In summary, the DC back-up power products and systems offered by PULS provide safe and reliable methods to prevent system downtime, the loss of data, and/or long restart sequences. There are three typical methods of providing DC back-up power: buffer modules with electrolytic capacitors, DC-UPS systems with super caps, and DC-UPS systems with batteries. The duration of the back-up time is determined by the size of the load and the number of buffer units or the size of the battery used to store energy. Each method has many advantages and some limitations, and PULS provides detailed documentation to assist users in selecting the best solution for individual application conditions and requirements. All PULS buffer modules and DC-UPS systems are available from DigiKey.