It is possible to get the latest technology in batteries at a discount, if you get creative. Here is a 60,000 watt hour LiIon battery with needed electronics, that just happens to be inside a damaged vehicle. Keep an eye out locally, and you can find a similar one at salvage.
A battery this size will carry a homestead. Most of these batteries are set up in modules that can be taken apart to vary the operating voltage to Match your system's operating voltage.
Image from website:
Only 8500 miles on this battery....
Auction for wreaked electric vehicle:
So If you are in Florida, here is a good option for a power plant storage source. These batteries will last a number of times longer than lead acid batteries.
When looking at Electric Vehicles, the age of the battery is the most important consideration. Research on the modularity should be done before bids are placed on the vehicle. Caution should be used when searching for cars, pay special attention to the damage to be sure that the battery compartment is undamaged.
I wonder if the motor could be used to charge the batteries, since it is part of the purchase already? A chain drive is more efficient than a belt drive, and cheaper than a gear drive system. It is also a top tech item, so this motor could be interesting. The only drawback is that it will take significant power to spin this motor, but the output will be correspondingly high!
I have always wanted to build a heavy steam engine, and this might be a perfect use for this motor. Just keep thinking outside the box.