Installing LED strip lights under deck railing using batteries.

Hello! I would like to install roughly 5.5' Of LED strip lights beneath my deck railing for nightime use. Can anyone recommend an LED strip lighting system with the appropriate specs to light the deck beneath and the battery set up needed for such a system (preferably using C batteries or smaller)? I am completely new to this, but am excited to try it out!

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Downunder35m8 months ago

Ok, just to sum it all up:
If you want to stick with LED strips avoid chinaware, do some digging and opt for something from a reputable manufacturer / company that has a good warranty.
In case you are on a budget take a china strip but with super bright LED's that you run on under 12V as Iceng already pointed out.
Good thing here is that super bright LED's still offer more light output on a lower than rated voltage as standard ones on full 12V - plus they last a lifetime this way.
I used a superbright LED in my projection clock after the original failed.
Running on 18 instead of 26mA now for 8 years 24/7...
As for the connection and battery supply:
I would suggest to use a battery pack offering 15V, so 10 C-cells in an easy to access tube or similar.
As a cheaper alternative go for 18V and 3 lantern batteries - they use 4 D-cells in each battery and are quite easy to solder together.
If you want to safe size and get an easy rechager option then take two 7.2V rechargable batteries as used in RC cars or boats - the higher the amp hour rating the longer they will last.
To get the brigthness you desire and the correct voltage you use an efficient and adjustable step down converter.
For the strips you get ready made connctors with two wires that you can solder on.

You might wonder why I suggest such high supply voltages, so let me try to explain:
Your LED's require 12V for full brightness but we want to go lower anyway.
Selecting a matching battery voltage means the brightness will decrease quite quick and the batteries become useless as they can't supply the power they had when full.
Going up with the supply and using a step down converter (or for smaller power levels maybe just an adjustable voltage regulator) allows to use the batteries until their combined voltage drop is below what the step down converter can handle.
So you can use the batteries until depleted without compromising brigthness ;)
This is especially helpful when using rechargable batteries as they should not be used below their minimum voltage.

Kashmerem (author)  Downunder35m7 months ago

Okay, I think I'm close. I'm thinking to use the LED strip depicted below [] and the above step-down converters with pictures below. I want to try running the 12V LEDs on batteries: alkaline C batteries at 8x1.5v = 12v and also NiMH C batteries (5,000 mAh) at 12x1.2v = 14.4v. Any thoughts or warnings for me? :-) Do you think I should use more batteries in both cases?

Kashmerem (author)  Downunder35m7 months ago

Would one of these converters work better than the other?

For the converter, I thought to do the 700mA, wire option for a strip generating 680mA, with 14-15V input to the 12V strip.

-Thank you

Kashmerem (author)  Downunder35m8 months ago

Wow! Thank you so much for your insight. Both you and iceng have been more than helpful. I will see what I can put together with such great advice!

Vyger8 months ago

Looks like the others have taken given you some good options. If you want a few more choices you can read through these instructables. These are dor stuff that is all on ebay

Vyger Vyger8 months ago

Kind of strange that it published the unedited version of what I wrote. I deleted the "taken" and changed the dor to for but it ignored my changes. Twlight Zone stuff.

iceng Vyger8 months ago

The robot was made in the Zone...

Kashmerem (author)  Vyger8 months ago

Hey Vyger, thank you. That really is helpful.

Downunder35m8 months ago

I can not really recommend standard LED strips, especially if waterproof and even less if off Ebay.
I had several different brands and lenghts for various uses.
No strip so far had still all LED working after the first year.
IMHO the better option is to use these LED disk lights as used for under kitchen cabinets.
They are available in waterproof too and often you can choose between 12V and 240V.
12V would be fine for outdoors and you only need a suitable 12V downlight or LED transformer to run them.
Best part is that if one light would fail it is quite easy to replace, while a LED strip is a pain in this regard.

Kashmerem (author)  Downunder35m8 months ago

Thank you for your insight! That is also a great idea. For my purposes, I prefer the look that the LED strip lighting gives. Perhaps I can find a higher quality brand...

That's scary failed before a year :( ... I did buy a blue strip from Radio Shack 4 years ago for a costume, it is still running but at 9Volts instead of 12v...

iceng8 months ago

Here you can buy 2 meters = 6.5 feet of warm white 12 volt led strip.

These 120 waterproof leds can be trimmed every 3 leds with scissors.

5.5' works out to about 99 or102 leds

iceng iceng8 months ago

There are 34 groups of three leds, each group uses 20ma which means 680ma or o.68 amps at 12 volts.

If you want run it for a 12 hour single night you will need about a 10 amp-hour 12 volt battery... And that works out to 8 NiMH D cell batteries in series...

I would recommend a simple12 VDC 1A wall-wart or a small car battery with a solar panel re-charger.

Kashmerem (author)  iceng8 months ago

Thank you for your response and ebay link! So, if I used C batteries instead due to the size of the recess under my railing, would I need 10 C batteries? Also, what would be an easy way to connect battery power from the batteries to the LED strip?

Thanks again!

iceng8 months ago

There are waterproof led strips that run on 12 volts.

What color ?

Kashmerem (author)  iceng8 months ago

Warm white would be great.