Like the title says according to what I've read about this device it's a 10 amp max output but it's also only vw so it can go down to a .3 ohm coil and only push 10 amps at 30 watts so why does everyone suggest a 30amp battery?
Why does the dna30 want a 30amp battery
- Thread starter Joe Riccardi
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the dna 30 is like a pump, it increases the "pressure". It needs a good source of "fluid" to supply the demand...
lame... I know but I havent had enuf coffie yet...
lame... I know but I havent had enuf coffie yet...
If your using pumps in a boiler system as a metaphor they don't increase pressure they just move the water but anyway I get what your saying I basically wanted to know if my orbtronic 2900mah 10amp constant drain batteries would be OK to run a dna30 at 30 watts
Cannot look at the output current and apply that to the battery. You have to look at the output power and then figure battery current with the battery's fixed voltage. (Like many aspects of physics, only power is transferred.)
So a 30 Watt output from a battery approaching the limit of it's charge would have 3.2 Volts. Since P=VI and I=P/V, it seems that 10 Amps is enough, but the DNA has, at best, 93% efficiency so when that is factored in, we are above 10 Amps. If we put a reasonable safety factor of 1.2 in to account for manufacturing variances and to prolong battery life expectancy the figure is just a shade higher than 12 Amps.
So any battery capable of outputting over 12 Amps is going to work well and have a good long life. Anything less and it will likely be disappointing.
So a 30 Watt output from a battery approaching the limit of it's charge would have 3.2 Volts. Since P=VI and I=P/V, it seems that 10 Amps is enough, but the DNA has, at best, 93% efficiency so when that is factored in, we are above 10 Amps. If we put a reasonable safety factor of 1.2 in to account for manufacturing variances and to prolong battery life expectancy the figure is just a shade higher than 12 Amps.
So any battery capable of outputting over 12 Amps is going to work well and have a good long life. Anything less and it will likely be disappointing.
the important part of the equasion is having a safety zone as to what is pulled and what is supplied... if the dna can pull 10A then its best to have 15+ available. pushing a battery to its upper end limits can reduce battery life overall ( get 2 months instead of 9 months usage) and if you use the wrong type of battery and push beyond its safe zone, things can get nasty....
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