When seconds matter, your UPS and generator must work together seamlessly. Here is how to design for it.
## The Integration Architecture
1. **UPS as first line** – Handles immediate transfer
2. **Generator as second line** – Takes load after UPS battery threshold
## Typical Transfer Sequence
1. Utility power fails
2. UPS transfers to battery (0 ms)
3. Generator starts (5-15 seconds)
4. Generator stabilizes (30-60 seconds)
5. ATS transfers load to generator
6. When utility restores, reverse sequence
## Key Design Considerations
### Generator Sizing
– Must handle full load + 30% growth
– Account for harmonic loads
– Consider starting current of large motors
### ATS (Automatic Transfer Switch)
– Critical component – often overlooked
– Choose delay settings carefully
– Test regularly
### Fuel Supply
– On-site fuel storage requirements
– Refueling schedules
– Emergency fuel contracts
## Common Mistakes
– Undersizing generator
– No load bank testing
– Ignoring harmonic distortion
– Poor ATS maintenance
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