Victron energy Venus GX Manual page 17

Automatic Generator start/stop
1. Which relay and control to use?
Various Victron products have functions to automatically signal when to start and stop a generator.
Here is advice on when to use which product and method.
Option 1: GX device like CCGX or Venus GX
When there is a GX device (CCGX, Venus GX, or other) in the system, the best option is to use its
Generator Start Stop mechanism. Its the most feature-rich generator start/stop system that we have
to offer. It provides for basic functions as starting and stopping on Battery State of Charge, Battery
voltage as well as High load situations. And also has many advanced features, including automatic
test runs and silent times.
Option 2: BMV Battery Monitor
The next most used option is a BMV-700 Battery Monitor or similar model. It can start the generator
on low battery voltage and/or low battery state of charge. See the BMV-700 manual for configuration.
Option 3: Using the relay in the Multis or Quattros
The Multis, MultiPlus-IIs, Quattros, EasySolars and the rest of the VE.Bus family also have Generator
start/stop feature with a relay. There are two different ways to configure them:
1. Generator Start/stop function of the Virtual Switch (recommended)
2. Generator start/stop Assistant (more advanced / complex)
Combining the options
Lastly, its of course also possible to combine above mentioned methods, by wiring the open contacts
in parallel to each other, or in series, to the Generator.
2. How to wire generators with a three-wire interface
All above Victron products and devices have a single relay; which will close when the generator needs
to starts; and then expect the generator to then keep running until the relay is opened again. Or the
other way around.
When having a generator that requires a start pulse and a stop pulse, such as for example
Cummins/Onan generators; additional wiring is required.
Automatic Generator start/stop