Whether you're a glamping enthusiast or just a gadget-addicted park lover, you'll need more than a simple battery pack to get through the day. It's also the season for outdoor adventures, usually far from hardwired power sources, so Monoprice timed the release of its PowerCache 220 AC inverter well. This portable device, which launched today, can be juiced up from an outlet, a car lighter or the company's soon-to-be-released 8- and 15-watt solar panels to provide enough juice for "a 30-watt fan for seven hours or a 65-watt computer monitor for three hours." It's sealed lead-acid battery can be tapped through a multitude of ports, including four USBs, two 120-volt AC outlets, a cigarette lighter receptacle and two 5.5mm DC jacks for connecting Monoprice-branded LED lighting. This week, three lucky Engadget readers will get a PowerCache 220 for all their on-the-go energy needs. All you need to do is head to the Rafflecopter widget below for up to three chances at winning!

UPDATE: Monoprice has corrected some of the information they originally listed in regards to expected usage times for the two items above. The updated info has been entered for those examples.

Winners: Congratulations to Ryan B. of Hampstead, MD, John R of Lisle, IL and Mark A. of Fayetteville, AR!