to use a lipo is to discharge to 80% of what you charged while staying above LVC. On multicopters we aim for 3.6 but there the drain and voltage sag is massive compared to a box mod.

 

[Mad Scientist]

Really? So 3.2v cutoff would give less battery life right? Is the 0.11v significant? Hmm.

The reason I'm asking, I just built one (dna200) with a 1400mah battery. Not sure what I'm getting from it yet, but I'm sure it's at least 1 day (all that really matters in the scheme of things)

Ideally, charge it whenever you can. The fewer times it gets run down to low cell voltages, the longer the pack will last.

Batteries aren't really my thing but I pick up tidbits in the course of looking at other stuff. Apparently the high discharge rates we routinely use will kill capacity more than any of the other factors that we can control. I guess the takeaway is use a pack of the highest capacity and discharge rate that will fit and be prepared to replace the pack from time to time.

 

[dwcraig1]

My Opus 200 has never seen below 12.1, call it battery charge OCD if you will. I really should set it to only charge to 4.1 per cell.
Some mighty fine info here on prolonging Li battery life:
How to Prolong Lithium-based Batteries - Battery University

 

[KTMRider]

4.2v is fine for lipos. Charging to 4.1v gives you 500 cycles instead of 400 on a typical pack. Sounds like a big difference (25%) but you also get shorter runtimes so you're charging more. Either way, you should get about 1 to 1.5 yrs of daily use out of a battery. For short burst discharges, 3.09v is fine.

That said, I usually charge my DNA200's when I get to 20-40% (a day's worth of vaping).

 

[Mad Scientist]

I finally got my thermocouple interface working. I modified an Ocean Engineering MAX13855E based board by adding a PIC12F675 which reads the MAX13855 and spits out a .csv stream to my PC. The thermocouple is 0.005" type-E wire, with one end welded to form the hot junction. Very low thermal mass, very sensitive (if I move my hand near the junction it will pick up my body warmth). The thermocouple is installed in a Lemo 2 on the coil itself.

Here's the first plot of actual coil temps on a vaping atty -- three vapes on a Lemo 2, mod is DNA 200. Not too temperature stable but the atty isn't great for TC. The troughs in the plot are the "between vapes" time. Just a first run. Many more tests to be done. The columns are event number (just a sequential number for time correlation), coil temp degrees C, room temp degrees C.

 

[Mad Scientist]

Here's the coil with the thermocouple fitted, before assembly into the atty

Here it is assembled, ready to vape

 

[Ryanmcg1]

Here's the coil with the thermocouple fitted, before assembly into the atty

View attachment 489417

Here it is assembled, ready to vape
View attachment 489418

Nice project, thanks for sharing. Do you think with the wire routed out the drip tip your lips can add a variable to your results?
Maybe routing it from the coil through the airflow hole or would the airflow coming across cause more of a false reading?

I have no clue just throwing something out there if you haven't through the about it. Maybe try both ways over a few days and see which one caused a greater impact.
Either way your doing more than I could, keep it up.

 

[Mad Scientist]

Nice project, thanks for sharing. Do you think with the wire routed out the drip tip your lips can add a variable to your results?
Maybe routing it from the coil through the airflow hole or would the airflow coming across cause more of a false reading?

I have no clue just throwing something out there if you haven't through the about it. Maybe try both ways over a few days and see which one caused a greater impact.
Either way your doing more than I could, keep it up.

Out the airflow may be better for practical reasons too (the wire is about as thick as a hair so it takes some patience to put it all together -- the less things the wire can catch on the better). I will definitely try it that way. Thanks.

 

[Ryanmcg1]

Out the airflow may be better for practical reasons too (the wire is about as thick as a hair so it takes some patience to put it all together -- the less things the wire can catch on the better). I will definitely try it that way. Thanks.

No problem. Keep us updated when you are satisfied with your results.

 

[LiveLongAndV'ape]

My Opus 200...

Just loving this mod + Velocity. All I use, battery is lasting me all day. Carefree vaping reminiscent of when I got the Provari and didn't really pay attention to the vaping world for 2 years.

 

[Phone Guy]

question for the drippers out there...do you guys remove the drip tip or the top cap to drip? or just drip into the tip?

 

[dsidab81]

@Phone Guy with wider chuff cap rda's i just drip down the tip. With a normal 510 sized tip, usually it's coming off.

 

[Croak]

question for the drippers out there...do you guys remove the drip tip or the top cap to drip? or just drip into the tip?

A design like the Velocity with no center post, right down the drip tip. I only go topless with center post designs, and I rarely use those types of drippers these days.

Plus, I never use those stupid glass dropper bottles that all the cool kids seem to prefer, if I get juice in those, it gets immediately transferred to a proper narrow tip squeeze bottle.