Re: Re: [VAL] LED-Solar panels in NYC

["Dr.Gerald N. Johnson" <geraldj@xxxxxxxxxxx>]

14.6 volts is a bit high for long battery life. 14.2 is better, 
though 15 used to be within SAE limits. Its too much for good 
battery life.

Though I wonder for the LED controls if the gradual failures are 
the LEDs or the circuitry. Good circuits should control the LED 
current pretty much independently of the supply voltage but at 
the cost of extra power dissipation in the control circuit when 
the supply voltage is high. Sometimes resistors drift in value 
when run hot. And some could change the brightness of the LEDs. 
At the same time, driving the LEDs very hard gets more light at 
the cost of LED lifetime.

Without circuit details, I can't pass judgement.

Gerald J. VAC, WBCCI #5623