Hi I'm using Brushless motors. I've read somewhere that the battery to ESC has to be no more than about 20cm. I was planning to use a land based 12v battery down a 30m umbilical to provide motor power, but if this is true I will need to use an onboard battery. What is people's experience with using brushless motors.
Thanks
Brushless motors and battery power
Re: Brushless motors and battery power
Hello!
It is right that you should not run very long cables on low voltages, as the voltage loss is huge. What you might end up with is actually heating the cable instead of delivering the power. The only way to counter high voltage drop when you run on low voltages is to choose a cable with a larger diameter.
This is the reason why they transform the voltage on power lines up to several hundreds of thousand volts. The voltage drop in the cable is low, and they can use very small cables!
Depending on how far down you are going, I would consider running 110/ 230V down to the ROV and then convert it to 12V DC for your engines.
It is right that you should not run very long cables on low voltages, as the voltage loss is huge. What you might end up with is actually heating the cable instead of delivering the power. The only way to counter high voltage drop when you run on low voltages is to choose a cable with a larger diameter.
This is the reason why they transform the voltage on power lines up to several hundreds of thousand volts. The voltage drop in the cable is low, and they can use very small cables!
Depending on how far down you are going, I would consider running 110/ 230V down to the ROV and then convert it to 12V DC for your engines.