11.3. DVCC effects on the charge algorithm
In standalone mode, our inverter/chargers and MPPT solar chargers use their own internal charging algorithm. This means that
they determine how long to remain in Absorption, when to switch to Float, when to switch back to Bulk, or Storage. And in those
various phases they use the configured parameters in VictronConnect and VEConfigure.
In ESS systems and systems with managed battery (see the Battery Compatibility manual), the internal charge algorithm is
deactivated and the charger then works with an externally controlled charge voltage setpoint. This table explains the different
possibilities:
Selection guide Resulting charge algorithm
System type Battery type DVCC Inverter/charger Solar charger
ESS Assistant
1)
Intelligent battery
On Battery Battery
Off Don't do this; better enable DVCC
Normal battery
On Internal Inverter/charger
Off Internal Inverter/charger
Standard
Intelligent battery
On Battery Battery
Off Don't do this; better enable DVCC
Normal battery
On Internal Internal
Off Internal Internal
1)
The ESS Assistant is only installed in a specific type of power system that integrates a grid connection with a Victron
inverter/charger, GX device and battery system, not to be confused with an off-grid system such as is used in boats or RVs.
Details
• Internal
• The internal charge algorithm (bulk → absorption → float → re-bulk), and the configured charge voltages are active.
• Inverter/charger indicated charge state: bulk, absorption, float, and-so-forth.
• MPPT solar charger indicated charge state: bulk, absorption, float and-so-forth (firmware version v1.42 onwards. Earlier
versions have a bug that make the MPPT solar charger say “Ext. Control” when it is only being current limited; its internal
charge algorithm is still active.).
• Inverter/charger (applies to MPPTs only)
• The MPPTs internal charge algorithm is disabled; instead it's being controlled by a charge voltage setpoint coming from the
inverter/charger.
• MPPT solar charger indicated charge state: Ext. control.
• Battery
• The internal charge algorithm is disabled and instead, the device is being controlled by the battery.
• Inverter/charger indicated charge state: Ext. control.
• MPPT solar charger indicated charge state: Ext. control (the LEDs continue to show bulk and absorption, never float).
11.3.1. DVCC effects when there is more than one Multi/Quattro connected
Only the Multi/Quattro (which can be a single device, or multiple together configured for three-/split-phase as well as parallel)
connected to the VE.Bus port will be controlled via DVCC. Additional systems, connected to the GX device using an MK3-USB,
are not controlled by DVCC and will charge and discharge according to the configuration made in those units.
This applies to all types of systems with DVCC enabled. For example a system that does not include a managed (CAN-Bus)
battery, and uses only the DVCC charge current limit: that charge current limit is only applied to the Multi or Quattro connected to
the VE.Bus port.
Color Control GX Manual
Page 60
DVCC - Distributed Voltage and Current
Control
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