Solar Power For Home

what does is mean when it is stated that a solar panel had 80 watts in it? does it mean it can only hold 80 watts of power at a time? if it does, is that what you attach a battery to it? does it only collect 80 watts of power and then you throw it away? i live in a home that uses about $15,000 worth of electricity per year. how many solar panels or how huge an area of panels will i need to obtain FREE energy?

thank you so much. I am just curious and to have a community willing to help me out is a gift. THX again,
God bless!!

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