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Reducing Power Supply voltage

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Working on a 24 string 48 node matrix.  Using a pixie16 and Pixie 8.  Power supply question...  Using 12 volt strings.  I can set up the software to be at 50% which will use half the amps/watts.  So can I set the software at 100% and turn the voltage down to 6 volts and have the same result.  This may be a dumb question......  trying to figure out what power supplies to buy.

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2 hours ago, NTJP said:

Working on a 24 string 48 node matrix.  Using a pixie16 and Pixie 8.  Power supply question...  Using 12 volt strings.  I can set up the software to be at 50% which will use half the amps/watts.  So can I set the software at 100% and turn the voltage down to 6 volts and have the same result.  This may be a dumb question......  trying to figure out what power supplies to buy.

NO! Don't do it. The controller need 9-12V to run

You reduce the AVERAGE power by setting to 50%.   The AMPs are still there, just for short bursts.

Matter of fact, I set my voltage UP to 12.7VDC ( safe, even with no load) to compensate for voltage drop in the strings.

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15 hours ago, NTJP said:

Working on a 24 string 48 node matrix.  Using a pixie16 and Pixie 8.  Power supply question...  Using 12 volt strings.  I can set up the software to be at 50% which will use half the amps/watts.  So can I set the software at 100% and turn the voltage down to 6 volts and have the same result.  This may be a dumb question......  trying to figure out what power supplies to buy.

For a matrix you can get by with 2 - 350W PSU's. 

Let me find my build thread or my picture and link it.

I have the dual pixies dual psu's on my first matrix. The problem you may face is finding an enclosure large enough to fit everything. I found mine on ebay and it has a lot of room. 

JR

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1 hour ago, dibblejr said:

For a matrix you can get by with 2 - 350W PSU's. 

Let me find my build thread or my picture and link it.

I have the dual pixies dual psu's on my first matrix. The problem you may face is finding an enclosure large enough to fit everything. I found mine on ebay and it has a lot of room. 

JR

I use dual HC 400W (33A) External hanging off the back of a CG-1500, powering 2 @ CMB24 (similar size).  The extra power leaves 26.4A at 100% duty cycle 😮

My CG-1500 are closet pole mounted, so 1 PSU goes on either side (cord UP). I use 1" angles for the Top PSU mount. Angle rests-bolts  on top of CG-1500

Leaving tons of cool room inside. (you could even mount a standard 350W on the door if 1 bank needed more power) IIRC HC sells door mount plates for the 1500)

FWIW some of these are on their 2nd rainy season without issue

 

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12 minutes ago, TheDucks said:

I use dual HC 400W (33A) External hanging off the back of a CG-1500, powering 2 @ CMB24 (similar size).  The extra power leaves 26.4A at 100% duty cycle 😮

My CG-1500 are closet pole mounted, so 1 PSU goes on either side (cord UP). I use 1" angles for the Top PSU mount. Angle rests-bolts  on top of CG-1500

Leaving tons of cool room inside. (you could even mount a standard 350W on the door if 1 bank needed more power) IIRC HC sells door mount plates for the 1500)

FWIW some of these are on their 2nd rainy season without issue

 

Yes you can do it with external wp psu’s However

I prefer not to have anything external to my controllers with the exception of the cables.

My second dual pixie Controller uses 1 750w psu. It’s a huge psu.

The one mentioned above with 2-350’s hasn’t had any problems controlling the matrix and like you we have had horrible rain for the past 2 years esp 2018. Record breaking.

JR

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1 hour ago, dibblejr said:

Yes you can do it with external wp psu’s However

I prefer not to have anything external to my controllers with the exception of the cables.

My second dual pixie Controller uses 1 750w psu. It’s a huge psu.

The one mentioned above with 2-350’s hasn’t had any problems controlling the matrix and like you we have had horrible rain for the past 2 years esp 2018. Record breaking.

JR

I worry more about heat. We had very few evenings in the low 30's,some barely got out of the 50's. My area only got slightly above normal rain, unlike the poor folk in the north bay area.

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51 minutes ago, TheDucks said:

I worry more about heat. We had very few evenings in the low 30's,some barely got out of the 50's. My area only got slightly above normal rain, unlike the poor folk in the north bay area.

Never a problem about heat esp with the pixel controllers. We are also in a pretty warm climate esp with the Halloween setup.

K6CCC and Mr. P and several of us had this discussion a couple years ago. I think Jim has the temps from his attic. I have 4 in my attic as well. I do have two vents in the largest enclosure but no fan. Someone had told me "I needed to get a fan" or they would fail. At that time Jim explained his thoughts of the heat on a non AC controller. I was also told to sit in a closet with a heater in it and see if I over heat. There is a big difference between an electrical component and a human being. Unless the military reprogrammed me or place my skin over a robotic shell, but I still bleed. LOL

I think Jim is in your area. For some reason I was thinking you was in FL until just looking at your info.

JR

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For 2018, my pixel tree had a 12 x 12 x 6 PVC electrical box with four 350 watt power supplies (3 x 12V and 1 x 5V).  I had a temperature monitor probe in the box and heat was a problem - not from the power supplies, but rather from the sun.  I had painted the box flat black so it would not show as much at night, but in the sun, it got quite warm.  Had to add some ventilation for the box.  The power supply is the square box on the right side of eh tree about 2/3 of the way up.

Front_of_House_2018-12-03.jpg

 

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