Bill Arden
Computer Programmer
I've pushed 12V car alternators up to 48 volts by removing the core regulator and driving it externally, but that is not something I would rely on.
From a technology point of view, it's easier (probably cheaper when using surplus) to use a rotary converter for large motor starting. The rotary converter also gives you sine wave three phase power.
The variable speed alternator/inverter approach is probably the most efficient when you are operating at low loads most of the time.
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Some other batteries to think about.
http://en.wikipedia.org/wiki/Vanadium_redox_battery
http://en.wikipedia.org/wiki/Nickel-iron_battery
From a technology point of view, it's easier (probably cheaper when using surplus) to use a rotary converter for large motor starting. The rotary converter also gives you sine wave three phase power.
The variable speed alternator/inverter approach is probably the most efficient when you are operating at low loads most of the time.
--
Some other batteries to think about.
http://en.wikipedia.org/wiki/Vanadium_redox_battery
http://en.wikipedia.org/wiki/Nickel-iron_battery