> How would I go about wiring it directly from a 12V battery
> that is part of a 48V system?
Just connect to +/- terminals ..... BUT
this is a poor approach because it will unbalance the battery bank.
The better solution is either of
1) use a DC-DC step down converter like these:
http://www.thunderstruck-ev.com/index.php?dispatch=categories.view&category_id=40
2) add a dedicated 12v battery just for the bildge pump.
--Tim.
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