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Old Apr 14, 2015, 05:21 AM
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I meant to do that
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I'm assuming your response accepts that wires 1-5 were the correct wires. If so then I'm satisfied I have the fan rigged correctly for slow start up. The noise isn't bad, just louder than expected at slow start up is all.

Amps will vary anywhere from just a few amps up to about 30 amps when it will be shared with a buddy at the field with his new generator. Which means both home use and at the field.
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Old Apr 15, 2015, 11:22 AM
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Running 4 in series

If I am running 4 of these in series, do I need to isolate the grounds of supplies 2-4? Or just supply 2? Planning on using 48v to power my charger 4010 Duo.
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Old Apr 15, 2015, 12:20 PM
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This is BAT country!
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I think you need to float the ground on 3 of the 4. You want only 1 grounded to prevent shock if something fails.
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Old Apr 15, 2015, 03:07 PM
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Use the 4S Luke
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You need to sloat the output ground on 2-4. Do it only on the output. See my blog.
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Old Apr 15, 2015, 10:45 PM
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fan speed

Hi I am just now building my 24v PS , question by hooking up # 4 and 8 pins do I just have high and low speed or a varible speed with increasing load which is what I want. also why are some of you installing a pot or resister ? to increase voltage to 13.8 , does it really make that much difference . thanks wfojerry
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Old Apr 16, 2015, 01:04 AM
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Use the 4S Luke
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I have 24V chargers and have never adjusted the output voltage of a power supply. I leave the 47A power supply fans on 'hi' because when I charge I normally use the full output and also because in the summer here in Texas, it gets >100degF. I have never burned up a power supply.
If you want/need a quieter power supply the DPS 1200 is 75A output and a temperature controlled fan that never seems to run very fast. Check my blog and website.
Here is another thread:
http://www.rcgroups.com/forums/showthread.php?t=1965624
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Old Apr 16, 2015, 11:32 AM
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Very good thanks you are so right , yes we are not up north it's hotter than /&&" here and need all the cooling we can get
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Old Apr 16, 2015, 03:45 PM
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Oh yeah now I see where you are.
I always say that if someone is flying a glow/gas heli, I can't hear the fans anyway.
I do not charge at home.
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Old Apr 17, 2015, 09:58 PM
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Working on my power setup for my new icharger 4010 which should be here any day. I isolated the grounds in three of the 4 supplies. Added an extra 12v tap for fans.

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Old Apr 17, 2015, 11:17 PM
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That charger is capable of 1400W or 2000W depending on what you are charging. So accounting for 10% loss in the charger and 10% in the power supply, that's 1680W input. At 120V that is 14A. A standard house circuit is typically 15A. It may work if there is no other load on that circuit and if the panel is not hot.
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Old Apr 17, 2015, 11:45 PM
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My workshop is wired with all dedicated 20A quads. I believe my flying field also has all dedicated 20A circuits.
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Old Apr 18, 2015, 10:57 AM
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That is a great setup.
We have 20A circuits at the field but during a fly-in we can have trouble overloading them as you can imagine.
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Old Yesterday, 02:21 PM
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I meant to do that
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This is trivial but I can't seem to find the answer or decipher by feel.

Do the fans push air into the PS or draw air out? Reason I ask is I want to make sure to place the booster fans I am installing in my carry case on the right end of the PS so it won't fight the air flow of the PS fan....

Thanks!
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Old Yesterday, 03:50 PM
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Quote:
Originally Posted by eMoon View Post
Do the fans push air into the PS or draw air out?
Both.

The DC output side where the fans are located is the air inlet and the AC input side where the power cord connects is the air exhaust.
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Old Yesterday, 08:44 PM
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I meant to do that
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Ha! As you could tell I couldn't figure an easy/clear way to ask as concise as your answer. Thanks!

Quote:
Originally Posted by mrforsyth View Post
Both.

The DC output side where the fans are located is the air inlet and the AC input side where the power cord connects is the air exhaust.
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