do NOT buy from bargaincell.com (and use caution, their products are for sale on amazon). i recently purchased a solar powered pump with battery for my water pond and the solar panel's glass was broken by a friend's over zealous little boy. i wrote to the company asking to purchase a replacement panel only since the rest of the system was still good.
they do not offer replacement parts, they expect the consumer to throw the entire system away and purchase the entire set over again. i find that ridiculous, unsustainable and a form of greenwashing.