SST-90 custom build. questions for the experts

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xP.1337
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SST-90 custom build. questions for the experts

ok, so i am looking at building a SST-90 handheld.  the problem i ran into is the driver.

something with a 9A rating seems to be IMPOSSIBLE to find.  Basically i need a multi-mode regulator. Shoot i may consider it if its only 5 amps lol

 

the housing will be this

http://www.dealextreme.com/details.dx/sku.15946

powered by two 16430 li-ion. 

 

Now i understand the heatsinking issues, lets leave that alone for now.  i have my solutions Wink  the housing will be modified lol

 

and of course this is more of a wow factor flashlight than an acutal left on for hours flashlight lol

 

 

 

soooooo, any regulators? 5 amp max or greater?

Don
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Don't do it!

 

You cannot safely pull the required current even from IMR 16340s. It possibly will work for a while with extremely scrupulous cell balancing. But not a good idea. You are right on the boundaries and any mistake could lead to a nasty explosion - you can make IMR cells explode if you are cruel enough. Check CPF for the TK Monster explosion thread. Those were IMR cells.

 

You are aware that every 16340 cell is grossly overrated for capacity. I'd guess at those discharge rates you would be lucky to get 200mAh out of them. You are talking a 30W device at 9A. At 5A you would probably do better with an SST-50

 

When (if?) flashlightnews.net comes back up there is a lot of detailed design information for the Varapower lights and choices for power control.

 

The numbers from my light tests are always to be found here.

https://spreadsheets.google.com/ccc?key=0ApkFM37n_QnRdDU5MDNzOURjYllmZHI...

SPAMBOT
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Forget about the 16340's, you need a 18650 IMR cell to provide that a high current.

 

DD with a resistored low mode is easy to implement and does not need you to build an AMC sandwich or buy an overly expensive pre-built regulator. There are also some PWM based boards that can tolerate lots of current but they tend to not work so well run on a single lithium cell.

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xP.1337
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well the reason i ask is the sst-90 (on star) is only 50 bux (yea i know, ONLY lmfao) on ebay.

that seems like a decent price, but the sst-50 is 40! thats a rip to me. considering the p7 is only 15 or less

if i do 18650s, i can't see one being able to provide more than 4 or 5 amps. i was hoping to get more. in that case i would need a 2 or 3 sized 18650 and that would be ALOT bigger than i was hoping for.

 

that would be way too expensive of a case, it would be like the ultrafire sst-50 thats like 170 bux, might as well go HID then!!!!

 

(which is another project i have yet to start, have extra HID bulbs and ballasts from cars lol)

 

is it possible that an IMR 18650 can provide the current necessary???

and why dont they make this LED like the MC-E, where i can run it in series for a higher voltage (tricky, but i have seen it done) with less amperage.

 

then i would consider a drive with the 16340s a more viable option.  (8.4Vf at 4 amps vs 3.6Vf at 9 amps.)

i would consider a 3x 16340 at that point.

 

xP.1337
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OH YEA! speaking of IMR 18650 (those are the AW ones im assuming.) i was looking at their newest one on lighthound. 

turns out its a panasonic cell with their protection circuit. if im building a circuit that is designed to cut off at the designated circuit, would i be better saving the 20 buck difference for two batteries without protection from AW?

AW charges 19 bux EACH and from ebay they are (not protected of course) two for 23

http://www.lighthound.com/AW-18650-Protected-2900-mAh-Rechargeable-Lithi...

http://cgi.ebay.com/Panasonic-NCR18650-18650-2900mAh-Li-ion-3-6v-Battery...

 

im replacing my trustfire flames (u know, the version thats NOT overrated lol, yet i have some that cant push over 1.5 amps, cheapo quality) and want something that will put down the power, but some flashlights DONT need it to be protected

and my soshine charger DOES shut off charging when it detects its charged!

SPAMBOT
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AW's IMR18650 cells can deliver 16A continuously so they can power a SST-90 without venting, they can be found here: AW IMR

You can find SST-50's on stars at shiningbeam and KD for around $28, still more expensive than MC-E or P7 though...

If you do a single cell DD IMR18650 light then you don't need protection circuit and will not have any balancing issues etc. Multi IMR16340 is more hazardous and tedious to implement since you need to keep the cells balanced, you also need some kind of discharge protection and a step down regulator.

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agenthex
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if im building a circuit that is designed to cut off at the designated circuit, would i be better saving the 20 buck difference for two batteries without protection from AW?

If you're at the point where you're designing HW beyond just guessing and checking, this level of cost is going to be dwarfed by what your time is worth.

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xP.1337
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to me my time in this is just for fun. so that cost is $0.01 an hour lol

 

 

but thats interesting that an IMR can do 16amps. and that could be direct drive, but that throws modes out the window.....

still a consideration tho.  so you would say that IMR (the one spambot posted) would be a better cell than http://www.lighthound.com/AW-18650-Protected-2900-mAh-Rechargeable-Lithi...

???

 

I would prefer a protection circuit somewhere. so either on the battery, or in a driver. ill pay the money for that battery if im skipping a drive circuit. 

 

 

XRAYBoY
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xP.1337 wrote:
so you would say that IMR (the one spambot posted) would be a better cell than http://www.lighthound.com/AW-18650-Protected-2900-mAh-Rechargeable-Lithi... ???
This battery can power a SST-50 (Max. Discharge 5.8A), but not enough to power alone a SST-90...and IMR can do it.

The IMR also has a more safe chemical  to play with it (Even if it sacrifices the runtime).

This may give you some idea for the driver: http://www.candlepowerforums.com/vb/showthread.php?t=276105

ForoLinternas.com

agenthex
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to me my time in this is just for fun. so that cost is $0.01 an hour lol

Yes, I realize the fun aspect. My opinion is that it's "fun" to play around with them, put them up against light meter, little tweaks, etc. I'm a major cheap-ass and don't want to spend good money on fun. I'd probably roll a wheel with a stick before I spend $100 on bar tabs.

 

But once you start circuit design, like serious bidness with equations and stuff, it's more akin to work. Then spending $ on parts is not a big deal.

 

Maybe silly, but makes sense to me.

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xP.1337
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WOW! 35 euro? thats like 70 USD!!!!

 

and then another 6 euro for shipping.... but looking at that, i may be able to copy that circuit lol. not much to it!

ill consult my friend (EE) on this one lol

 

 

as far as circuit design, the equations come easy for the most part.  but hey, to each their own, right?

xP.1337
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SPAMBOT wrote:

AW's IMR18650 cells can deliver 16A continuously so they can power a SST-90 without venting, they can be found here: AW IMR

You can find SST-50's on stars at shiningbeam and KD for around $28, still more expensive than MC-E or P7 though...

If you do a single cell DD IMR18650 light then you don't need protection circuit and will not have any balancing issues etc. Multi IMR16340 is more hazardous and tedious to implement since you need to keep the cells balanced, you also need some kind of discharge protection and a step down regulator.

 

are those the only 10C batteries they carry?

i dont need 10C, (10C means it can discharge up to 16000ma right? way over kill lol)

if theres something with a better capacity, and is closer to the discharge rating, that should work for me lol

 

im considering a 3x18650 set up btw.  I may go super custom, or do a mag conversion with those big D sized li-ions lol

agenthex
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http://www.bmsbattery.com/index.php?main_page=index&cPath=1_10_11&zenid=...

 

Exactly 2xD size....and also 4d maglites

 

Maglite pills for $20...

 

Can that sst-50 driver on kai be used in parallel?

 

..........

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agenthex
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Nevermind, that sst-50 driver as noted in the comments seems to be a fake; just a MC-E driver with name changed...

 

http://www.kaidomain.com/ProductDetails.aspx?ProductId=10653

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