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How to battery power 12v LED strips? Answered

I was going to power LED strips using a mains supply adaptor but because I want to put these lights in the kitchen, under cupboards, I'd have cables going behind the cooker. That's a big safety risk so I'm scrapping mains power.

What solutions are there to battery power the LED lights. I'd like to recharge batteries instead of put new batteries in every few days. Also I don't want to use like 8 AA batteries. I've seen 12V lithium batteries that look like AA batteries. Can I recharge those? And how so? Where do I get a recharger from?

Thank you for any suggestions you may have : )




Best Answer 3 years ago

What would be wrong with a isolated switch mode power supply? They will supply a precisely regulated voltage to the LEDs, or regulated current, depending if it is in CV or CC mode of operation, and it will be completly isolated from mains.

A battery would be a PITA to keep recharging. Even if you do not use the light often, any battery will still self-discharge.

You can just google into a LED driver power supply, use a wall wart power brick, even modify a phone charger or laptop battery charger or xbox power supply! All of these are either SMPS, or at least a unregulated transformer + AC to DC converter (using the classic 4 diodes and smoothing capcitor)

Yes you can get small 12V lithium batteries and the place you buy them should have the proper charger for them as well.

Is your only outlet behind the cooker?

Those are designed for systems that don't use the batteries all that often like a key fob for your car. They will not support you LED strip lights. At least not for any usable length of time.

Hmm I thought so... So what would be an example of a suitable battery I can mount under the cabinet?

Thank you, a suitable example would be good to see. No, the outlet is not behind the cooker, but the cupboards are on either side of the cooker and I don't want to connect them using cables because that would run behind the cooker.

Hello! You helped on another question, didn't you? I've just thought of something, I'll have the 2nd set of lights connected up using some sort of clip on, clip off cables when the cooker isn't on. See how it goes. Thank you : )

If your cooker is safe to be on, its safe to run wires behind.

Sorry, how(or where) do I find that?

Don't be too concerned about the wiring.
I use two different setups, depending on the need of the customer:

a) drill a small hole through the cupboard, preferable in a corner and feed the cable through there. I use a thin sensor cable with two wires inside for this as it is thin, flexible and easy to fix in place with a drop of hot glue.

b) using the same type of cable I put the cable inside a thin cable protector - the kind you use on floors to prevent tripping hazards.

A is my prefered option as you won't have anything looking bad, inside the cupboard I usuall cover the fixed cable with some acrylic in the right color (can be peeled off again ulnike silicone).

In any case I go to the back and in most cases connect to the power supply of the range hood.

Sometimes I have to change to a double outlet there though...

Using batteries is an option but depending on the overall power consumption it would be much easier to use a small, sealed lead acid battery.

They can be recharged and are also alvailable in the prefered "deep cycle" version which allows for ongoing charge and discharge, the normal ones are more for high power demands.

And I think in the long run the lead acid battery comes alot cheaper than other alternatives.