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Add up the power of all strings or strips at full white (stated in every item) and choose a power supply with the same voltage that is loaded to no more than 80 %. With pixel strings, also inject power again at every connection between two strings using a T-connector.
Note: Connection to 230 V must be carried out by a qualified electrician.
If one power supply is not enough, split the installation across several power supplies.
Example: 500 pixels at 12 V
10 pixel strings at 12 V with 50 pixels each, laid in 2 runs of 5 strings:
Power: 10 × 36 W = 360 W
With reserve: 360 W ÷ 0.8 = 450 W
Split across 2 power supplies, 180 W ÷ 0.8 = 225 W per run, for example 2 × 12 V / 324 W
T-connectors: 10 strings − 2 runs = 8 pieces
Where to inject power
The wires in pixel strings are thin (see the guide Cable cross-section: mm² and AWG). Over the length the voltage drops, and at the end the pixels get darker or the colours are no longer right. At the start of a run, power comes through the connection cable. At every further connection between two strings, inject power again with a T-connector (power injection).
Number of T-connectors = strings − runs. Not just every second connection: two 100-pixel strings together draw up to 12 A, while one connector contact can carry 10 A at most.
Power supplies for indoors and outdoors
Power supplies rated IP67 have a fully potted housing and are suitable for outdoor use. Power supplies in a metal housing without an IP rating are intended for installation, for example in a control cabinet, and must be protected from moisture. The rating is stated in each item.
Frequently asked questions
Why 80 % and not 100 %?
The table values apply to full white, i.e. the highest consumption. With 80 % there is reserve left, and the power supply does not run permanently at its limit.
Do effects need less power?
On average yes, because all pixels rarely light up white. But the power supply must handle the brightest moment of the show. So plan with full white.
What happens without additional power injection?
At the end of the string the voltage drops, the pixels get darker or the colours shift. How this differs for 12 V pixels is explained in the guide Resistor or regulated?.
Is the T-connector also available for JST-SM?
The T-connector in our shop is for the xConnect® plug system. You will find all connectors and cables under Connectors & cables.
Planning a larger installation? Tell us about your project and we will work out the power supplies and injection points with you.
