Absolutely yes. Most marinas will have 240V power available which will enable you to charge your batteries. In fact, it is important that you charge your batteries in this way regularly so that your shunt (more about this later) is recalibrated.  Victron, manufacturer of shunts, recommends that this is done every two weeks to maintain accuracy of the reading. There are also some public charging points available on the waterway but they are not as common as we’d hope and until this time we recommend that you have a generator.