Review Content Great product Backup battery source and camping trips where power is required no gas needed.. NIce Nice to have something to charge all my little electronics when the power goes out on the East Coast winter months Great portable alternative emergency power source. Having a portable alternate power source, like the Goal Zero Yeti 400, in an extreme emergency is priceless. Recharging cell phones, laptops and radios, along with being able to run a TV or fan is a great plus. We purchased the bigger Boulder 30 solar panel, and it was a great addition. It will fully charge the Yeti 400 in 10 to 12 hrs. Also, the easy to read display on the Yeti is simple and easy to read. I have purchased other cheaper portable generators in the past, but the Yeti beats them all. If you are contemplating a generator for emergencies, this is the one to get.