Cerbo GX Manual

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