The advantages of a parallel-redundant UPS system are that if offers a far higher level of availability than parallel-capacity systems due to the extra capacity within each UPS module. This can be utilised if one breaks down or has to be taken out of service for maintenance The system is also less likely to fail than other parallel configurations because there are fewer breakers and no step loads (modules are online the whole time). It is also expandable should the power requirement grow and the hardware arrangement is simple and cost-effective.