The LED in question is designed to be mounted in an array to light up the side of a building, its not really supposed to be used like this but its the only thing I can find at the right voltage.
But I am now, probably, going to be taking power off just one of the batteries to give me 22.2v and 18.5v, much easier to deal with.
Will you use balance connector to take these voltages or use an voltage regulator?
Already thought about use 5V of the TZ85 that you not use BEC? The "out" red wire on esc connector.
If he is using the BEC from the TZ85's, he can use the BEC from the brushless controller to power the light, confirms power going to the speedo.
Exactly what i said David,
Normally who use TZ85 "cut" the red wire from one ESC, he can use this voltage to turn on the light.
If I remember rightly the CC HV ESC's are Opti isolated?
Yup, no HV castle escs come with built in bec's.
Sorry to almost hijack here, but is there a guide for how you'd go about wiring an LED to a bec on a tz85a? Just on account of there only being one wire, not sure how to do it properly...
Do you have a link to the 48V LED? A nominally 50W high voltage LED is made up of strings of LED elements on the same chip and looks something like this:
If that is really what you are proposing, its quite dangerous! A 50W LED is about the same as a 250W incandescent light and is blindingly bright - looking directly at it for even a short time is not good for your eyes.
I don't see what the problem is with using lower voltage LEDs off only one battery or with a larger dropping resistor. even if you use a very bright 1W LED, the pack supplying it will only be slightly more depleted after 3 minutes and since you are charging the packs separately, that pack will just take a fraction more charge to be back to full and equal with the other pack.
I looked up the specs. on a 60,000 mcd LED that is unpleasantly bright to look at and from a 22.2V 6S pack it needs a 680 ohm, 1W resistor. Total circuit power dissipation is only 29.3mA, which is totally insignificant. If you wanted to run the LED off 48V, you just need to double the resistance and power rating. The closest common part is a 1.5K, 5W resistor.
To run a LED off any BEC you will connect the LED and a dropping resistor in series between the red (positive) and brown or black (negative) wires of the servo cable. You need to find the specs. on the LED and plug the voltage drop and current consumption into a LED resistor calculator to find the right resistor value to use.
Got to go to work so I haven't read the replies, but I bought a regulator that will drop the voltage to 24V off RS yesterday so I will wire 2 sets of 12V LEDS's in series to give the 24V I need.
Problem solved... sort of.
Last edited by Eventorizon; 31st March 2014 at 07:23.
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