Shinechip12V 3A Power Supply (36W) for LED Strips and Cabinets
Updated 2026-11-01 · Shinechip engineering team
A 12V 3A power supply delivers 36W. Sized at 80%, it carries about 29W of LED strip — roughly 3 m of 9.6 W/m strip, or a two-shelf cabinet run. Above that, use a 5A model so the supply is not running at its limit.
Models and specs
HM Slim 12V LED Power Supply, 18W to 72W, 220V AC Input
| Input voltage | 220V |
| Output voltage | 12V DC |
| Max load | 72W 60W 48W 36W 24W 18W |
Ultra-Slim 220VAC to 12V DC Switching Power Supply, 18-120W
| Input voltage | 220V |
| Output voltage | 12V DC |
| Max load | 72W 60W 48W 36W 24W 18W |
How to choose
- 3A is the most common size for a kitchen cabinet run: 3-4 m of mid-power strip lands between 25W and 35W, which a 36W unit covers with a workable margin.
- The 36W rating applies at the output, not at the wall. Input range matters more than wattage when the site is on 110V or a generator — check the input column before ordering.
- Keep the cable run short or go up a size: 5 m of 0.5 mm2 at 3A drops about 1V, which is 8% of 12V and visible as dimming at the far end.
Frequently asked questions
How many watts is a 12V 3A power supply?
36W. Usable LED load after 20% headroom is about 29W.
Can it power 5 m of LED strip?
At 4.8 W/m, 5 m is 24W and fits. At 9.6 W/m, 5 m is 48W and needs a 5A (60W) supply, or a 24V strip at half the current.
Is 3A enough for a mirror with a defogger?
No. A defogger pad of 40-60W must be on its own circuit or a dedicated defogger output; the LED supply should carry only the strip and switch electronics.
Specifications are from our product listings. Confirm the version and load before ordering.
Parts to use
FeaturedHMHM Slim 12V LED Power Supply, 18W to 72W, 220V AC Input
FeaturedUltra-SlimUltra-Slim 220VAC to 12V DC Switching Power Supply, 18-120W
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