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iub - inventlab ultracapacitor buffer module - is a Supercapacitor/Ultracapacitor based 12 V Buffer module with an input voltage range of 3.6 to 36 VDC. buffer When the input voltage is higher than the Supercapacitor voltage, the output current is drawn from the input voltage. When the input voltage falls below the Supercapacitor voltage (max. 12.5 V), the current is drawn from the Supercapacitors. The capacity is extendable and several iubs can be used in parallel.