With high efficiency, portability, low noise and excellent cost as its core advantages, high-frequency online UPS is the mainstream choice for scenes such as IT, office, finance, medical care and marginal computer rooms. The following selection recommendations and core points are given according to typical scenarios.
First, the selection of core principles (first clear)
Power matching: according to the total load power (kW)+20%–30% redundancy selection; The power factor of high frequency machine is usually 0.9–1.0, 10kVA ≈ 9–10kW.
Topology priority: double transform high frequency online (VFI) is preferred, switching time is 0ms, and pure sine wave is output.
Input adaptation: wide voltage (single input and single output: 110–300 V; Triple: 138-485V), high PF(≥0.99) and low THDi.
Efficiency and heat dissipation: inverter efficiency ≥94% and ECO mode ≥ 95%; Noise < ＜60dB is more suitable for indoor use.
Battery and time delay: Lead-acid/lithium battery should be equipped as required, and the battery pack should be enlarged and the charging capacity should be matched for long time delay.
Second, the typical scene selection recommendation (by power/topology)
1. Small office/outlet/edge scene (1–10kVA, single entry and single exit)
Application: office, finance room, cashier in store, ATM, small server, network cabinet, medical light load (B-ultrasound, monitor).
Recommended model:
1–3kVA: Costar YDC9101/9103, Huawei UPS2000-G-1K/3K and Mercer EH5500 series.
6–10kVA: Costar YDC9110, Huawei UPS2000-G-10K and Mercer EH5500 series.
Core advantages: small size, low noise, convenient installation and high cost performance; Support generator access.
2. Medium-sized computer room/industrial/medical department (10–20kVA, three in and one out)
Application: medium-sized server cluster, PLC industrial control, precision detection, operating room/ICU, commercial complex, financial outlets.
Recommended models: Costar YDC9310/9320, Huawei UPS5000-A-10K/20K and Mercer EH5000 series.
Core advantages: wide input (208-478V), resistance to power grid fluctuation, adaptability to industrial environment and support for parallel operation.
3. Medium and large data center/financial core (20–20-200kVA, three in and three out)
Application: IDC, cloud computing node, computer room of financial head office, industrial production line, rail transit, large medical imaging (CT/MRI).
Recommended models: Costar YDC3320-33200, Huawei UPS 5000-A-40K–200K and Mercer EH9335 series.
Core advantages: ultra-wide input (138–485 V), dual input redundancy, 2N/parallel operation support, high reliability and intelligent management.
4. Large IDC/Cloud Center (100–1000 KVA, modular high frequency)
Application: super-large data center, multi-cabinet centralized power supply, phased expansion project.
Recommended models: Costar YMK3300 and Huawei UPS5000-S modular series.
Core advantages: N+X redundancy, hot plug and expansion, efficiency ≥96.5%, intelligent sleep and optimal TCO.
Third, the scene special considerations
Office/Finance: Give priority to low noise (< ＜55dB) and small size, with a delay of 10–30 minutes.
Finance/ATM: zero interruption and high stability are emphasized, and N+1 redundancy is recommended.
Medical equipment: high frequency for light load; The operating room/imaging department suggests high frequency+medical isolation transformer to strictly control the zero ground voltage.
Industrial automation: If impact load such as motor/frequency converter is included, high-frequency machine+external isolation transformer is preferred, or industrial-grade high-frequency model is selected.
Old buildings/power grid difference: choose ultra-wide input and high anti-interference models, and add isolation transformers if necessary.
Fourth, the selection of quick look-up table (quick matching)
form
Core points of scene power range topology recommendation series
Small office/outlet 1–10kVA single input single output YDC9100 and UPS 2000-G are low noise, portable and cost-effective.
Medium-sized computer room/industrial control 10–20kVA YDC9300 and UPS 5000-A with wide voltage, anti-fluctuation and industrial adaptation.
The medium and large IDC/Finance 20– 20-200kVA, YDC3300 and UPS 5000-A are double redundant, parallel and highly reliable.
100–1000 kva modular YMK3300, UPS 5000-S hot plug, N+X, efficient capacity expansion in large cloud centers.
V. Selection of pit avoidance
Do not blindly choose high power, match according to actual load+redundancy, and avoid waste.
Distinguish the apparent power (kVA) from the effective power (kW), and the high frequency machine pf ≈ 0.9–1.0.
Confirm that it is pure online double conversion to avoid the switching delay of "quasi-online" models.
For industrial/shock load scenarios, ordinary high-frequency machines should be used cautiously, and high-frequency+isolation transformers or industrial-grade models are recommended.
