Facility UPS Uninterruptible Power Supply Battery Health Audit
Standard procedure for in-depth health verification, impedance testing, and thermal imaging of stationary VRLA/Lead-Acid battery banks in 3-phase UPS systems to ensure runtime reliability and prevent thermal runaway.
Establish baseline battery string impedance values, identify weak or marginal cells before they fail under load, and ensure upstream protective device coordination remains valid as internal resistance rises. A systematic failure to trend impedance data is the leading cause of preventable UPS runtime loss during mains disturbances.
Applies to all stationary Valve-Regulated Lead-Acid (VRLA) and Flooded Lead-Acid (VLA) battery strings supporting critical process UPS systems rated above 50 kVA. This audit covers open-rack and enclosed cabinet configurations commonly found in heavy industrial manufacturing and data centre environments.
- Verify UPS static bypass is engaged and battery breaker is locked in open position. Verify absence of DC voltage with calibrated voltmeter before proceeding.
- Category 2 arc flash suit, insulating rubber gloves (Class 00 minimum), safety glasses with side shields, and steel-toed boots. No exceptions.
- Insulated tools only. Verify torque wrench calibration against certificate prior to use.
- Ensure ventilation is active and hydrogen gas monitor is functional before opening battery cabinet or cover.
- Fluke 500 Series Battery Analyzer (or equivalent BITE3/PITE)
- Infrared Thermal Imaging Camera (≥160x120 resolution, ±2°C accuracy)
- Digital Multimeter, CAT III / 1000V rated, with calibrated leads
- Insulated Torque Wrench (10–50 N·m range, with current calibration certificate)
- Personal Protective Equipment (Arc Flash Cat 2, Rubber Gloves Class 00)
- SOP Log Sheet or ServiceGrid Mobile App for data capture