wesinatorThis 14W panel comes with a battery pack capable of 2A in/output. It's also made and serviced by a US, California company, vs the Chinese companies on Amazon.
psynapzYou can actually find battery packs with 2A input. The problem with cheap solar panels is lower efficiency - 15% or less, while this pack is claimed to have 19% efficient panels which is the highest on the market right now. Cheap ones also will last not as long as this one, if you intend to keep it for a few years anyways. Efficiency is important because you can get more juice with less light. Those 20W panels for $50 will be nowhere close to 20W in real conditions for 99% of the time (not unless you live in Sahara that is :) )
BTW, it doesn't really matter where it's made, the components still come from China ;)