these are about the most effishant(watts per sq inchs)of the panels i considered size matters when you may have to ship or carry panels to a remote area. these are ups shipable and even fit into my dodge neon(2 panels) if i want to hilltop or rove with the ham gear.\r\n\r\nplease see my reviews and albums for the Outback flexmax 80 the album documents the field day use.