Marti: Personally I'd go with the dedicated battery to the bilge pump perhaps with a 5 watt solar panel to keep it topped up. Anytime you convert voltages up or down you will be have some electronics somewhere creating heat and a current draw and if you connect the bilge pump up to a converter off of the 48 volt bank that converter draw will be a constant drain on your battery bank. You may find your bank drained a lot more than you planned on. That is unless you plan to ALWAYS keep your 48 volt charger plugged in when you are at the dock. Then you might be able to do it without a second battery. But, you will drain down the 48 bank more as a soon as you leave the dock than having a seperate battery for the bilge pump. There is a way it could work. You might be able to run the power for the converter through the float switch for the bilge pump. So that when the float switch closes it provides power to the converter which is hard wired to the bilge pump. That way the converter is not draining the 48 volt bank unless the bilge pump is in operation. But, you must make sure the float switch can handle the current of the bilge pump and the 48 v to 12v converter. Capt. Mike --- On Sat, 2/12/11, MartiT <mthorkilson@yahoo.com> wrote:
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