Iotawatt reads voltage drops

this is now for a month ongoing that iotawatt reads voltage drops to 0V! that are not existing.
how do i fix this?
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This looks like a problem that was recently fixed, but I don’t have enough information to say that definitively. Could you post a screenshot of your status display and the message log for the period that is graphed?

I see that you are in a 230V country. Are you satisfied that there is no issue with the VT plug being intermittent?

log:

9/23/19 10:59:48z Reset reason: Software/System restart
9/23/19 10:59:48z Trace:  1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:1[5], 1:2[6], 9:0[6], 9:0, 9:1, 8:4, 8:6, 8:8, 8:9, 9:3, 9:5, 9:9, 1:2, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[5], 1:6, 1:3, 1:4, 1:5[21]
9/23/19 10:59:48z ESP8266 ChipID: 2528707
9/23/19 10:59:48z IoTaWatt 4.x, Firmware version 02_04_00
9/23/19 10:59:48z SPIFFS mounted.
9/23/19 11:59:50 Local time zone: +1:00
9/23/19 11:59:50 device name: IotaWatt
9/23/19 11:59:50 MDNS responder started for hostname IotaWatt
9/23/19 11:59:50 LLMNR responder started for hostname IotaWatt
9/23/19 11:59:50 HTTP server started
9/23/19 11:59:51 WiFi connected. SSID=Black_Ubiquiti_2.4Ghz_IOT_02, IP=192.168.1.141, channel=10, RSSI -51db
9/23/19 11:59:51 timeSync: service started.
9/23/19 11:59:51 statService: started.
9/23/19 11:59:51 Updater: service started. Auto-update class is MAJOR
9/23/19 11:59:51 dataLog: service started.
9/23/19 11:59:52 dataLog: Last log entry 09/23/19 11:59:45
9/23/19 11:59:53 historyLog: service started.
9/23/19 11:59:54 historyLog: Last log entry 09/23/19 11:59:00
9/23/19 11:59:55 Updater: Auto-update is current for class MAJOR.
9/23/19 11:59:56 EmonService: started. url=192.168.1.140:8082, node=IotaWatt, interval=10
9/23/19 11:59:56 influxDB: started, url=192.168.1.140:8086, db=iotawatt, interval=15
9/23/19 11:59:57 influxDB: Start posting at 09/23/19 11:59:45
9/23/19 12:01:48 EmonService: Start posting at 09/23/19 11:59:10
9/23/19 12:58:46 Heap memory has degraded below safe minimum, restarting.

** Restart **

SD initialized.
9/23/19 11:58:48z Real Time Clock is running. Unix time 1569239928 
9/23/19 11:58:48z Reset reason: Software/System restart
9/23/19 11:58:48z Trace:  3:11, 1:6, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:1[14], 1:2, 9:0, 9:0, 8:4, 8:6, 8:8, 8:9, 1:2, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[21]
9/23/19 11:58:48z ESP8266 ChipID: 2528707
9/23/19 11:58:48z IoTaWatt 4.x, Firmware version 02_04_00
9/23/19 11:58:48z SPIFFS mounted.
9/23/19 12:58:50 Local time zone: +1:00
9/23/19 12:58:50 device name: IotaWatt
9/23/19 12:58:50 MDNS responder started for hostname IotaWatt
9/23/19 12:58:50 LLMNR responder started for hostname IotaWatt
9/23/19 12:58:50 HTTP server started
9/23/19 12:58:51 WiFi connected. SSID=Black_Ubiquiti_2.4Ghz_IOT_02, IP=192.168.1.141, channel=10, RSSI -52db
9/23/19 12:58:51 timeSync: service started.
9/23/19 12:58:51 statService: started.
9/23/19 12:58:51 Updater: service started. Auto-update class is MAJOR
9/23/19 12:58:51 dataLog: service started.
9/23/19 12:58:52 dataLog: Last log entry 09/23/19 12:58:45
9/23/19 12:58:53 historyLog: service started.
9/23/19 12:58:54 historyLog: Last log entry 09/23/19 12:58:00
9/23/19 12:58:55 Updater: Auto-update is current for class MAJOR.
9/23/19 12:58:56 EmonService: started. url=192.168.1.140:8082, node=IotaWatt, interval=10
9/23/19 12:58:56 influxDB: started, url=192.168.1.140:8086, db=iotawatt, interval=15
9/23/19 12:58:57 EmonService: Start posting at 09/23/19 12:58:20
9/23/19 12:58:58 influxDB: Start posting at 09/23/19 12:58:45
9/23/19 13:41:31 Heap memory has degraded below safe minimum, restarting.

** Restart **

SD initialized.
9/23/19 12:41:33z Real Time Clock is running. Unix time 1569242493 
9/23/19 12:41:33z Reset reason: Software/System restart
9/23/19 12:41:33z Trace:  1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:1[10], 1:2[11], 9:0[11], 9:0, 9:1, 8:4, 8:6, 8:8, 8:9, 9:3, 9:5, 9:9, 1:2, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[21]
9/23/19 12:41:33z ESP8266 ChipID: 2528707
9/23/19 12:41:33z IoTaWatt 4.x, Firmware version 02_04_00
9/23/19 12:41:33z SPIFFS mounted.
9/23/19 13:41:35 Local time zone: +1:00
9/23/19 13:41:35 device name: IotaWatt
9/23/19 13:41:35 MDNS responder started for hostname IotaWatt
9/23/19 13:41:35 LLMNR responder started for hostname IotaWatt
9/23/19 13:41:35 HTTP server started
9/23/19 13:41:36 WiFi connected. SSID=Black_Ubiquiti_2.4Ghz_IOT_02, IP=192.168.1.141, channel=10, RSSI -52db
9/23/19 13:41:36 timeSync: service started.
9/23/19 13:41:36 statService: started.
9/23/19 13:41:36 Updater: service started. Auto-update class is MAJOR
9/23/19 13:41:36 dataLog: service started.
9/23/19 13:41:37 dataLog: Last log entry 09/23/19 13:41:30
9/23/19 13:41:38 historyLog: service started.
9/23/19 13:41:39 historyLog: Last log entry 09/23/19 13:41:00
9/23/19 13:41:40 Updater: Auto-update is current for class MAJOR.
9/23/19 13:41:41 EmonService: started. url=192.168.1.140:8082, node=IotaWatt, interval=10
9/23/19 13:41:41 influxDB: started, url=192.168.1.140:8086, db=iotawatt, interval=15
9/23/19 13:41:42 influxDB: Start posting at 09/23/19 13:41:30
9/23/19 13:42:25 EmonService: Start posting at 09/23/19 13:40:30
9/23/19 14:44:55 Heap memory has degraded below safe minimum, restarting.

** Restart **

SD initialized.
9/23/19 13:44:57z Real Time Clock is running. Unix time 1569246297 
9/23/19 13:44:57z Reset reason: Software/System restart
9/23/19 13:44:57z Trace:  9:9, 1:2, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[19], 1:6, 1:1[3], 1:2[4], 9:0[4], 9:0, 9:1, 8:4, 8:6, 8:8, 8:9, 9:3, 9:5, 9:9, 1:2, 1:3, 1:4, 1:5[5], 1:6, 1:3, 1:4, 1:5[21]
9/23/19 13:44:57z ESP8266 ChipID: 2528707
9/23/19 13:44:57z IoTaWatt 4.x, Firmware version 02_04_00
9/23/19 13:44:57z SPIFFS mounted.
9/23/19 14:44:59 Local time zone: +1:00
9/23/19 14:44:59 device name: IotaWatt
9/23/19 14:44:59 MDNS responder started for hostname IotaWatt
9/23/19 14:44:59 LLMNR responder started for hostname IotaWatt
9/23/19 14:44:59 HTTP server started
9/23/19 14:45:00 timeSync: service started.
9/23/19 14:45:00 statService: started.
9/23/19 14:45:00 dataLog: service started.
9/23/19 14:45:01 dataLog: Last log entry 09/23/19 14:44:55
9/23/19 14:45:01 historyLog: service started.
9/23/19 14:45:02 historyLog: Last log entry 09/23/19 14:44:00
9/23/19 14:45:02 WiFi connected. SSID=Black_Ubiquiti_2.4Ghz_IOT_02, IP=192.168.1.141, channel=10, RSSI -53db
9/23/19 14:45:02 Updater: service started. Auto-update class is MAJOR
9/23/19 14:45:04 Updater: Auto-update is current for class MAJOR.
9/23/19 14:45:05 EmonService: started. url=192.168.1.140:8082, node=IotaWatt, interval=10
9/23/19 14:45:05 influxDB: started, url=192.168.1.140:8086, db=iotawatt, interval=15
9/23/19 14:45:06 influxDB: Start posting at 09/23/19 14:45:00
9/23/19 14:46:55 EmonService: Start posting at 09/23/19 14:44:30
9/23/19 15:20:10 Heap memory has degraded below safe minimum, restarting.

** Restart **

SD initialized.
9/23/19 14:20:12z Real Time Clock is running. Unix time 1569248412 
9/23/19 14:20:12z Reset reason: Software/System restart
9/23/19 14:20:12z Trace:  8:8, 8:9, 9:3, 9:5, 9:9, 1:2, 1:3, 1:4, 1:5[3], 3:0, 3:11, 1:6, 1:3, 1:4, 1:5[19], 1:6, 1:1[9], 1:2[10], 9:0[10], 9:0, 9:1, 8:4, 8:6, 8:8, 8:9, 9:3, 9:5, 9:9, 1:2, 1:3, 1:4, 1:5[21]
9/23/19 14:20:12z ESP8266 ChipID: 2528707
9/23/19 14:20:12z IoTaWatt 4.x, Firmware version 02_04_00
9/23/19 14:20:12z SPIFFS mounted.
9/23/19 15:20:14 Local time zone: +1:00
9/23/19 15:20:14 device name: IotaWatt
9/23/19 15:20:14 MDNS responder started for hostname IotaWatt
9/23/19 15:20:14 LLMNR responder started for hostname IotaWatt
9/23/19 15:20:14 HTTP server started
9/23/19 15:20:15 WiFi connected. SSID=Black_Ubiquiti_2.4Ghz_IOT_02, IP=192.168.1.141, channel=10, RSSI -58db
9/23/19 15:20:15 timeSync: service started.
9/23/19 15:20:19 statService: started.
9/23/19 15:20:19 Updater: service started. Auto-update class is MAJOR
9/23/19 15:20:19 dataLog: service started.
9/23/19 15:20:20 dataLog: Last log entry 09/23/19 15:20:10
9/23/19 15:20:20 historyLog: service started.
9/23/19 15:20:21 historyLog: Last log entry 09/23/19 15:20:00
9/23/19 15:20:25 EmonService: started. url=192.168.1.140:8082, node=IotaWatt, interval=10
9/23/19 15:20:25 influxDB: started, url=192.168.1.140:8086, db=iotawatt, interval=15
9/23/19 15:20:39 Updater: Auto-update is current for class MAJOR.
9/23/19 15:21:03 EmonService: Start posting at 09/23/19 15:18:40
9/23/19 15:21:03 influxDB: Start posting at 09/23/19 15:20:15
9/23/19 16:44:51 Heap memory has degraded below safe minimum, restarting.

** Restart **

SD initialized.
9/23/19 15:44:52z Real Time Clock is running. Unix time 1569253492 
9/23/19 15:44:52z Reset reason: Software/System restart
9/23/19 15:44:52z Trace:  18:2, 18:3, 18:2, 18:3, 18:2, 18:3, 18:2, 18:3, 18:2, 18:3, 18:2, 18:3, 18:4, 18:5, 1:6, 1:3, 10:0, 10:14, 10:14, 10:14, 10:14, 10:14, 10:14, 10:14, 10:15, 10:16, 10:17, 10:22, 10:23, 10:17, 1:4, 1:5[21]
9/23/19 15:44:52z ESP8266 ChipID: 2528707
9/23/19 15:44:52z IoTaWatt 4.x, Firmware version 02_04_00
9/23/19 15:44:52z SPIFFS mounted.
9/23/19 16:44:54 Local time zone: +1:00
9/23/19 16:44:54 device name: IotaWatt
9/23/19 16:44:54 MDNS responder started for hostname IotaWatt
9/23/19 16:44:54 LLMNR responder started for hostname IotaWatt
9/23/19 16:44:54 HTTP server started
9/23/19 16:44:55 timeSync: service started.
9/23/19 16:44:55 statService: started.
9/23/19 16:44:55 dataLog: service started.
9/23/19 16:44:56 dataLog: Last log entry 09/23/19 16:44:50
9/23/19 16:44:56 historyLog: service started.
9/23/19 16:44:57 historyLog: Last log entry 09/23/19 16:44:00
9/23/19 16:44:57 WiFi connected. SSID=Black_Ubiquiti_2.4Ghz_IOT_02, IP=192.168.1.141, channel=10, RSSI -52db
9/23/19 16:44:58 Updater: service started. Auto-update class is MAJOR
9/23/19 16:45:00 EmonService: started. url=192.168.1.140:8082, node=IotaWatt, interval=10
9/23/19 16:45:00 influxDB: started, url=192.168.1.140:8086, db=iotawatt, interval=15
9/23/19 16:45:00 Updater: Auto-update is current for class MAJOR.
9/23/19 16:45:02 influxDB: Start posting at 09/23/19 16:45:00
9/23/19 16:45:41 EmonService: Start posting at 09/23/19 16:44:20


is this fixed with 02_04_02 firmware ?

Yes, the problem of low-voltage spike on restart is fixed in 02_04_02. That said it’s only a symptom of a larger problem that your IoTaWatt is restarting every few hours. That’s not normal and should be addressed. There is something wrong, and the heap degradation that is causing it is almost always associated with WiFi issues.

I will advance 02_04_02 release to MINOR auto update tonight if you want to update.

Looking at the above information, and going back over your previous posts from last January, I will reiterate that it is my belief your derived reference three-phase is not setup correctly. The way you left it in January was that you were certain it was correct and I was maintaining that it wasn’t. I had suggested you try to reconcile with the meter, but there was no follow up. I will assume you did not as I believe it would not match the meter, as a correct configuration would.