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12-27-2017, 02:31 AM | #1 |
Newbie Join Date: Dec 2017 Location: China
Posts: 1
| How do I add more devices by pulling voltage from existing outlets
I have a power distribution board for my Quadcopter. It is powered by a 3s Lipo and the following are connected:
I don't have any additional outlets. Question is, how do I add more devices by pulling voltage from existing outlets by connecting in parallel, as the Volts will be the same. I understand Amps will get divided.
Based on the specification of LIPO and power dist module below, is there a way I can determine the max devices I can connect to both 5V and 12V outlets on my power distribution module? here is the spec of my power distribution module: General:
ESC outputs:
BEC 5V output:
BEC 12V output:
BEC 12V @ 3S LiPo
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12-27-2017, 04:00 AM | #2 |
I wanna be Dave Join Date: Jun 2016 Location: Austin
Posts: 6,011
| Re: How do I add more devices by pulling voltage from existing outlets
This isn't an aviation R/C site, it's a R/C rock crawler land vehicle forum... I recommend you try using Google to find the proper forum for your question. |
12-27-2017, 08:54 AM | #3 |
Rock Crawler Join Date: May 2016 Location: SoWIs
Posts: 618
| Re: How do I add more devices by pulling voltage from existing outlets
First off, you calculate how many things you can power by the continuous amps needed by all of them MINUS the continuous amps the regulator on the distro block can provide. For 5V it's 2 amps continuous, for 12V it's 0.5 amps but only if using a 4S. You answered your own question on adding devices - you wire more in parallel to the existing devices. Use a y-harness or solder wires on top of the existing devices' wires. Since it's a 3S battery, you shouldn't use the 12V BEC output for any device unless it absolutely can't run on more than 12.0v (most 12v devices can do 13-14v max). When you power a linear regulator, the max out put voltage will be 1v less than input, so on 3S max will be 11.6v to start and 9.8v when the battery is empty. The additional 5V and 3.3V regs should tie into the INPUT of that distro block to get power direct from the 3S battery. Running a regulator off a regulator just compounds inefficiencies. If you need to extract the max runtime from the battery, look for "switch-mode" regulators. Linear regulators get more inefficient, in a near-linear fashion, as output drops below input. A 5v reg fed from 12.6v dumps over 150% of the power used AS HEAT. A switch-mode reg would only dump about 10-15%. |
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