Not going to happen my friend. Batteries of any kind price is a multiple of the Energy source to make that battery.I've been saying on this forum for years that batteries and solar are on an exponential decline, and that by 2025 solar + batteries will be cheaper than anything else for energy. Probably sooner.
Well as we have all learned and not talked about is even Lithium batteries have a negative EROI meaning it takes more energy to make the battery that it ever provide the user over its life time.
Batteries are just like hydrogen gas. They are energy carries, not fuel sources. That means any energy coming form a carrier is a waste of energy robbing your children's future. and would be better utilized if you just used the fuel that was used to make the carrier. Again hydrogen comes from natural gas and is only 60% efficient. 10 units of energy input, and 6 units out. Leaving you with 4 lost units of energy forever. You are better off and cost less to just burn the natural gas to start with.
More good intentions with unintentional consequences. As of today and I speak professionally. Anything you take off-grid is going to cost you 5 to 10 times more than buying it from the POCO the rest of your life. Not only are you paying more than you have to, but also become a heavy polluter. It took a lot of energy to make those batteries you cannot recover.
Only way to make Hydrogen and Batteries work is using cheap reliable round the clock using nuclear power, followed by hydro. Wind is about break even, and solar is a loss of EROI.