Found this interesting article (entitled Minimizing UPS and Gen-Set Incompatibility) explaining about compatibility issues with UPS and gensets, primarily due to:
- Failure of the UPS to acquire and accept power from the gen-set,
- Instability of the gen-set frequency or voltage when powering the UPS,
- Inability of the UPS to synchronize its output to the gen-set,
- Inability to enable the operation of the maintenance bypass circuit,
- Excessive output voltage distortion, and
- Power transfer issues.
