# Number of Power Injections every 50 cm?

**URL:** <https://wled.discourse.group/t/number-of-power-injections-every-50-cm/8091>\
**Category:** Issues\
**Created:** [April 21, 2023, 10:54pm UTC](https://wled.discourse.group/t/number-of-power-injections-every-50-cm/8091 "2023-04-21T22:54:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Knubbi](https://avatars.discourse-cdn.com/v4/letter/k/958977/32.png) [@Knubbi](https://wled.discourse.group/u/Knubbi)\
**Post date:** [April 21, 2023, 10:54pm UTC](https://wled.discourse.group/t/number-of-power-injections-every-50-cm/8091/1 "2023-04-21T22:54:28Z")

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Inject power “every 150 LEDs” they say.

Common connectors are JST-SM connectors which support max AWG 22 with 0.92A\_max ([American Wire Gauge Chart and AWG Electrical Current Load Limits table with ampacities, wire sizes, skin depth frequencies and wire breaking strength](https://www.powerstream.com/Wire_Size.htm)).

However, if every pixel takes around 0,06A, you would need to inject after every 15 LED (0,92A/0,06A) to cover peak performance,

On a 30LED/m strip, this would mean an injection after every 50cm.

Wow, this will be a lot of soldering. Or am I wrong?

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**Author:** ![divsys](https://avatars.discourse-cdn.com/v4/letter/d/a3d4f5/32.png) [@divsys](https://wled.discourse.group/u/divsys)\
**Post date:** [April 22, 2023, 6:48am UTC](https://wled.discourse.group/t/number-of-power-injections-every-50-cm/8091/2 "2023-04-22T06:48:19Z")

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Depends on whether your assumptions are correct.

Good ampacity tables reference the resistance of a given wire gauge over a given length rather than just a maximum current.  
A piece of 22AWG wire can easily carry 10A or more with little change to your LEDs - if it’s short enough.

Similarly the “rule of thumb” for LEDs is often 0.3W/LED. That’s sufficient to get you a good size power supply that can reliably drive hundreds of LEDs. The precise draw of an LED in your strip can only be perfectly predicted by measuring some sample devices.

A digital multimeter with a 10A current scale is very helpful.

Measuring the actual voltage drop along your strip under “100% White” loading will always give you a better idea of how many injection points you might need.