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Electric Battery-Charger-pSupply
› Looking for a 1200W PS
05-30-2012 07:55 AM  6 years agoPost 1
rcflyerheli

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Granbury, TX USA

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I am looking at upgrading my noisy and I'm not convinced totally safe HP banded 24v 47amp cobbed together with one of two new 1200W power supplies.

The two that I am looking at are the Chargery 1200 and the E-Fuel 1200. It appears that both are produced overseas, but are distributed by reputable suppliers (Readi Heli and Empire RC).

What is anyone's opinion of these two power supplies. Right now I am leaning to the Chargery brand, as it appears that there is no "main" plug, but rather three outputs that can total the output of the unit. Whereas the E-Fuel unit also has 3 (maybe 4) outputs, but it is arranged with a main output that can carry the full output by itself, but the other outputs have a limit of 10a each, and when used in conjunction with the main can total up to the rated output of the charger. This seems to stop the use of 3 chargers pulling 20a each.

I have to admit the HP power supply is being used by a lot of people, but a lot of comments on possible failures and the danger associated with short circuit failures has me spooked. I am good in structures, aerodynamics, and mechanical systems, but not at all knowledgeable in electrical stuff.

I appreciate any help in this area.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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05-30-2012 02:22 PM  6 years agoPost 2
TheWoodCrafter

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Costa Mesa, Ca.

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What you now have, a PS designed to run expensive, highly critical computer servers, is perhaps the best made PS you can buy.
It is internally protected from over amping, under voltage, over heating and short circuiting.

Just because you don't feel comfortable and have experience with electricity doesn't mean it is unsafe.

You will hear lots of opinions about how safe they are.
Ever hear about one actually shorting out and hurting someone?

Thanks, TheWoodCrafter

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05-30-2012 10:37 PM  6 years agoPost 3
Gregor99

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Western Wa

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I have to admit the HP power supply is being used by a lot of people, but a lot of comments on possible failures and the danger associated with short circuit failures has me spooked.
Most, if not all of these comments are regarding the method used to remove the ground from the second supply. If the ground was removed from the AC side, then yes, you have reason to be concerned. If the ground was removed from the DC side, then the safety issues no longer apply.

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05-31-2012 04:11 AM  6 years agoPost 4
rcflyerheli

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Granbury, TX USA

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Like I indicated in the original post, I don't know enough about these things to fully assure myself that the correct ground was removed.

Besides, this thing is really noisy, and nothing I do can quieten it down. I have read about putting a resistor on some pins, but that is beyond my desire and ability to do so, so that is why I am looking at the two 1200W power supplies I named in my original post.

I am just wanting information on either of the two named ones if anyone else is using one.

Thanks.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-31-2012 04:25 AM  6 years agoPost 5
Ace Dude

rrProfessor

USA

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I'm using a Meanwell 24v industrial power supply. It works great, did not require any mods, and it is single unit as opposed to two 12v units. The voltage is easily adjustable up to about 26-27v as well.

  

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05-31-2012 06:52 AM  6 years agoPost 6
Gregor99

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Western Wa

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that is beyond my desire and ability to do so, so that is why I am looking at the two 1200W power supplies
That being the case, Chargery is likely the better choice as it has active power factor correction and the efuel does not. Either one will not likely have the same quality of power you will get from server supply. Probably good enough for hobby use.

Here's the Junsi version of the Chargery.

http://www.progressiverc.com/junsi-...wer-supply.html

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05-31-2012 12:54 PM  6 years agoPost 7
4cyclic

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Montreal, Can. and northern Vermont

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I would run 2x Iota 55a 12v ps in series to 27v, or the Meanwell 1500-24 to 26v.

I felt the same about removing the ac ground.

Here is what I use:

Meanwell 1000-24 at 26v
Iota dls-55 in series to 27v
Iota dls-90 in series to 27v

Iotas dls are designed to run in series if you want to.

Life is meaningful flying helis.

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05-31-2012 02:50 PM  6 years agoPost 8
rexxigpilot

rrProfessor

Florida

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If noise is an issue for you - it is for me - then the Iota is your answer. It has a variable speed fan that makes it very quiet compared to other power supplies. I recommend the DLS-27-40. It has 1100W output, 40A and 27.8V. See manual below.

I have a 1500W Power One PS too, but it does not have a variable speed fan. I find that I will use my Iota over the Power One due to the noise issue.

The Meanwell is very loud even compared to the Power One. MW use small diameter fans at high speed, which is very noisy. The PO has a large fan so it is not too bad as far as noise goes but still louder than I like.

One thing to know, the PO sand MW are PFC, which allows them work at higher output on weak generators. They are about 90% total efficiency, so a 1700W generator will get you all 1500W of output. The Iota is not PFC, so it needs a more powerful generator. It takes a 2000W generator to get you all 1100W from the Iota. Of course if you charge at home or with utility power it doesn't matter.

https://rc.runryder.com/gallery/62958/27vdlsmanl.pdf

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05-31-2012 03:40 PM  6 years agoPost 9
4cyclic

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Montreal, Can. and northern Vermont

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Good points rexx.

Life is meaningful flying helis.

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06-01-2012 04:28 AM  6 years agoPost 10
pctomlin

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Texas

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If you are doubtfull about removing DC grounds get a pair of Dell 6650s. They require no modification to run in series because the AC and DC grounds are already isolated from each other. These are 12V 900 watt PSUs so a pair of them are 24V/1800 watts in series. The fans are pretty quiet too and under speed control by the PSU again with no mods needed. The biggest drawback to these is they are larger than other PSUs and require a C19 power cord instead of a standard PC power cord.

Here is a link to the latest build pictures I did on another site.
http://www.helifreak.com/album.php?albumid=9094

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06-01-2012 12:13 PM  6 years agoPost 11
4cyclic

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Montreal, Can. and northern Vermont

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No, 2x 12v 900w ps will become 24v 900w unit, not 1800w.

Life is meaningful flying helis.

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06-01-2012 02:12 PM  6 years agoPost 12
TheWoodCrafter

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Costa Mesa, Ca.

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No, You are wrong 4cyclic, it will be 1800watts.
The voltage is double and watts is power, not amps.
V X A = W
AMP will not double.

Thanks, TheWoodCrafter

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06-01-2012 04:11 PM  6 years agoPost 13
rexxigpilot

rrProfessor

Florida

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In series connection the voltages are added. In a parallel connection the amperage is doubled. 2 - 12V, 900W power supplies in series will become 24V, 1800W.

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06-01-2012 04:34 PM  6 years agoPost 14
G-Limo

rrApprentice

Europe

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Check out this thread..

https://rc.runryder.com/t690972p1/

I have 2 running 24 volt and works a treat... Save you all the donkey work.

/Limo

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06-01-2012 04:59 PM  6 years agoPost 15
VKGT

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Sanford, NC

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I'm running two of the Dell 6650s and they have been GREAT. Lots of build threads on the charge boxes so take a look

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06-01-2012 09:18 PM  6 years agoPost 16
pctomlin

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Texas

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In series connection the voltages are added. In a parallel connection the amperage is doubled
In series it is 24V/1800 watts.
By your quote:
900W/12V equal the rated output amps of one of these PSU. In series you now have a PSU that is 24V with a 72 amp capability.
1800/24V equals 72 amps. In your argument you are saying that two of these PSUs in series are 24V and 36 amps, not correct. In series the volts and watts double, the output amperage remains the same. In parallel the volts remain the same, amperage doubles.

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06-01-2012 09:18 PM  6 years agoPost 17
TheWoodCrafter

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Costa Mesa, Ca.

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In series connection the voltages are added. In a parallel connection the amperage is doubled. 2 - 12V, 900W power supplies in series will become 24V, 900W, not 24V, 1800W.
Man I don't know what you are smokin but when 2 are wired in series the WATTS will add just like the volts will.
A 900 watt 12V PS is about 75AMPS.
Again the formula is -
One PS
V X A = W
12V x 75A = 900Watts
Two PS
24V x 75A = 1800Watts

So when 2 are wired in series you get a 24V 1800WATT PS that is 75AMPS.

Any other answer is wrong.

Thanks, TheWoodCrafter

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06-01-2012 11:32 PM  6 years agoPost 18
Ace Dude

rrProfessor

USA

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So when 2 are wired in series you get a 24V 1800WATT PS that is 75AMPS.
From a practical standpoint, the output is dependent on the input power to the power supply. You're not going to get 1800W out from a single standard 15A/120V household receptacle in the USA.

  

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06-01-2012 11:33 PM  6 years agoPost 19
Gregor99

rrElite Veteran

Western Wa

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V X A = W
12V x 75A = 900Watts
Two PS
24V x 75A = 1800Watts
Looks right to me. If wasn't correct, them someone is going to have to explain how I was able to get 1000 watts of power my packs using two 12v 575 watt supplies in series.

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06-01-2012 11:41 PM  6 years agoPost 20
Gregor99

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Western Wa

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You're not going to get 1800W out from a single standard 15A/120V household receptacle in the USA.
Many modern households have 20 amp breakers, or 2200 to 2400 watts depending on the voltage. Some have a mix of 15a and 20a. You just have to check the breaker box when planning out your bench charging setup.

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