[simplechamp]

It's not so much the voltage, but the current. The power loss due to resistance is I^2*R. By switching to a connector with lower resistance you can reduce those power losses. Same thing goes for switching to thicker wire and/or shorter lengths of it. Dean's work fine, but there are connectors available that have lower resistance. It really comes down to how concerned you are with efficiency. Any losses at the connector are being taken away from driving the vehicle.

In terms of voltage, a higher voltage setup is actually better for reducing connector power losses (compared to a lower voltage setup producing the same power e.g. geared for same speed). It's the same I^2*R equation, this time reducing current instead of resistance.