9A+ battery combinations

[greencardigan]

Hi,

Which of the following battery combinations will be typically be able to supply 9A+ direct drive current to a LED (SST-90)? Assume the Lion cells are DX or KD batteries.

1. 12 AA Eneloop NiMH in a 4S3P config
2. 12 AA Eneloop NiMH in a 3S4P config
3. 3 x C NiMH in 3S config
4. 2 x 18650 in 2P config
5. 2 x 26500 in 2P config
6. 3 x 26500 in 3P config
7. 2 x 26650 in 2P config
8. 2 x 32600 in 2P config
9. 2 x 32650 in 2P config

Thanks.

 

[VidPro]

somebody check my work

1. 12 AA Eneloop NiMH in a 4S3P config no
2. 12 AA Eneloop NiMH in a 3S4P config yes
3. 3 x C NiMH in 3S config mabey
4. 2 x 18650 in 2P config could but i wouldnt
5. 2 x 26500 in 2P config getting there
6. 3 x 26500 in 3P config now you got it
7. 2 x 26650 in 2P config getting there
8. 2 x 32600 in 2P config should do it
9. 2 x 32650 in 2P config same , should pull it off

that covers the AMPS, not the voltages, but mabey not the heat of the cells pushing that for long times.
so are you going to try and DD this? is that some of your questions?

http://www.luminus.com/stuff/conten...2_sst_90_w_product_datasheet_illumination.pdf
probably runs a "lower" Vf, because instead of singular excessive high drive, you have many many emitter thingies (even though your running it at excess heat wise). so i would think real battery voltages of 3.6-3.8 would proably be enough WITH wiring switches and all added in, vrses wanting to cram it up to 4V.
see what i am saying, this isnt going to be a single emitter thing that can handle high voltages like a K2 style of thinking. This is more of a multiemitter lower max voltages but many many in parellel and way close to eachother for heat issues. So once you get some high AMPS going, like a hotwire , you will be way more restrictive on your voltages than some other Drives.

why not 3xD ni-mhy ? say some Good ones? like the latest LSD cells at 10A, they will heat up a bit, but container size would be more normal.
tested the D accuevo thing, holds a 1.3V at 9A, slowly going down down down.
heck it was practically a dead short across the meter, i added just a bit of wire for resistance, so i was thinking probably more voltage IS better. it starts getting warm fast, i would probably toss 3 of them in, wire it with copper everywhere , modify any switches to low low ohms, and DD away. run at ~8amps dwidling down to ~4 half way through, might work??


You gonna have a tough time Charging Parelel(series) Ni-mhy , would require exacting alogrythm or seperation and seperate charging.

 

[greencardigan]

Thanks for your thoughts.

No, I probably won't direct drive. I'm hoping to use a linear regulator and pwm dimming. But will still need the 9A+ with voltage close to the LED Vf.

 

[VidPro]

what regulator would do 9 amps without loseing at least .5v?

 

[Popsiclestix]

somebody check my work

1. 12 AA Eneloop NiMH in a 4S3P config no
2. 12 AA Eneloop NiMH in a 3S4P config yes
3. 3 x C NiMH in 3S config mabey
4. 2 x 18650 in 2P config could but i wouldnt
5. 2 x 26500 in 2P config getting there
6. 3 x 26500 in 3P config now you got it
7. 2 x 26650 in 2P config getting there
8. 2 x 32600 in 2P config should do it
9. 2 x 32650 in 2P config same , should pull it off

Why is 1 and 2 no? 15x Eneloop can pull 8A+ on my 64458, I think it's oft-quoted around here that you can safely pull 6-7A off an Eneloop. In 3P, you could pull almost 18A-21A off them.

3. Cheap NiMH can not pull off 9A discharge. But certain cells can. Note that I'm not endorsing this particular cell, but do check data sheets before you buy.

4. AW's IMR18650 is rated to 16A single-cell discharge. Can pull 32A if you want off 2 of those cells in parallel.

5-9. All definitely doable.

 

[mdocod]

4x18650P in "big-body" customs is popular.

 

[Fallingwater]

I'm hoping to use a linear regulator and pwm dimming. But will still need the 9A+ with voltage close to the LED Vf.

What regulator are you planning to use? Your specs come close to the AMC7135 drivers, but I've calculated you need 26 of them to drive a 9A LED. I'm assuming you're not mounting seven 4-chip driver boards into one huge pancake.

I'm asking because I'm looking for a high-power buck driver as well.

 

[greencardigan]

Yes, I intend to use 6 parallel 4 x AMC7135 boards.

However, I may replace them with a buck driver when I find one I like. Then I can run my 26500 cells in series rather than parallel.

If only someone made a nice parallel holder for 3 x 26500 cells.