If it costs you more than $40,000 to get power connected to your house, then it may be a good idea to consider going off-grid completely. You need to have gas water, gas heating and gas cooking and you need to be willing to live a simple electrical life. No spa pools, electric blankets etc., unless you want to pay big dollars for it (think $100,000).
If you are already connected to the grid, then there is absolutely no return on your investment to go off grid.
You need to be willing to spend around $30-$50,000 to go off grid and live a simple electronic life. We only use high quality inverters and lithium ion batteries and are not willing to supply any other cheaper brands.