Assuming 8 hours of sunlight per day will produce (300W X 8 hrs) 2400 wh per day and its about 2400 Wh X 365 = 870 kwh per year. If all of your appliances added up on constant use is under 870 kwh, then it's doable. However, if an piece of appliance runs at 3700 Wh per day like a. Depend on the amount of power you need for your particular solar system project. Sometimes you need more wattage to supply power to your system. You can either get a big panel or multiple smaller. If the solar panel brand and design are the same, there is not much differences besides the wattage based on flash tests done at the factory. This goes back to the number of cells inside the panel during. A 72 cell has more photovoltaic cells and higher wattage, thus it has a higher efficiency and larger in size than a 60 cell solar panel. How much bigger ? A 60 cell - 3.25ft X 5.5ft A 72-cell panel has 5.4ft X 3.25ft Overall, 60 cell panel is more common for residential solar panel installation. 72 cell panel is for large scale solar system project. Monocrystalline is the most efficient (Up to 15 - 25% efficiency rating) It's rigid for durable use on RV and small home projects. Thin film (Amorphous) is recommended for flexible solar panels on curved surfaces. Learn more about their differences here.