Plug in line voltage monitoring

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SATTV

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#306792 21-Aug-2023 18:46

Hi all,

I am looking for a plug in line voltage monitoring device.

Since moving into our new home we have had a few bulbs blow and lights flickering.

I want to log the line voltage for a bit before the electrician comes to have a look.

A UPS can do the basics of this but I dont want it squawking in the middle of the night if there is a line voltage drop, something with a bit more resolution would be good, i.e. records a reading every second or so.

Does anyone know of something that is relatively cost effective?

Thanks

John

I know enough to be dangerous

concordnz

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#3118750 21-Aug-2023 18:54

Some plug in power meters have a 'min/max recording you can get these for $15-$25 - but a UPS is your best solution, because its software should offer "time based recording"/graphs which will show exactly how unstable your power is - or what times it is worst. (which is relivant)

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timmmay

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#3118757 21-Aug-2023 19:25

These esphome plugs do it. Integrate with Home Assistant and you can graph the line voltage.

Here's a really basic graph pulled from the entity history, generated automatically. You can make nicer graphs, keep more history, etc.

The plugs cost very little, but Home Assistant has a bit of a learning curve.

coffeebaron

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#3118827 21-Aug-2023 20:39

See if you can track down an ONEAC onegraph. This is what I used back in my ATM days.

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Virgil

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#3118851 21-Aug-2023 23:03

coffeebaron: See if you can track down an ONEAC onegraph. This is what I used back in my ATM days.

That was my first thought too! I'm sure that device must still be kicking around a parts depot somewhere ...

Lurking ...

SATTV

1480 posts

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#3118886 22-Aug-2023 07:36

coffeebaron: See if you can track down an ONEAC onegraph. This is what I used back in my ATM days.

Sadly I cant see one online for sale so I will have to go with the cheap one above.

I know enough to be dangerous

SATTV

1480 posts

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#3118887 22-Aug-2023 07:38

timmmay:

These esphome plugs do it. Integrate with Home Assistant and you can graph the line voltage.

Here's a really basic graph pulled from the entity history, generated automatically. You can make nicer graphs, keep more history, etc.

The plugs cost very little, but Home Assistant has a bit of a learning curve.

Thanks for that,

I dont use home assistant, one which had the logging built in would be better but this is the best option so far, I will order one and try setting up HA over the next week to see what happens.

John

I know enough to be dangerous

timmmay

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#3118888 22-Aug-2023 07:52

SATTV:

Thanks for that,

I dont use home assistant, one which had the logging built in would be better but this is the best option so far, I will order one and try setting up HA over the next week to see what happens.

John

I don't know if it has any memory built in or not. I know the plug has an http server built in and you can browse to it, but I don't know if it keeps history. It might keep some, but I don't know if it can do anything useful with it.