LED battery drain

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hamrajw

Member - Posts: 41

Joined: July 02, 2002

Location: United States

Posted: November 03, 2005 at 11:02 AM / IP Logged

I wanted to know how much of a draw LEDs have. Basically, will leaving them on run down the battery. I'm thinking about 20 LEDs.

Thanks

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Oznium

Member - Posts: 24

Joined: November 14, 2004

Location: United States

Posted: November 03, 2005 at 1:48 PM / IP Logged

Each LED is about 20mA which NOTHING

It will not run down the battery. Maybe after a year it would LED battery drain -- posted image.

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hamrajw

Member - Posts: 41

Joined: July 02, 2002

Location: United States

Posted: November 03, 2005 at 1:58 PM / IP Logged

Thanks for the help. That might make me want to do more stuff.

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cowboy21

Copper - Posts: 64

Joined: October 31, 2005

Location: Australia

Posted: November 03, 2005 at 4:37 PM / IP Logged

GO NUTS with leds, i have way over 100 on my car and i leave it on overnight all the time and nothing the battery goes fine. LED battery drain -- posted image.

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schnupper

Member - Posts: 12

Joined: November 24, 2005

Location: United States

Posted: November 26, 2005 at 12:54 AM / IP Logged

LEDs hardly draw any amprage. You can have like 100+ and you still wouldnt have a large paracidic load on the battery. You would be fine leaving your LEDs on all night and your car would start up like nothing.

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KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: November 26, 2005 at 9:03 AM / IP Logged

You could actually calculate it all out. You can figure out the current draw of the LEDs you are using by knowing the resistor value(s) involved.

20 LEDs at 20mA would equal 400mA. Thats just under a half amp draw. I wouldn't want to leave that guy of draw on my battery for an extended amount of time. For a 20mA draw you would need a resistance of 250 ohms going ot EACH LED (which is somewhat low, unless you are going super super super bright)

I would imagine, for super bright LEDs, the current would be closer to 10mA a piece, which is a 470 ohm resistor in line with each one, but every application will differ.

Kevin Pierson

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LED battery drain

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