This idiot keeps saying all you need to do is keep the batteries charged.

If you are discharging the batteries at a rate of 60kW, the batteries have to be charged by at least 60kW. Yes, I agree if you have a 60kW generator like this one http://www.generac.com/Industrial/products/diesel-generators/configured/60kw-diesel-generator and hook some batteries up to it, you can put out 60kW of electricity. According to this article: https://www.ablesales.com.au/blog/diesel-generator-fuel-consumption-chart-in-litres.html a 60kW generator will require 4.25 gallons of Diesel per hour. Diesel is generally $3/gal, so you're looking at $13/hr in Diesel.

That gives you 21 cents per kWh. That's well more expensive than grid electricity. Any electricity you're not inputting from a generator, you're inputting from the grid. There is no configuation of battery/generator/grid/converter/alternator/whatever that gets around this middle school fact. Seriously, you're talking to people with science degrees with absolutely no knowledge of what you're saying. If you're happy paying a diesel bill rather than an electric bill, good for you. But it's not cheaper, so just fucking stop.