Needing something to power my CPAP machine while camping, I chose the Jackery Explorer 240 and it has surpassed both my needs and expectations. This is an update as I have enjoyed using the Jackery Explorer 240 numerous times over the past year. The E 240 continues to provide consistent power to my CPAP machine. On numerous occasions I have used the unit for 5 nights of uninterrupted power, mostly in the 8-9 hours range of CPAP use. Never have I experienced any type of auto-shut off as others have commented on. The E 240 packs nicely in its carry bag, is light weight and fits in the corner of the tent next to my CPAP machine. It recharges quickly and stays recharged for months, while in winter storage. When I was first considering this purchase I debated the need for the solar option to recharge while in the field. Now that the E 240 has proven I can get 5 nights of use, which is the extent of my normal time out, I'm glad I did not spend the extra. The Jackery Explorer 240 has proven to be one of the best camping lifestyle purchases I have made.