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The Victron Energy Autotransformer is the one item we sell that causes the most confusion. Read about how it gets used in a US 120/240 volt system here

Camper van and RV electrical systems comprise charging from the engine, shore power and solar panels. From these sources we can charge batteries or power AC and DC systems directly allowing for extended time off grid and away from shore power.

Arguably, there is no more worthwhile electrical project you can undertake on your boat to improve comfort and convenience than the installation of a high power alternator.  Having a high power alternator will provide you with a substantial improvement in the availability of electrical power on board. 

Amp hour meters do a great job at assisting the boat owner with battery management.  They provide an accurate reading of voltage and of amps going in and out of the batteries and by keeping track of these readings over time they can provide a reading of "amp hours" or the state of charge of the battery as a percentage.  They also often maintain a record of historical data and can use that to figure out battery efficiency.

For most people to answer to this is "as big as possible".  Charlie Wing's book the "Boatowners Illustrated handbook of Wiring"  has a very good explanation of how to calculate the capacity you need. The calculations start by working out what your daily load will be both at anchor and while underway.

Victron Energy offers a suite of equipment for use with their own brand of Lithium Ion batteries. Can that same equipment be used with other brands of batteries? See here what works and what doesnt.......