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Building power monitoring

power monitor online by Rafael Costa

Incoming supply for the whole building. Tenants ask what happened. Now I can tell them.

Latest Reading

Supply voltage

234.3 V

Minimum voltage

231.5 V

Frequency

49.99 Hz

Harmonic distortion

2.5 %

Mains available

100 %

Outages

0

Time without mains

0 min

Voltage sags

0

Last updated: 11/1/2026, 5:29:56 AM

Insights

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

Historical Plot

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Telemetry Data

Live
TimeSupply voltage (V)Minimum voltage (V)Frequency (Hz)Harmonic distortion (%)Mains available (%)Outages Time without mains (min)Voltage sags
11/1/2026, 5:29:56 AM234.3 V231.5 V49.99 Hz2.5 %100 %00 min0
11/1/2026, 5:14:49 AM232.8 V231.3 V49.98 Hz2.4 %100 %00 min0
11/1/2026, 4:59:40 AM232.8 V201.3 V50 Hz2.4 %100 %00 min1
11/1/2026, 4:44:33 AM233.2 V205.9 V50 Hz2.2 %100 %00 min1
11/1/2026, 4:29:28 AM233.8 V204.7 V50 Hz2.2 %100 %00 min1
11/1/2026, 4:14:21 AM233.8 V232.5 V49.99 Hz2.2 %100 %00 min0
11/1/2026, 3:59:13 AM234.1 V230 V49.99 Hz2.2 %100 %00 min0
11/1/2026, 3:44:06 AM233 V230.2 V50 Hz2.3 %100 %00 min0
11/1/2026, 3:28:55 AM233 V230.2 V50.01 Hz2.2 %100 %00 min0
11/1/2026, 3:13:48 AM231.4 V198.4 V49.99 Hz2.1 %100 %00 min1
11/1/2026, 2:58:41 AM233.3 V228.7 V49.99 Hz2.2 %100 %00 min0
11/1/2026, 2:43:34 AM233.1 V230.5 V50.01 Hz2.1 %100 %00 min0
11/1/2026, 2:28:29 AM232.8 V229.4 V50.01 Hz2.1 %100 %00 min0
11/1/2026, 2:13:23 AM232.4 V228.4 V50.01 Hz2.1 %100 %00 min0
11/1/2026, 1:58:18 AM232.5 V229.1 V50.02 Hz2.1 %100 %00 min0
11/1/2026, 1:43:11 AM231.6 V228.2 V49.99 Hz2 %100 %00 min0
11/1/2026, 1:28:02 AM231.5 V229.4 V50 Hz2.1 %100 %00 min0
11/1/2026, 1:12:55 AM231.3 V229 V50.02 Hz2.1 %100 %00 min0
11/1/2026, 12:57:47 AM230.1 V194.4 V50 Hz2 %100 %00 min1
11/1/2026, 12:27:35 AM230.5 V228.6 V49.99 Hz2.1 %100 %00 min0
11/1/2026, 12:12:26 AM230.8 V227.2 V49.99 Hz2.1 %100 %00 min0
10/31/2026, 11:57:20 PM231 V227.7 V49.99 Hz2.1 %100 %00 min0
10/31/2026, 11:42:14 PM231.1 V227.8 V50.01 Hz2 %100 %00 min0
10/31/2026, 11:27:03 PM231.8 V227.7 V49.98 Hz2.2 %100 %00 min0
10/31/2026, 11:11:56 PM231.4 V226.9 V49.99 Hz2.1 %100 %00 min0