Setting up parallel and split phase systems using the Victron MultiPlus and Quattro inverter chargers

This article is about setting up parallel or split phase systems using the MultiPlus or Quattro inverter chargers. A parallel configuration means you are using more than one MultiPlus or Quattro to increase the total power available.  A split phase system means you are putting two identical units beside each other to work in 180 degree opposite phases; two 120 volt units can make 240 volts total and the result is a 120/240 volt system. Before you get too far along building a split phase system you might like to consider another option using an Autotransformer instead. That option is covered in my blog post: Generating a 120/240 Volt split phase power supply from an inverter 

To work together the units must be connected together with VE Bus cables.  Because this is such a critical connection its best to use Victron Cables for this, my Blog Post Please use Victron VE Bus cables to hook up VE Bus equipment explains why.  To do the programming setup requires a PC and the Mk3 USB Interface     We will be using two programs to set up the system, both can be downloaded for free from the Victron website as part of a suite of tools known as the VE Configuration ToolsThe first program, VEConfig, is used to program each unit individually for all charger settings including battery type, charge voltage and current, and any appropriate inverter settings such as low voltage shutdown, output voltage and frequency etc.   The settings for each unit must be identical.  Full details on how to do this are contained in my three part Blog Post Programming your Victron MultiPlus or Quattro with the VE Configure program  There is even a Victron Video that takes you through the steps. A screenshot from the program is shown below.