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12 V power supplies, adapters, batteries and wire for LED signs
Our signs run on 12 V DC LEDs. The power supply, often called a sign transformer or LED driver, turns the building's 120 V into 12 V. When a sign goes dark or a letter starts to flicker, it is one of the first parts to check. Indoor versions are often called AC/DC adapters or plug-in transformers.
Pick by where the sign is:
- Outdoors: the outdoor LED sign power supply is a UL-listed 12 V driver in an IP67 waterproof metal case, in 60, 100 or 150 W. Its 100 to 130 V input is hard-wired, so a licensed electrician connects it.
- Indoors: the plug-in power adapter is a UL-listed 12 V adapter with a US wall plug, in 24, 36 or 60 W, for lit letters, logos and small lightboxes.
- No outlet at all: the rechargeable battery pack runs small 12 V signs and halo letters from a slim box with a remote and USB-C charging.
Size a supply with headroom: keep the LED load at or below about 80 percent of the rating, so the supply runs cooler and lasts longer. The guide to channel letter power supplies walks through the math, and sign electrical requirements covers what to ask your electrician.
Replacing a supply? Read the old label first: it should say 12 V DC output. A 24 V supply or a glass neon transformer is a different part. To carry power from the supply to the letters, use 18/2 low-voltage wire, and keep 12 V runs short so the far letters do not dim.
- Read the old label first: output volts and watts tell you what to replace it with.
- Keep the LED load at or below about 80 percent of the supply rating.
- Plug-in adapters are for indoor use only; outdoor signs need a hard-wired outdoor supply.
- Long 12 V runs lose voltage, so mount the supply close to the letters and use 18/2 wire.
- Connect letters in parallel: every positive lead to the positive output, every negative lead to the negative.
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12V LED Sign Power Supply, Outdoor IP67, UL Listed, 60 to 150 W
UL-listed 12 V DC power supply (LED driver) for outdoor channel letters and LED signs: IP67 metal case, 100-130 V AC input, 60, 100 or 150 W.
From $29.99 · 3 options
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12V Plug-In Power Adapter for Indoor Lit Signs, UL Listed
UL-listed 12 V DC plug-in adapter (transformer) for indoor lit letters, logo signs and lightboxes: 100-240 V input, 5.5 x 2.1 mm plug, 24, 36 or 60 W.
From $14.99 · 3 options
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Rechargeable Battery Pack and Remote for Lit Signs, 12V
Rechargeable 12 V battery box with a remote for halo letters and small lit signs where there is no outlet; USB-C charging, slim enough to hide.
$220.00
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18/2 Low-Voltage LED Wire, Red and Black, Pure Copper, 50 or 100 ft
18 AWG two-conductor wire, red and black stranded pure copper, for the 12 V side of LED signs: power supply to letters and letter to letter.
From $16.99 · 2 options
Questions
Which power supply does my sign need?
Add up the watts of the LEDs and choose a 12 V supply so the load is no more than about 80 percent of its rating. Use an outdoor hard-wired supply outside and a plug-in adapter indoors.
12V Plug-In Power Adapter for Indoor Lit Signs
12V LED Sign Power SupplyCan I replace a neon transformer with one of these?
No. Glass neon uses a high-voltage neon transformer. These supplies are for 12 V LED signs only.
Who connects an outdoor power supply?
A licensed electrician, because the input is hard-wired to line voltage. The 12 V side then connects to the sign's positive and negative leads.
Are your power supplies UL listed?
Yes. The power supplies and the LED modules in our signs are UL-listed components.
12V LED Modules for Channel LettersWhat if there is no outlet where my sign goes?
For a small 12 V sign, the rechargeable battery pack with remote runs it without an outlet or an electrician. Run time depends on the sign, and we confirm it for you.
Rechargeable Battery Pack and Remote for Lit SignsHow can I tell if a power supply has failed?
If every letter on that supply goes dark or flickers at once while the circuit has power, the supply is the usual suspect. An electrician can confirm it by measuring the 12 V output with a meter.
How far can the supply be from the letters?
As close as is practical. Long 12 V runs lose voltage and the far letters look dimmer, so use heavier wire or a second supply near those letters.
12V LED Sign Dimmer with Wireless Remote