UPS, inverter and battery functional tests should be done at most every six months, including physical testing of connected alarms, verifying transfer from rectifier to battery within 0.5 s and static switch operation within 0.5 s on inverter fault, and no-break performance where required. Self-diagnostic tests can supplement. Full-service tests should show batteries hold charge on bypass, test the UPS on line with mains disconnected monitoring discharge voltage and current over at least 10 minutes, observe recharge, verify rectifier, inverter, static and bypass switches, tighten connections and verify waveforms.
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