Question 1

How do I calculate how many LED power supplies I need?

Accepted Answer

Start with maximum LED load from cabinet or module datasheets. Add project headroom (typically 15-25%) for brightness peaks and environmental conditions. Derate each power supply for continuous operation (typically 80% of nameplate). Divide design load by usable supply watts and round up.

Question 2

Why should I derate power supplies to 80%?

Accepted Answer

Running power supplies at full nameplate output continuously increases heat, reduces reliability, and shortens lifespan. Most manufacturers recommend 70-80% continuous load. The exact derating should follow the specific power supply datasheet and local electrical practice.

Question 3

What is power supply headroom?

Accepted Answer

Headroom is additional capacity beyond the calculated LED load, typically 15-25%. It accounts for brightness peaks, future content changes, environmental stress (heat, altitude), and design margin. Projects with critical reliability requirements should use higher headroom.

Question 4

Does this calculator size breakers and wiring?

Accepted Answer

No. It estimates power supply count only. Breaker sizing, wire gauge, grounding, conduit, and electrical code compliance must be handled by qualified electrical engineers. Never use this as a substitute for professional electrical design.

Question 5

Should I use single-phase or three-phase power?

Accepted Answer

Small to medium indoor walls often run on single-phase power. Large installations, outdoor screens, and high-load setups may benefit from three-phase distribution to balance loads. Consult an electrical engineer for the actual installation.

Question 6

What happens if I use too few power supplies?

Accepted Answer

Undersized power supplies can overheat, shut down under load, or fail prematurely. Inadequate power can also cause visible brightness drops, flicker, or uneven screen performance. Always include derating and headroom in the estimate.