My 50 watts at 18v solar panel and 100amp battery at standard use 13.5-13.8 can this two work?

There is voltage output supply from the solar panel, there is out put supply voltage from the battery but it is not powering up the socket outlet connected to it. can the problem be the controller.My 50 watts at 18v solar panel and 100amp battery at standard use 13.5-13.8 can this two work?
You've only listed three components and


proved that two are nominal.


(I assume the ';controller'; is an inverter/charger unit,


and that the 13.8 V. indicates the battery is fully charged.)


It's either your connections or the ';controller';.


Before you panic, re-read the manual and check


all your connections and control settings.