⚡ UPS Size Calculator
🔌 Professional UPS Sizing Tool — Calculate the correct Uninterruptible Power Supply (UPS) VA rating, estimate battery backup requirements, and visualize load-to-capacity curves. This advanced ups size calculator follows global electrical standards (IEC, NEMA) and includes detailed factor analysis: Power Factor, Safety Margin, Runtime autonomy, and battery bank sizing. Results adapt to USA (120V) and worldwide voltages (230V/240V). Ensure business continuity and equipment protection.
* Battery estimation based on load & typical DC bus voltage.
📘 Factor explainer (worldwide standards)
• Power Factor (PF): ratio of real power (W) to apparent power (VA). Modern IT gear PF >0.9, legacy ~0.6-0.7. Lower PF increases required VA.
• Safety Margin: 20-30% avoids overload and supports start-up surges.
• Runtime (minutes): Backup autonomy. Longer runtime requires larger battery banks.
• Battery Voltage (auto): derived from UPS VA (12V/24V/48V typical for global UPS).
• USA & World: Output voltage 120V (NA) / 230V (EU/AS/AU). Sizing principles identical.
• Power Factor (PF): ratio of real power (W) to apparent power (VA). Modern IT gear PF >0.9, legacy ~0.6-0.7. Lower PF increases required VA.
• Safety Margin: 20-30% avoids overload and supports start-up surges.
• Runtime (minutes): Backup autonomy. Longer runtime requires larger battery banks.
• Battery Voltage (auto): derived from UPS VA (12V/24V/48V typical for global UPS).
• USA & World: Output voltage 120V (NA) / 230V (EU/AS/AU). Sizing principles identical.
📊 RECOMMENDED UPS VA RATING
— VA
➡️ Nearest commercial size: –
🔋 BATTERY BANK (for selected runtime)
— Ah
System voltage: — VDC | Depth of discharge + efficiency factored
⚡ LOAD & SYSTEM SUMMARY
✅ Real Power: 0 W | Apparent Power: 0 VA
🌍 Global compatibility: 50/60Hz auto-sensing | US (120V) / 230V Intl.
🔁 Safety Margin used: 0% | Power Factor: 0.00
🌍 Global compatibility: 50/60Hz auto-sensing | US (120V) / 230V Intl.
🔁 Safety Margin used: 0% | Power Factor: 0.00
📈 UPS Capacity Curve (Required VA vs Load) — based on current PF & Margin
X-axis: Connected Load (Watts) | Y-axis: Required UPS VA rating (with current PF + safety margin)
🔌 USA / NEMA
120V, 60Hz
Use 125% NEC derating recommendation.
120V, 60Hz
Use 125% NEC derating recommendation.
🌍 Europe / IEC
230V, 50Hz
Same VA rating works globally.
230V, 50Hz
Same VA rating works globally.
📐 Power Factor impact
PF 0.6 → 1.66x VA vs Watts
PF 0.95 → ~1.05x VA
PF 0.6 → 1.66x VA vs Watts
PF 0.95 → ~1.05x VA
⏱️ Runtime factor
Typical internal UPS batteries: 5-15min. Extended battery modules needed for >30min.
Typical internal UPS batteries: 5-15min. Extended battery modules needed for >30min.