Harbor Freight's 100W Solar Panels can combine up to 400W with connector. Take the output from the connector and feed it into a Solar Charge Controller connected to a 100Ah AGM Deep Discharge battery and you have a fully-functional system that can be fed into an inverter to provide 120V power. The battery type is important and if you are going for a lead/acid kind, due to cost, then make sure it is a Deep-cycle Sealed AGM Battery so that it can be discharged almost to zero and recharged continuously without damage. An alternative, but much more expensive, is a Lithium Iron Phosphate (LiFePO4) battery which will be about 2.5 to 3 times the cost but will be much lighter (24 vs. 60 pounds) and faster charging. Also, make sure that your charge controller supports the LiFePO4 battery type.

Finally, you will also need an inverter and a 12V distribution panel. Also, for safety, make sure everything is fastened down, well fused, and you have spares of all the fuse types.