Re: Inverter wiring, will this work??
The issue with too small a wire is its resistance - at high current flows it heats up, wasting some of the desired energy as heat. In extreme situations it could cause a fire hazard. Since power (watts) = volts x amps, at low voltage more current is needed to get the same power. 1200 watts is 10 amps at 120 volts, and 100 amps at 12 volts.
The issue with too large a wire is purely mechanical - supporting its weight, routing it, and making proper connections - ever tried to put #6 wire into a connector designed for #10? Done badly, this could become a high resistance point instead. With the proper support, routing and connection, larger wire is good.
You can figure out your wiring needs by adding up the power draw. Changing the equation around to amps = watts/volts, each 8 watt lamp draws 8/12 or 0.67 of an amp. #12 wire can support 20 amps at normal distances and temperatures.
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.