The supply of uninterruptible power can be applied to many areas where continuous operation is highly prioritized. The application of uninterruptible power for motor operation is facilitated using a frequency converter. Direct current operated frequency converters can be applied directly to the power reserve which removes the need for additional power-converting. Batteries have long constituted the power reserve but advancements in the development of ultracapacitors have created a viable substitution. Ultra-capacitors have high energy storing capabilities and can be applied to high power applications. Maxwell is a leading manufacturing company of ultracapacitors and pro-vide different modules with built-in solutions for voltage balancing. Uneven voltages between series-connected capacitors is a phenomenon caused by vary-ing capacitance. A configuration containing Maxwell’s 56V module is created and constitutes the power reserve in the simulations. The discharge simulation shows a significant current that could damage the system. A current limiting transistor is introduced in the circuit to provide a safer course of discharge. The result of the simulations confirms that the application of ultracapacitors in uninterruptible power for motor operation is viable.