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UPS and power quality

power monitor online by Nadia Haddad

Monitoring at the board. We had equipment failing and nobody could say why. Turned out to be sags, not the equipment.

Latest Reading

Supply voltage

240.5 V

Minimum voltage

209.1 V

Frequency

49.99 Hz

Harmonic distortion

2.1 %

Mains available

100 %

Outages

0

Time without mains

0 min

Voltage sags

1

Last updated: 9/17/2026, 2:21:25 AM

Insights

↑ rising ↗ trending up → stable ↘ trending down ↓ falling L = low, ~ = avg, H = high anomaly

Historical Plot

Drag on chart to zoom in

Telemetry Data

Live
TimeSupply voltage (V)Minimum voltage (V)Frequency (Hz)Harmonic distortion (%)Mains available (%)Outages Time without mains (min)Voltage sags
9/17/2026, 2:21:25 AM240.5 V209.1 V49.99 Hz2.1 %100 %00 min1
9/17/2026, 2:11:24 AM241.7 V239.9 V49.99 Hz2 %100 %00 min0
9/17/2026, 2:01:23 AM242.4 V239.3 V50 Hz2 %100 %00 min0
9/17/2026, 1:51:17 AM242.5 V239.6 V49.99 Hz2 %100 %00 min0
9/17/2026, 1:41:15 AM241.9 V240.4 V50 Hz2.2 %100 %00 min0
9/17/2026, 1:31:14 AM241.5 V239.3 V50.01 Hz2.1 %100 %00 min0
9/17/2026, 1:21:13 AM241.5 V237.4 V50 Hz2.2 %100 %00 min0
9/17/2026, 1:11:11 AM241.3 V238.9 V50 Hz2.1 %100 %00 min0
9/17/2026, 1:01:07 AM241.7 V239.1 V49.99 Hz2 %100 %00 min0
9/17/2026, 12:51:01 AM241.2 V237.1 V49.99 Hz2 %100 %00 min0
9/17/2026, 12:40:59 AM240.7 V238.6 V50.01 Hz2.1 %100 %00 min0
9/17/2026, 12:30:58 AM240.1 V238.3 V49.97 Hz2.1 %100 %00 min0
9/17/2026, 12:20:56 AM239.4 V236.1 V49.99 Hz2.1 %100 %00 min0
9/17/2026, 12:10:55 AM240 V236.3 V50.02 Hz2 %100 %00 min0
9/17/2026, 12:00:51 AM239.4 V237.4 V50 Hz2.1 %100 %00 min0
9/16/2026, 11:50:49 PM242.1 V239.2 V50.01 Hz2 %100 %00 min0
9/16/2026, 11:40:48 PM242 V238.3 V50 Hz2.3 %100 %00 min0
9/16/2026, 11:30:47 PM241.6 V237.5 V50 Hz2.2 %100 %00 min0
9/16/2026, 11:20:45 PM241.1 V238.4 V50 Hz2 %100 %00 min0
9/16/2026, 11:10:44 PM238.8 V203.7 V50 Hz2.2 %100 %00 min1
9/16/2026, 11:00:44 PM240.8 V238.1 V49.99 Hz2.2 %100 %00 min0
9/16/2026, 10:50:43 PM239.7 V237.8 V50.01 Hz2 %100 %00 min0
9/16/2026, 10:40:41 PM239.7 V238 V49.99 Hz2.1 %100 %00 min0
9/16/2026, 10:30:40 PM238.7 V237.8 V50.02 Hz2.1 %100 %00 min0
9/16/2026, 10:20:38 PM239.3 V237.5 V50 Hz2.1 %100 %00 min0