1、 Definition and operational limitations
normal power
Core definition: Can run continuously for more than 12 hours, with no limit on annual running time
Overload capacity: No overload design, long-term load recommendation ≤ 80% rated value
Applicable scenarios: Replace long-term power supply from municipal power (mines, island base stations)
Standby Power
Core definition: Limited to short-term operation during emergency power outages, accumulated ≤ 500 hours per year
Overload capacity: allows for a 10% overload in 1 hour within 12 hours (e.g. a 400kW unit can provide a short-term 440kW)
Applicable scenarios: Emergency backup (sudden power outages in hospitals and data centers)
2、 Numerical relationships and selection traps
Power conversion
Backup power ≈ Common power × 1.1
(Example: Common power 400kW → Backup power 440kW)
Common power ≈ Backup power × 0.8~0.9
(Example: The actual common power of the unit labeled as “standby 400kW” is only 360kW)
Misconceptions in selection
If the standby power unit is mistakenly used as the common power (such as marked as “standby 400kW” but running for a long time at 400kW):
Actual overload of more than 10% leads to shortened lifespan and skyrocketing failure rate
Correct approach: Increase the margin selection by 10% according to the actual load demand (e.g. 360kW load required → select commonly used 400kW unit)
3、 Key precautions
Identification differences
Domestic standard: Commonly labeled power (such as “400kW” for commonly used power)
International standard: often labeled as backup power (need to convert commonly used power by oneself)
Environmental correction
When the altitude is greater than 1000 meters, the power decreases by 4% for every 300 meters increase; When the ambient temperature exceeds 40 ℃, for every 11 ℃ increase, the power will decrease by 2%
Summary and Suggestions
1. Prioritize matching scenarios:
-Long term operation → Select * * common power * * unit (load ≤ 80% rated value)
-Emergency backup → Select * * backup power * * unit (annual operation ≤ 500 hours)
2. Verify parameters:
-Check if the nameplate indicates “PRP” (common power) or “LTP” (standby power)
-Request the manufacturer to provide ISO 8528 power calibration documents
3. Beware of the low price trap: Counterfeit and inferior units often falsely label backup power as high configuration
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