Ws2812 diy led video wall power supply discussion

Other Hardware LEDs and Multiplexing
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Hello,

Power unit calculation/alternative solution to reduce power consumption overall.

Led strip WS2812 (60 pixel count per meter) 8.64W/Mtr

Led video screen snake type data connection.
(As in diagram) Vertical ↑→↓→↑° joint

1 mtr height X 2 mtr width
60 pixel X 120 pixels = 7200 pixels total.

1 strip = 5 Mtrs (60x5=300pixels) (snake type 5 vertical laps)

Will be connecting 3 strips at once (900 pixels)
As controller T8000A doesn't support more than 1024 pixels on one line and has eight lines of data output.

Ie. 1 strip = 5 Mtrs (300 dots)
One set of 3 strips (900 dots)
Eight sets of 3 strips (7200 dots)
My led screen plan (120x60 pixels = 7200)

1 strip (5mtrs) = 300pixels = 18 Amps
1 set of 3 strips (15mtrs) = 54 Amps on 5v

8.64W/Mtr X 120 meters = 1036.8 watts

But few other sources according to Amps suggested 54A roundoff to 60A x8 batch = 480 watts (this is my research of half an hour browsing)

Please look at graph and suggest what should be done in terms of power supply.

Multiple power unit for each of 8 batches
Or single power unit giving power to each batch in parallel connection.

One batch of 3 strips
Eight total batches

24 pcs of WS2812B RGB strip of 60 pixel count 5v to be used .

Thankyou for your time

2

Inject power every 60 LEDs.

For the power supplies, add a little bit of overhead; e.g. 18A → 20A.

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3

How did you come up with that number?

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4

8.64W per meter was told by Meta Ai on WhatsApp

I'm still learning, sorry if I'm wrong..

Power = Volt x Amp (current)

So maybe

7200 x 0.06 = 432 Amps

432 A x 5V = 2160 watts

Now !!? Is it correct

5

Injecting power in parallel is good suggestion..

My two main questions are , to simply

A) How much watt this entire thing will take approx.

B) If 8 (eight batches of 3 strips each) are used simultaneously in parallel connection..

Still entire setup will require power supply for all 24 strips.. or can power required for 3 batches can be multiplied by 8 parallel connection. Ty

6

Each WS2812 can draw about 56mA when all 3 colors are at full brightness.
56mA x 5V = 0.28W/pixel

0.28W x 60 = 16.8W

I suspect that anything you got from AI is wrong.

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7

So,

0.28w x 60 x 120 = 2016w
Safer side 2.5Kw power supply would be sufficient!!?

Also

If 8 batches are used in parallel connection, they would still need 2.5Kw

Or

300Watt or 500Watt supply can be used!? I think maybe not ..

8

Much better to look at the specification for the LED strip you intend to purchase. Otherwise it is all just guesswork.

If you already have a strip, then measure it with a meter.

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9

Think about the current on the AC side. 2500W/120V = 21A.
That would blow all the circuit breakers in my house.

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Do you have a solution.. for total of 24 led strips, watt and amp , led being 5v.

One thing I am willing to do is reduce brightness of all RGB from 255 to 150 so overall power usage is less.. only if total calculation of watts will be too much ..

Any rough figure for 7200 number of dots..

Also any hardware suggestions preferred too..

11

You could use several supplies instead of one, grouping your strips into 'banks', divide things up that way.

I suggest 4 or 5 8x8 modules, more manageable than a bunch of strips, and getting some solid data as opposed to a lot of this anticipatory stuff.

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12

What Arduino did you plan on using for this?

13

and you are sure that will be bright enough?

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Found watt calculation ws2812 official website

No. Of led x 20 ÷ 100
7200 x 20 ÷ 100 = 1440 watt

And amps 432

Maybe this time supply selection is correct.

15

Normal WS2812B LED at max brightness is ~0.3W so for 7200 it would make 2160W.
Which could make you blind.

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Initially I was looking for T8000A ttl (has 8 channel data output) but it has limitations with files upload and live connectivity..

Now I found ESP8266 micro controller
After updating it's code with wifi user pass more options would occur..

Also this one is space saving, only draw back would need to purchase 8 of them for each divided module.. plus 1 to connect with pc/laptop

17

One LED is 20 mA; 20/100 is not 20mA but 200mA so there is a mistake somewhere.

Further a WS2812 in a strip drives 3 LEDs so 3x 20mA = 60mA for maximum white (R, G and B at full power).

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19

Yes , check my post no. 4

20

At the end it's you who decides at what brightness you drive your LEDs.
2.2kW is enough to illuminate a stadium. You might be happy at 20% of that.
And you need lot of computing power as well for 7200 LEDs.

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21

Not to mention, heat a room.

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