Batteries can be charged and monitored directly in the RTU for easy and timely maintenance. Backup is integrated on the cards for AC power (12 V or 24 V batteries). For DC systems, we offer separate backup cards for 24 V and 48 V. The cards include connectors for lead acid battery, temperature sensor and ON REL – Life contact. Small systems in a 3-slot chassis have an optional battery charger integrated on the bus together with the power supply.