means you are on your own: there is no connection to the power company. The only way to accomplish this in a setting where you want electricity even when the sun is not shining, is to incorporate batteries into your system. Thus off-grid homes have no power poles running to them, and draw the power they need from deep cycle battery banks.
the Alternative “Grid-tied,” by contrast, means that your house is connected to the grid, and you are still set up to buy your power from the power company when you need it But, when your solar array is producing power, you can either sell that power straight to the grid with the goal of financially offsetting the cost of the power you have purchased, or you use that power yourself first, and sell any extra to the grid. You may not be using the actual electrons you have produced yourself, but you are still contributing green power to everyone’s benefit.