What does this mean?Pros & Cons
Pros
The usb side powers the usb. The mains powers the rest of the components.
Highlights
Quality
I have two of them connected to an arduino with battery backup and they monitor my main circuit breakers 24/7, recording every ... Read More
The directions provided with the device are poor, even inaccurate (the crc16 that's used for the protocol is specified incorrec... Read More
The device will not work until it's got power from both the mains (ac input) and the usb side.
One of the weird problems with this device's design (might not be an issue for most people) is it reads the voltage from the a/... Read More
Competitiveness
I did a handful of comparisons with the measurement from the utility company meter and it matches reasonably well.
I compared to the output of a clamp ammeter and it was correct.
Overview
- How are reviewers describing this item?
daily. - Our engine has profiled the reviewer patterns and has determined that there is minimal deception involved.
- Our engine has discovered that over 90% high quality reviews are present.
- This product had a total of 15 reviews as of our last analysis date on Sep 3 2024.
Helpful InsightsBETA
Posted by a reviewer on Amazon
The one flaw is that these devices lose their memory of consumed energy kwh the moment theyre powered off so if youve used 20kwh of energy and the power drops when it comes back these will show 0 kwh of consumption again
Posted by a reviewer on Amazon
Thats where the batterybacked arduino comes in it can remember think eeprom each kwh reading per day and if the power comes back it can start appending to its remembered reading instead of starting over
Posted by a reviewer on Amazon
Heck ill just show you a photo or two
Posted by a reviewer on Amazon
Im just now finishing up a second monitor that connects to 14 of these little pzems and watches them for exactly 24 hours recording only current and showing the timedomain usage patterns for those 14 channels
Posted by a reviewer on Amazon
Ill probably add yet a third simpler type that records daily energy consumption for one month at a time but only for one channel so i can monitor questionable circuits like my outdoor outlets for example or my barn lighting
Posted by a reviewer on Amazon
The directions provided with the device are poor even inaccurate the crc16 thats used for the protocol is specified incorrectly in the documentation its least significant byte first but there is a lot of documentation available for the device pzem004t v3 if you look online
Posted by a reviewer on Amazon
The arduino library for the device has the 34c34 source code needed to get communications working with the gizmo
Posted by a reviewer on Amazon
The device will not work until its got power from both the mains ac input and the usb side
Review Count History
Price History
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