Solar Power LED Array (Dead Simple) - Page 2 - Electronic Circuits Projects Diagrams Free

audioguru · 25th June 2007, 02:30 PM

A street light is at least 400W. 50 very expensive Lumileds LEDs won't be as bright.
A solar panel to charge a huge battery would cost a fortune for the 400W load.

paladin · 25th June 2007, 04:49 PM

Using two small solar panels to charge the NiMH batteries can easily be accomplished with a simple dc-dc converter integrated circuit that will output a few milliamps with a voltage as low as .6 volts and the ambient current loss in a non charging mode is in the microamp range. It could stay "turned on" all the time. A switch to activate the LED's could use a chip exactly like the one for charging to operate from the batteries with a simple 3 wire lead regulator like the Zetex version of the 78L03 using 2 small resistors in a current regulator. Two simple I.C.'s, a 3 pin regulator, maybe half dozen resistors and two small capacitors.......depends on how small you want to build it, how good your eyes are, how steady is your hand and can you hand solder tiny little surface mount parts....

simoin · 26th June 2007, 07:44 AM

Mathsgene - The simplest way I can think of to do it is get some sort of relective perspex and make a mold for it and stick it in the oven for a bit and press it into the mold until it cools. That would be a simple and cheap weay to do it, you could use two bits and stick a piece of tinfoil between the sheets of perspex for a more reflective piece.

mathsgene · 30th July 2007, 10:03 AM

Quote:

Originally Posted by simoin

Mathsgene - The simplest way I can think of to do it is get some sort of relective perspex and make a mold for it and stick it in the oven for a bit and press it into the mold until it cools. That would be a simple and cheap weay to do it, you could use two bits and stick a piece of tinfoil between the sheets of perspex for a more reflective piece.

Simeon
i so much respect your unwavering understanding of new members like me. To fix the structure is not my problem but all i want is the circuit that will be simple and efficient, that can make it bright with a solar panel of 40 watts.

chipi · 23rd October 2007, 08:26 PM

( simoin )the equation you need to use is v
I*R .( v over i times r ) YOU CAN WORK LOTS OF THINGS OUT WITH THIS. REGARDS

Edy_Tse88 · 25th November 2007, 11:34 AM

Hi everyone,
My name Edy. I'm new to PIC. I'm trying to do the sinewave inverter 12 Vdc to 220 Vac using PIC16F877A and 12 Mhz Crystal. Can i get the assembly code for frequency 50 Hz or 60 Hz. Please help me. Everyone who know the code in assembly please e-mail me at edy_tse88@yahoo.com. Thank's.

Hero999 · 25th November 2007, 12:13 PM

No, please post on topic and start a new thread rather rerailing this one.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

25th June 2007, 02:30 PM	#16
audioguru	A street light is at least 400W. 50 very expensive Lumileds LEDs won't be as bright. A solar panel to charge a huge battery would cost a fortune for the 400W load. __________________ Uncle $crooge

25th June 2007, 04:49 PM	#17
paladin	Using two small solar panels to charge the NiMH batteries can easily be accomplished with a simple dc-dc converter integrated circuit that will output a few milliamps with a voltage as low as .6 volts and the ambient current loss in a non charging mode is in the microamp range. It could stay "turned on" all the time. A switch to activate the LED's could use a chip exactly like the one for charging to operate from the batteries with a simple 3 wire lead regulator like the Zetex version of the 78L03 using 2 small resistors in a current regulator. Two simple I.C.'s, a 3 pin regulator, maybe half dozen resistors and two small capacitors.......depends on how small you want to build it, how good your eyes are, how steady is your hand and can you hand solder tiny little surface mount parts....

26th June 2007, 07:44 AM	#18
simoin	Mathsgene - The simplest way I can think of to do it is get some sort of relective perspex and make a mold for it and stick it in the oven for a bit and press it into the mold until it cools. That would be a simple and cheap weay to do it, you could use two bits and stick a piece of tinfoil between the sheets of perspex for a more reflective piece.

23rd October 2007, 08:26 PM	#20
chipi	( simoin )the equation you need to use is v IR .( v over i times r ) YOU CAN WORK LOTS OF THINGS OUT WITH THIS. REGARDS Last edited by chipi; 23rd October 2007 at 08:29 PM.*

25th November 2007, 11:34 AM	#21
Edy_Tse88	Hi everyone, My name Edy. I'm new to PIC. I'm trying to do the sinewave inverter 12 Vdc to 220 Vac using PIC16F877A and 12 Mhz Crystal. Can i get the assembly code for frequency 50 Hz or 60 Hz. Please help me. Everyone who know the code in assembly please e-mail me at edy_tse88@yahoo.com. Thank's.

25th November 2007, 12:13 PM	#22
Hero999	No, please post on topic and start a new thread rather rerailing this one. __________________ I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong. Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.