Back-up battery (optional)

The back-up battery is an optional component of the system.

The expanders included in the EXP2D and EXP4D control units incorporate a battery charging circuit that can supply a current of 0.3 A or 0.6 A, until the supply voltage provided to the expander (13.8 Vdc nominal) is reached. The charging current is selected using configuration jumpers.

Deep-discharge protection

To preserve the battery’s service life, the expander continuously monitors its voltage:

• When the battery voltage drops below approximately 10 Vdc, it is automatically disconnected from the expander.
• The battery is automatically reconnected once the main power supply of 13.8 Vdc is restored.

Recommended charging current settings

To comply with the requirement of the EN 60839 standard, which stipulates that at least 80 per cent of the battery’s capacity must be recovered within a maximum of 24 hours, it is recommended to set the charging current according to the capacity of the installed battery:

• 0.3 A for 7 Ah batteries.
• 0.6 A for 17 Ah batteries.

Important: Selecting the correct charging current ensures the battery is recharged properly and that the recovery times required by the standard are met.

These power stations support 12 Vdc batteries ranging from 7 to 17 Ah.

These units support 12 V DC batteries ranging from 7 to 17 Ah.