Brew12
Electrical Gru
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My Tank Thread
Agree with almost all of this. This is the type of research I wish more people would do!Brew12,
Although the Vectra may be the same motor as the link you provided, I believe it has some dissimilarities.
The power supply which is a primary failure of DC pumps. I am not for certain but I believe the Vectra uses a higher quality power supply. Also a feature often overlooked is the low voltage supplied. eg Jebao 24v , Vectra 36V. I always prefer the higher voltage simply for the fact of lower current draw. Lower current draw tends to heat up less than a 24v hence slightly better reliability. Now, if you are using a high quality 24v then it's a different story, that being said I highly doubt Jebao is using high quality components.
Second on the list of failure would be the controller, hands down Vectra has this feature over Jebao.
Yes you are correct in that it may have far more features than one may need, but the quality is better.
Third comes the pump. Usually pumps on their own are not a concern, except for things such as tolerances between the shaft and bearing as well as rotor to stator. This comes to play when calcification becomes a concern. Take an Eheim motor for an example , I 've gone a year without cleaning, once taken out it did not have a spec of calcium deposit. I can't say that about these new DC pumps yet. This could be part of the motor failures, for which are misdiagnosed for a motor failure.eg(open winding)
Also another spec I would like to mention that nobody talks about and as far as I am concerned is most important, the performance of the pump.
This is where I believe the Vectra stands out. Look at their flow rates vs others of the same pump and you can clearly see others a far more exaggerated.
Without mentioning names , I have seen a test clearly documented on a DC pump which claims a flow rate of 6000l/h and true flow rate was 4000l/h roughly 33% at 55 W. This is insane. As you can see given this spec there are several AC pumps that can come very close or even exceed those numbers.
A quality pump with comparable, if not better flow to some of these DC pumps are the Fluval Sp motors.Not only do they perform well the are just as quiet as some of these DC if not quieter. So all this fuss over DC pumps I truly don't understand, unless you need variable flow.
I can tell you there will be an AC motor coming after the New Year that will be extremely efficient;) and very quiet.
JMO
Just a few thoughts
I think most motor failures are because of water leaking into the housing or mechanical binding (mostly due to poor maintenance)
The difference in current between 24V and 36V is about 1.1A @ 80W so it isn't too significant in smaller motors like this.
I would also point out that the Vectra pumps have also had flow complaints.
Completely agree that Vectra's have better controllers and that is what you are paying for with Ecotech. Power supplies are probably almost exactly the same between manufacturers.
