Things to get

Pure sine wave inverter >= 600W (Samlex is good)

Inverter hookups

Two 6v deep cycle batteries. Lowes has the Deka GC15 6v, 230Ah battery for $144 with free shipping to the store — an excellent deal.

Solenoid battery isolator

Wiring to connect alternator to isolator and isolator to battery bank

PowerPole connectors for running 12v accessories directly from battery bank