My new boat has an ultrasonic antifouling system, no idea if it works but am curious to use it long enough to form my own opinion. It currently is wired to run off the batteries which are connected to a charger running off 240v shore power, if the shore power is disconnected for any reason it flattens the battery fairly quickly. I was wondering if a better option would be to buy a 240v to 12v trasformer and run the unit directly from that as it's only used when the boat is in the marina. Any reasons for or against?