Uninterruptible power supply controller (DC-UPS) is used in addition with a 24V power supply and batteries to bridge power failures or voltage fluctuations. No change in output voltage in battery mode selectable output voltages in battery mode 1-Battery-Concept each 12V battery is charged and monitored separately for longest battery life Precise battery charging by using a temperature sensor Battery size selector for small or large batteries 50% BonusPower, 30A for up to 4s High breaking capacity for branch protectors Smart battery diagnostics and monitoring functions ApprovalsUL cULus CE CSA This listing is for Each.