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The 'Automatic' function uses the following logic:
1. When available, it will use a dedicated battery monitor, such as the BMV, SmartShunt, Lynx Smart BMS or a Lynx Shunt
VE.Can, or a battery with built-in battery monitor.
2. When there is more than one of those connected, it will use a random one - although you can select one manually.
3. When there is no dedicated battery monitor, it will use the VE.Bus SoC.
When should I use the 'No battery monitor' option?:
Use that in systems where:
1. there is a Multi or Quattro installed
2. no BMV or other battery monitor is installed
3. the system has other DC loads or other chargers connected to the same battery, which are not connected to the Cerbo GX.
A short explanation: The VE.Bus SoC determined by the Multi or Quattro is incorrect in the above situation as it does not take into
account the discharge and charge currents by those other DC loads and also unmonitored chargers.
8.2.5. Details on VE.Bus SOC
• While the Inverter/Charger is in bulk, the SoC will not rise above the value as set in VEConfigure for the 'State of charge
when Bulk finished' parameter on the General tab; default 85%. In a system with solar chargers, make sure that the absorption
voltage as configured in the MPPT is slightly above the same setting in the inverter/charger. The latter needs to recognise that
the battery voltage has reached the absorption level. If it doesn't, the SoC will be stuck at the earlier mentioned End-of-bulk
percentage, default 85%.
8.2.6. The System Status menu
The System Status menu (Settings → System setup → System Status) contains diagnostic flags that can be useful in diagnosing
problems with the system. Note that nothing can be configured here. The on/off flag depends on how a system is set up and what
devices it contains.
Their meaning in detail are:
1. Synchronise VE.Bus SoC with battery:
• If On, it indicates that the activated battery monitor in the Multi/Quattro is synchronising its SoC with that of a better source
(a BMV or BMS in the system). The system does that automatically.
2. Use solar charger current to improve VE.Bus SoC:
• In a VE.Bus system with no other battery monitor (no BMS, no SmartShunt, no managed battery) but with solar chargers,
the solar charge current is taken into account and helps improve the SoC calculation of the internal Multi/Quattro battery
monitor. The system does this automatically and indicates that it is active by displaying On.
3. Solar charger voltage control:
• If on, this indicates that the solar chargers are not following their own internal charge algorithm. They're getting a voltage
setpoint from somewhere else. Either
• a managed battery or
• in an ESS system, they get it from the Multi/Quattro.
4. Solar charger current control:
• This indicates that the solar chargers are current limited by the system. In most cases the limiting device is a managed
battery or a user-defined Maximum charge current in the DVCC menu.
Page 58
Cerbo GX Manual
Configuration
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