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kWh to mAh for Battery Backup Systems

1. Introduction: Why kWh→mAh Matters for UPS & Battery Backup

In UPS design, energy is often rated in kWh (kilowatt-hours), while batteries are specified in mAh (milliamp-hours).
Converting between these units enables engineers and SEO-savvy buyers to match UPS power supply needs accurately.

kWh to mAh

2. Key Concepts & Units

  • kWh = energy (1 kWh = 1,000 Wh)
  • Wh = energy delivered at 1 watt for 1 hour
  • Ah = charge; current × time in amp-hours
  • mAh = Ah × 1,000; common in battery specs

3. Conversion Formulas

A. Wh → mAh

(e.g., 100 Wh ÷ 5 V = 20,000 mAh)

B. kWh → mAh

(e.g., 1 kWh ÷ 12 V × 1,000,000 = 83,333 mAh)

C. Reverse: mAh → Wh/kWh

(e.g., 10,000 mAh @ 3.7 V → 37 Wh)

4. Examples & Table

ScenarioFormulaResult
1 kWh @ 12 V10³ ÷ 12 × 10⁶83,333 mAh
100 Wh @ 5 V1,000 × 100 ÷ 520,000 mAh
10,000 mAh @ 3.7 V10,000 × 3.7 ÷ 1,000 = 37 Wh0.037 kWh

5. Why It Matters for UPS & Battery Backup Systems

  • Sizing UPS battery backup: Estimate runtime under load (kW → kWh, then to mAh)
  • Selecting battery packs: Match battery specs (mAh) to UPS energy needs (kWh)
  • SEO context: Guides on “energy conversion formula” and “power capacity calculator” help BKPOWER’s authority

6. BKPOWER’s System Applications

  1. Home / Small Office UPS
    • 0.5 kWh UPS → ~41,667 mAh @ 12 V → supports ~300 W load for ~1.5 hours.
  2. Data Center UPS Module
    • 5 kWh system → ~416,667 mAh @ 12 V or ~83,333 mAh @ 48 V
    • Use with BKPOWER’s battery backup solutions for long runtimes.
  3. Battery Bank Sizing for Solar Storage
    • 10 kWh solar energy → ~208,333 mAh @ 48 V
    • Integration with BKPOWER UPS power supply and inverters.

7. Benefits & Limitations

Pros

  • Precise battery dimensioning
  • Simplified procurement process
  • Clear UPS support documentation

Cons

  • Real-world discharge varies with battery efficiency
  • Voltage changes over time—use nominal V carefully

8. Tips for Accurate Conversion

  • Use nominal voltage consistently
  • Allow 10–20 % safety margin in capacity
  • Account for Peukert’s law, temperature effects
  • Recalculate after module expansion

9. Call-to-Action: BKPOWER Solutions

BKPOWER offers professional UPS system and battery backup products with:

  • Clear kWh & mAh specs
  • Smart monitoring (SNMP/RS485/Web)
  • Modular design, easy expansion
  • Full UPS support: sizing, installation, maintenance

👉 Contact BKPOWER for custom energy conversion guidance and optimized UPS sizing.

BK-G33-200KVA-Industrial Power Frequency UPS

References

  1. ​International Electrotechnical Commission (IEC)​​​​Official website: www.iec.ch
  2. ​Underwriters Laboratories (UL)​​​​Official website: www.ul.com
  3. ​European Committee for Standardization (CEN)​​​​Official website: www.cen.eu
  4. ​Standardization Administration of China (SAC)​​​​Official website: www.sac.gov.cn
  5. ​Zhongguancun Energy Storage Industry Technology Alliance (CNESA)​​​​Official website: www.cnESA.org
  6. ​International Organization for Standardization (ISO)​​​​Official website: www.iso.org

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