You probably don't have enough space then. In most locations and for most homes or businesses, you can easily replace over 80% of your grid power. You could e

You probably don't have enough space then. In most locations and for most homes or businesses, you can easily replace over 80% of your grid power. You could even replace 100% but the risk there is that most utilities have "no negative net metering" regulations approved by the local PUC that mean if you produce more than 100% of what you use, the utility keeps it for free. This makes installing a system at close to the limit uneconomic (and is also one of the reasons that Germany has more installed solar per capita despite far less favorable solar radiation than the US).