i am searching for a driver which can deliver up to 5amps at 56V.
Nowadays there a many crazy powerful flashlights available.
Recently i found the GT4 with 25000L using the Texas avenger driver.
I have a lot of Samsung INR 18650-30Q batteries which i would like to use.
I could build a 8- or 10S-pack from them wich would deliver app. half of the voltage needed for the LED.
Does anybody know if this is possible with one of the drivers or is the needed voltage just to high?
THX a lot,
Try the TaskLED Ultraboost. It’s rated for absolute max 80 volts output at 4 amps. You probably won’t get any higher than that out of a commercially available flashlight sized driver though. The Ultraboost doesn’t have a UI (uses a pot). You could make one yourself, but it would take the skills and know-how.
I would like to address something that has not (yet) been mentioned: drawing this much energy from an 8S or 10S pack of Samsung INR18650-30Q cell’s. I would advise against it because these are unprotected cell’s.
I have a BLF GT and a Q8, and I use 30Q cell’s with buttontops in them. But these all are married cell’s. I’ve bought them together. I use them together and they are charged together. Thus ensuring as much as possible that all cell’s are identical in wear and tear. This is a P2-4S resp 4S configuration.
If the cell’s you own all have a different past, you might be on the road to disaster. What if 1 cell is depleted completely and the other 7+ cell’s are putting their backs into it? You might get a reversed polarity in the weakest cell. Who knows what happens then.
yes, Sirstinky, few minutes after asking here i found that video from Matt from ASF, where he puts a Cree CXB into a BLF GT housing using the ultraboost.
I don’t need an ui, the poti is totally fine for me! I think i will go with this, thanks!
Robin, i already tested and destroyed a 400W and a 600W DC-DC converter with this COB and another COB I have. I think this happened because i did not use batteries as the
power source but a laboratory power adapter. I know now they don’t like each other
But anyway, these DC-DC converters are a bit bulky and not really sturdy. This is why i don’t like them to much. But with batteries they will work.
BTW, i need a floodlight, no throwing capabilities necessary.
Henk, thanks for your comments also. Of course i will go with a BMS circuit board (at the moment i think 10S2P), no worries…
I also have a BLF GT70 with these cells, also all bought togehter…
If there is any progress once, i will post it here. Will have more questions soon…
best regards…
Glad to help. Matt used the hyperboost, which has been discontinued in favor of the Ultraboost. The Hyperboost is special-order only. You’ll need at least 10S for efficient operation at 56 volts output. You’ll still be limited to around 250-300W as 4A is the ceiling for that driver. Those DC to DC converters are pretty useless if you push them hard. Don’t believe the factory rating because reasonably they’re only good for 1/2 to 1/3 that output. I have a 100W COB light that’s gone through 2 of those 250W DC to DC converters and ai only run it at 110W.
