With respect to the cost of installation, which is currently prohibitive...
What we'll see in the future are business models not centered around the customer paying the 10's of thousands to install up front. It will be a financing based industry. So long as the cost to service that debt is less than what your electricity would have cost off the grid, you come out ahead. Think mortgaging a house to rent it out. Except instead of incurred rental income, its avoided electricity costs.
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