author
3CommentsAustin, TexasJoined May 6th, 2011

Tell us about yourself!

Complete Your Profile
  • dmorningstar commented on tm182's instructable Homemade LED Solar Lamp5 months ago
    Homemade LED Solar Lamp

    3V 80mA would give you about 15 minutes of life if you figure up the LEDs are running @ 20mA each. that seems like a real short life - very ineffective. what kind of current are you seeing in full sunlight on your photovoltaics?

    That's going to depend on your voltage- im assuming you are using a high powered LED like an Endor Star or similar MCPCB. im simple terms, you would need a power supply of correct voltage and with enough CAPACITY to run the LED(s) effectively. lets take a simple example:you have an LED with a forward voltage of 3.5V and you want to run it at 1000Mah, amperage runs a little differently than you are thinking in this situation.we have an 18650 battery rated at 3.7V and a capacity of 2000 Mah or 2A that means we would get about 2 hours of bright LED then it would start to fade out. - if this guys pic is correct, than you are going to get about 8 hours at 3A or effectively 24A worth of charging time. so in this case, yes you would be able to run this - although id add additional charging ci...

    see more »

    That's going to depend on your voltage- im assuming you are using a high powered LED like an Endor Star or similar MCPCB. im simple terms, you would need a power supply of correct voltage and with enough CAPACITY to run the LED(s) effectively. lets take a simple example:you have an LED with a forward voltage of 3.5V and you want to run it at 1000Mah, amperage runs a little differently than you are thinking in this situation.we have an 18650 battery rated at 3.7V and a capacity of 2000 Mah or 2A that means we would get about 2 hours of bright LED then it would start to fade out. - if this guys pic is correct, than you are going to get about 8 hours at 3A or effectively 24A worth of charging time. so in this case, yes you would be able to run this - although id add additional charging circuit.

    View Instructable »