I'm not sure I follow your reasoning. For most everything else, the economies of scale help. A larger business with larger needs would need a larger investment but $ / KWH should decrease as the size went up. As it now stands, the federal tax credit is unlimited and on top of that, a guy should be able to write off the farm portion of the installation. If it works for a home with no deduction allowance, why wouldn't it work for a bigger install with the added tax benefits?