I have a 105year old 5 ton electric truck sitting in my shop that belongs to my partner. 6 of the 9 Edison batteries will still take and hold a charge.
As far as 3 phase power goes for years there have 3ph DC to AC converters at the commercial scale. While I was in Kuwait the company I was with was contracted to provide a pir of 750 KW diesel backup generators, the switch gear, the battery bank and the UPS to insure a 100% clean uninterrupted 50hz 415VAC power to a research lab in the American University of Kuwait. Our factory was powered by diesel generators as at our location no electric service of sufficient size was available to us my office ran 24/7 on battery power charged during the day by our 500KW generator 14 computers and associated equipment stayed on day and night even during the hours the generator was shut down. it would not have been too much of a stretch to add solar, had we had enough surface area for such an array
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