Maverick of Maverick Solar put the IkePak together to help his son after Hurricane Ike. He did not spend time doing extensive calculations, but just used what was readily available — he runs a solar energy company, so he probably has a few relevant things available — or easily obtained at the local WalMart. The wheeled Igloo cooler holds a marine battery, a 400W inverter, a solar charge controller, an inline fuse for protection, and most of the wiring. It provides enough power for a few CFLs, a small TV, and a cell phone charger. The total cost was ~ $360; the most expensive item was the $175 20W solar panel.
Additional pictures and details are the link below.
IkePak [Maverick Solar]