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AusChristmasLighting 101 Manual
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101 display basics
Why all the ports on a controller…
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[QUOTE="TerryK, post: 130673, member: 32169"] I use this: [# pixels] * [type of pixel amp @ 100% white] * [drive level as decimal] So for your 750 pixels if you are using 5 Volt WS2811 pixels: At 100% White: 750 * .055 * 1.00 = 41.25 Amp (approximately); and at 30%: 750 * .055 * 0.3 = 12.38 Amp (also approximately). Approximately because pixel to pixel their amperage varies a bit and voltage drop down a string causes amperage change as well. The formula as it is will get one in the 'ballpark'. Something about supplies though that is sometimes overlooked. Wattage rating isn't necessarily a good value to design from. For example: Meanwell's LRS-350-5 supply while called and considered a 350 Watt supply can only deliver 60 Amp on its (DC) output before going into an overload condition. That 60 Amp and 5 Volt calculates to only 300 Watt deliverable. The supply's datasheet shows what's what. [/QUOTE]
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