As they are designed and manufactured for critical and emergency situations, they must be robust and highly reliable, and remain correctly maintained through very rigurous protocols. They’re not used frequently, but when they’re needed, they cannot fail.
Autonomy is also important. These gensets must be able to supply electric power during extended periods of time, and even receive fuel safely during their operation.
They’re units which typically have to be adapted to an installation area indoors, which forces us to comply with limits in volume, weight, thermal and acoustic emissions, vibrations, etc. which must all be duly managed.