FainWanRC Products 3amp - 6.0-25.2v Input / 5v/6v Adjustable Output BEC

Does what it says. Switchable option makes it great

I didn't need the light wait aspect. Just reliability and the ability to filter motor noise out of the 5v supply. It is rated for 3amp, but because of the packaging I cannot just stick a Heat sink on it. It works fine without it, but I probably could get more life out of it if I could. All-in-all it works perfect for my application.

works exactly as it should. what more is there to say? buy it.

I bench-tested this – as I always do, after a few bad experiences over the years – and while the voltage is not very accurate, this controller works as it is supposed to. The toroidal core is meant to flatten the output, and I guess it does to some extent. My main concern was about large swings in voltage on the output, and this controller seems to behave well in that respect.

UPDATE: I returned this unit for a replacement. Sadly, the replacement was also inaccurate. The 5 volt pin produced 5.23 volts. The 6 volt pin produced 5.94 volts. So this will work for RC purposes but if you want a very accurate BEC, this is not the unit for you.This works as expected mostly, however the 5 volt pin setting actually produces 5.29 volts. The 6 volt pin setting does produce exactly 6.01 volts. A little disappointing but not enough to return it. I purchased this unit over the others at the same price because of the included green toroidal core. They are supposed to reduce the ripple in the DC output. All these types of units are digital switching regulators and all have ripple (noise) in the DC output.

FAINWAN’s offering of the Hobbywing 3A UBEC (Universal Battery Eliminator Circuit) is a good way to supply 5V to a small robot or RC project from a LiPo battery. It is a popular UBEC and a very easy module to use. The only option is a jumper that allows you to set no load output voltage to either 5 or 6 volts. It is a module that is available from several sources. The UBEC has over-temperature protection.I tested the module using a constant current load and a bench power supply. Simulating near discharged 2S and 3S LiPo batteries, with 7.5V and 11.25V.I was not able to complete a 10-minute test at 3A without the over-temperature protection kicking in. The highest current I could successfully run for 10 minutes was 2.5A. As expected, the module became very hot with each test. However, the UBEC continued to work without issues.The module is capable of supplying 3A but can only run 2.5A continuously.At no load the 5V jumper setting resulted in 5.3V and the 6V jumper setting resulted in 6V. The internal resistance of the UBEC was such that at 3A and the jumper on 5V, output voltage was right at 4V. When the jumper was moved to 6V, the output voltage was at 4V for the 7.5V case, and 5V for the 11.25V case.I have used this module in multiple robot projects but have never really used it at maximum current limits. My experience is that the Hobbywing UBEC is very reliable. I will continue to use it in my projects, but now I have a better understanding of its limits.

I was skeptical about the quality of this UBEC and unfortunately I was correct. This is a tiny device that I really doubted could provide 5V at 3A. I did not even get close to 3A, I ran it with a 7.2 lipo at 5V 1A and it got extremely hot. It did not shut off due to its overheat protection which made me think that high temp would be normal. However there is no way I would install something that gets this hot inside my helicopter. Anyway, at the end, the voltage it was delivering was higher every time, with no difference between the jumper positions, it ended up delivering over 6V on the 5V position.I returned it and will look for something more adequate and of reasonable size. I know that small devices nowadays do great things, but devices this small usually don't handle high currents. This might have been a defective unit but I don't want to take the risk.

I put this under a synthetic load of 2A -less than rated current- and it started squealing and making audible noise. Any more current and it went into shutdown mode.This may work for low current applications. But there's no way it can handle heavy duty servos.There is the possibility that I got a faulty device...