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Rating: 3 votes, 5.00 average.

Power sources for our radio gear

Posted 02-13-2008 at 04:46 PM by ozace
Updated 02-16-2008 at 01:33 AM by ozace

When i started playing with Vbar i had concerns about being able to feed the electronics with enough voltage and amperage to keep things running so i took what i had laying around and tested their ability.

GP 3700 nimh 4 cell pack.
start voltage = 5.6v
5.5amp @ 5.45v peak
5amps @ 5.4v after 1 min
4.79amp @ 5.27v at 2 min

GP 2000 nimh 4 cell pack 5/4 a size
start voltage = 5.6v
4.65 amp @ 5.10v peak
4.40 amps @ 4.85v after 1 min
4.40 amp @ 4.85v at 2 min


GP 2000 nimh 4 cell pack 5/4 a size second run , 20 min gap
start voltage = 5.4v
4.62 amp @ 4.90v peak
4.20 amps @ 4.80v after 1 min
4.20 amp @ 4.80v at 2 min


GP1100 nimh 4/5a cells 4 cell pack
start voltage = 5.6v
4.57amp @ 4.94v peak
4.3amp @ 4.76v after 1 min
4.28amp @ 4.7v after 2 mins

GP1100 nimh 4/5a cells 4 cell pack (second run 30min wait between tests)
start voltage = 5.29v
4.00amp @ 4.5v peak

lasted 40 seconds before dumping. This pack is 12 months old and not abused but not looked after either.

JR 4 cell 1100mah rx pack (charged at 1amp and tested hot off charger)
start voltage = 5.6v
4.69 amp @ 5v peak
4.25 amp @ 4.7v after 1 min
4.17 amp @ 4.65v after 2 mins

JR 4 cell 1100mah rx pack (25 min wait after first test)
start voltage = 5.27v
4.15 amp @ 4.67v peak
4.00 amp @ 4.5v after 1 min
4.00 amp @ 4.5v after 2 mins

Shortly after the 2min mark the pack dumped. This was a new pack in excellent condition

JR 4 cell 1100mah rx pack (30 min wait after second test)
start voltage = 5.20v
4.10 amp @ 4.50v peak
3.80 amp @ 4.4v after 1 min
3.80 amp @ 4.4v after 2 mins

during the 2nd min the pack could be forced to dump by cycling the load.



Then i decided to try my regs/becs i had laying about.

Hyperion ticool switching bec rated for 4 amps sustained. unit started at 19 deg C
5v setting gives 5.13v actual

4.2 amps @ 4.64v peak reading and it stayed there
at 1 min reading were the same ,temp at 80 Deg C
at 2 min reading were the same ,temp at 100 Deg C


Hyperion ticool switching bec rated for 4 amps sustained. unit started at 20 deg C
6v setting gives 6.11v actual

5.2 amps @ 5.52v peak reading
this time i ran it at a constant 3amp load (temp concerns)
at 1 min reading were 5.76v @ 3 amps ,temp at 60 Deg C
at 2 min reading were the same ,temp at 112 Deg C and melted the shrink wrap



Align 3 amp Reg starting temp 20deg C
Start voltage 5.78v
peak reading 5.15amps @ 5.45v
Test run at 3 amp draw (units recommended ability)
3 amps @ 5.5v , at 1 min 80 deg C
same at 2 mins 106 deg C

Arizona heli reg starting temp 20 deg C
for this one i just ran the "orange" lead with the voltage set to 5.8v, As the rating is so low on the arizona i ran the first test at a 3 amp draw to get a feel for things ( too expensive to destroy).

peak test was 5.4 amps @ 5.6v
3 amps @ 5.71v for 1 min, temp 30 deg C
3amps @ 5.71v for 2 mins, temp 43 deg C

I chose not to test the gyro portion of the arizona as i figure it is only running the one component (gyro and servo) but it would contribute to heat. I figure that the rating of the unit is about right at the 3 amp mark and it looks like it will cope with peaks up to 5amps. I also decided not to run it at a loer voltage as heat would concern me.

Duralite 6v Reg starting temp 20deg C
Start voltage 5.94v
peak reading 5.50amps @ 5.67v
Test run at at max amp draw
5.5 amps @ 5.67v , at 1 min 30 deg C
same at 2 mins 38 deg C


no name 3-5 amp bec starting temp 20deg C (bought from taiwa)
Start voltage 5v setting 5.22v and 6v setting 5.92v
test run using the 6v setting
peak reading 5 amps @ 5.45v
Test run at 3 amp draw (units recommended ability)
3 amps @ 5.6v , at 1 min 65 deg C
test stopped at 1:10 sec as temp spiked and shrink wrap melted followed by vltage drop.

Koolflight Ubec 3 amp 5v bec starting temp 20deg C
Start voltage 4.97v
peak reading 4.32 amps @ 4.8v
Test run at 3 amp draw (units recommended ability)
3 amps @ 4.83 , at 1 min 60 deg C
same at 2 mins 78 deg C


Align 2 in 1 6 amp old style Reg starting temp 20deg C
Start voltage 5.76v
peak reading 5.45amps @ 5.76v
Test run at at peak amp draw
5.4 amps @ 5.75v , at 1 min 76 deg C
test stopped 1:30 heat rise to 100 deg and voltage drop

Kontronic BEC 30
I have one of these and it was the most expensive unit by far. The unit is rated for 3 amps but it cant get near that figure. It caused me a huge amount of grief in my E620 raptor. The unit i have cant cope with anymore than a logo 10 or smaller running analogue servos. It is currently installed in a heli and its too big a job to remove to test like these units suffice to say it would be usless anyway.

I actually tested the unit. At 1.5 amps it died, an absolute waste of time and money. Due to my disgust i destroyed the unit and put it in the bin.


Dualsky 5v-6v Reg VR8L starting temp 20deg C
Start voltage 6.02v
peak reading 5.50amps @ 5.90v
Test run at at max amp draw
5.5 amps @ 5.89v , at 1 min 30 deg C
same at 2 mins 35 deg C



Dualsky 5v-6v Reg VR5L starting temp 25deg C
Start voltage 5.99v
peak reading 6amps @ 5.90v
Test run at at max amp draw
5.4 amps @ 5.85v , at 1 min 60 deg C
same at 2 mins 72 deg C

this is a 5 amp unit , i decided to run it harder to see how it went(good).


Western Robotics Hercules HV 6v Reg 5 amp starting temp 25deg C
Start voltage 5.972v
peak reading 5.38amps @ 5.69v
Test run at at max amp draw
5.28 amps @ 5.69v , at 1 min 50 deg C
5.20 amps @ 5.69v at 2 mins 60 deg C


Sport BEC 5v-6v Reg 6v setting 3.5amp unit starting temp 25deg C
Start voltage 5.9v
peak reading 5.18 amps @ 5.69v
Test run at at 3.5 amp draw
3.5 amps @ 5.76v , at 1 min 40 deg C
same @ 5.74v at 2 mins 65 deg C


Emcotec dpsi rv 5v-6v Reg starting temp 22deg C
Start voltage 5.96v at 6v setting
peak reading 5.44amps @ 5.76v
Test run at at max amp draw
5.42 amps @ 5.76v , at 1 min 36 deg C
5.30 amps @ 5.74v at 2 mins 43 deg C

This is a ripper unit. Priced cheap, comes with a failsafe switch and duel leads.
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