Just a few notes on automotive alternators.
They can be easily configured to put out any voltage from 12 to 240 volts. This is simply done by bypassing the regulator, either internally or externally depending on the make. Once 12 volts is fed to the field windings the voltage output is speed regulated.
The brushes in these units carry only the small field current and sparks and wear are of little concern.
As to live frames, automotive alternators produce three phase AC which is then rectified into DC. By removing the internal rectifiers you delete the negative connection to their frame. The rectifiers can be setup externally so as to avoid the connection.
For 48 volt charging there is no need for multiple units, just a single unit with the appropriate regulator.
Newer units are small and efficient although they will not stand up to continues heavy use. Alternatives are available in either older more robust designs, or newer specialty items. Check into the aftermarket car modification market for some really heavy duty units.
All of this being said, I believe there are far better choices out there and there is no need to reinvent the wheel.
--- In electricboats@yahoogroups.com, John Green <v_2jgree@...> wrote:
>
> By insulating the bolts holding the mounting brackets, the series could
> be achieved.
SNIP
mattelderca
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