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In certain systems, the internal charge algorithm is disabled, and the charger is then working with an externally controlled charge
voltage target.
This guide explains the different possibilities:
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 indicated charge state: bulk, absorption, float and-so-forth. (firmware version v1.42 onwards. Earlier versions have a bug
that make the MPPT say “Ext. Control” when it is only being current limited; its internal charge algorithm 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 inver-
ter/charger.
MPPT 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: Bulk when in current controlled mode, Absorption when in voltage controlled mode. Never
Float; even though currents might be low / battery might be full.
MPPT indicated charge state: Ext. control.
8.4. DVCC features for all systems
These features apply to all types of systems when DVCC is enabled: with or without ESS Assistant, and with lead or other normal
batteries as well as when an intelligent CAN-bus BMS connected battery is installed:
8.4.1. Limit charge current
This is a user-configurable maximum charge current setting. It works across the whole system. MPPT Solar Chargers are auto-
matically prioritized over the mains/generator.
This setting is available in the “Settings → “System Setup” menu on the GX device.
Cerbo GX Manual
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