Parallel standby power systems have always been significantly advantageous over single large generator units. However, implementation of such systems has historically been limited to large projects or mission critical applications due to the constraints of higher cost, space, and the high level of complexity involved to setup and maintain. Until recently, many businesses both large and small have refrained from parallel operation of generator sets. With the introduction of sophisticated integrated digital control technologies, it has now become much easier to operate systems in parallel and benefit from the additional advantages these systems can provide. Please read Tips on Buying Used Generators for further information regarding pre-owned gensets that you may be considering to operate parallel. (1) Reliability The redundancy inherent in parallel operation of multiple generators provides greater reliability than is offered by single generator unit for critical loads. If one unit fails, the critical loads are redistributed among other units in the system on a priority basis. In many environments, the critical loads that need the highest degree of reliable backup power usually account for only a fraction of the overall power generated by the system. In a parallel system, this means that the most critical elements will have the redundancy necessary to maintain power even if one of the units goes out. (2) Expandability When sizing generators to match you load requirements, it is often difficult to accurately project increases in load and adequately plan for anticipated additional requirements. If load projections are aggressive, your initial investment in a generator may be higher than necessary. On the other hand, if load projections are inadequate, you may be left without reliable standby power or may have to resort to expensive generator upgrades, or even purchasing another unit altogether. By operating systems in parallel, it is easier to allow for variations in load without overrunning your budget or piling up expensive units that rarely get used. As long as you have enough physical space, generators can be added for additional power supply when required. Similarly, redundant generators can be detached from the unit and can be used separately at other sites. (3) Flexibility Using multiple units in parallel offers greater flexibility than using a single large-sized generator of a high capacity. Multiple smaller generators operating in parallel do not need to be grouped together and can be located in a distributed fashion lessening the need for one very large footprint for a single, larger generator. Rooftop installations or setting up small-sized generators in limited areas are just a few ways you can creatively find ways to make them fit. Since the units do not require a collective large space that have to be side by side, these can often be installed in small facilities or whenever space is a restricting factor. (4) Ease of maintenance and serviceability If a generator in the system breaks down or requires maintenance, individual units can be dismantled and serviced without disrupting the functioning of other units. The redundancy inherent in a parallel system provides multiple layers of protection and ensures an uninterrupted supply of power for critical circuits. (5) Cost-effectiveness and Quality Performance Individual units operating in parallel are typically of smaller capacities. The engines used in these generators are usually industrial, on-road or high-volume engines designed with advanced manufacturing technology that gives them a high degree of reliability and low cost of generation per unit of power.