For the past few weeks I've been shopping for a remote controlled car for my son, along with some batteries and a charger that will work with them and his other RC toys. To make a very long story short, it would be generous to say that the RC industry has many "standards" for it's electrical connectors. Rather, there appears to be an almost limitless menagerie of arbitrarily shaped plastic and metal pieces to connect batteries to their respective toys and chargers.
Consequently, the consensus advice I've received from friends, online research, and our local hobby shop is to cut off the heterogeneous connectors from our various components and solder on a standard type across our fleet. OK, I can do that.
I'm having difficulty, however, in choosing appropriately-rated connectors and wires, because I don't understand the safety implications in this application. I've done enough home wiring to choose the right wires/breakers/outlets/etc. for 120V AC. Unfortunately, I don't trust my layman's understanding of electrical/electronic principles to translate safe home wiring to safe RC car wiring.
The crux of the issue is that I'm seeing staggering numbers for some of these RC components - like 100A maximum draw for the car's electronic speed control (ESC) unit, or 65A for a high-performance brushless motor. I say "staggering" because the main breaker in my house is 100A, and we're talking about a little toy car here.
Of course, my house uses 120V AC, and this toy uses (nominally) 7.4V - 11.1V DC. So, my gut tells me that I don't need a big slab of metal like the main bus in my home's breaker panel to safely move electrons from the toy car's battery to its motor. I mean, 100A@120V has to be somehow "more" than 100A@7.4V, right? This is supported by the fact that the car comes with 12 AWG wires, not the hot dog sized cable that carries 50A to my oven, for example.
Still, in looking at spec sheets for my connector and wire options, most things seem to be rated based on how much current they can handle, without specifying a voltage. Similarly, I've read a number of posts on other forums that say essentially "amps are amps" for safety/heating purposes, regardless of whether they're AC or DC. Again, few mention voltage.
So, with all of that as context, my question is:
- Does either the type of current (AC or DC) or the voltage matter when choosing a safe connector/wire to carry a given number of amps?
To recap, I'm looking to standardize on connectors for, say, up to 15V DC over wires a few inches long. In practice, the current will probably be a few tens-of-amps. But, the battery is rated to discharge at 300A (no kidding!) and the thingy it powers (the ESC) is rated at 100A. So, I assume I should plan to use connectors that can handle 100A@15VDC.
Apologies for my verbosity; I just want to make sure that I neither burn down my son's new toy, nor our house. Thanks in advance for your help.