Your Solar Panels produce Direct Current electricity. This is the same sort of electricity that is stored in your car battery. Unfortunately, the appliances in your home mostly run on Alternating Current. For many applications, DC is superior to AC, many of your appliances, like your TV, computers, and your cell phone chargers all convert your household AC to DC to operate.
Your appliances use AC because it is easier to send AC over transmission wires. It is simpler to convert the DC from your Solar Panels to AC than it is to replace all your appliances.