Which solar panel to buy

[threedogs]

@ ET wired the pos and neg from the 80 watt BP solar Panel to the pos and neg on the solar icon on the controller
then wired the pos and neg to the battery icon terminating in a 50 amp anderson plug.
with my multi meter I have 19v from the Panel and 19 volts at the anderson plug.
what have I done wrong other than buy a cheap controller lol

http://www.ebay.com.au/itm/30A-12V-2...752&rmvSB=true

I think I may have to connect to a battery to complete the circuit