Mostly to seller: is there a published communication module data description so we can write our own code to read the usb module output? or, an sdk?

Note: amazon is showing this question on products that don't have Modbus. PZEM-014/016 is the module you want for PC only interface, PZEM-022 for display only.

For 240v install/Monitoring, instead of running a hot and neutral (black and white) to the display, can I run both black legs from 240v (120v + 120v)?

+1 what brycen says for United States 240V split phase service that uses 2 120V circuits. I clamped the coil over one of the hot legs and wired each hot leg to the load terminals on the meter. All measurements were accurate; amps, watts, volts, hertz, total power used, and power factor. I'm using this meter to monitor power supplied to a heating element for a brew kettle, which utilizes a Blichmann power controller to power the heating element. If you're using this for a similar purpose, wire the meter into the circuit BEFORE the power controller. Initially I wired it after the controller, which resulted in inaccurate readings..

does this work without having neutral wire? in many (old) houses in Saudi Arabia we use 2 x 110V = 220V, both live

yes, I have one in the us on 240volts. 2 hot wires, one to the terminal marked hot and the other hot to the terminal marked neutral and it has been working for over a year so far.

Can this meter be powered by 120v ac and used to read 220v ac for an air conditioning compressor?

As suggested, I bought two meters. Each is clamped over one leg of the power for the AC (120v+120v). I see current, volts and amps for each leg. Each meter is plugged into a standard 120v outlet. They are mounted in the garage on the wall opposite the breaker box (which is on the outside of the house.) Now I need a way to capture the information. I have an app that captures how often the AC blower fan comes on. I suppose if I get some averages of amperage used by the rest of the AC unit, under various outside temperatures, I can get a rough idea of how much power is being used.

Pzem 022 | Desertcart KSA

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Description

⚡ Power up your control with precision and ease!

SMART OVERLOAD ALERTS - Visual alarm flashes on overload, keeping your systems safe and sound.
RELIABLE DATA RETENTION - Power-off memory saves your energy data and settings—never lose track.
ALL IN ONE POWER INSIGHT - Monitor voltage, current, wattage, kWh, frequency & power factor in one sleek panel.
VERSATILE WIDE VOLTAGE RANGE - Supports 80-260V circuits, perfect for home, RV, generator, or light commercial use.
EFFORTLESS SPLIT CORE INSTALLATION - Clamp-on 100A CT means no wire cutting—install in minutes, stress-free.

The AC 80-260V 100A Hardwired Power Meter by MORNING GROUP is a professional-grade energy monitor featuring a clear LCD that tracks voltage, current, wattage, kWh, frequency, and power factor. Its split-core 100A current transformer enables quick, no-cut installation on 80-260V circuits, ideal for generators, RVs, workshops, and light commercial panels. With power-off memory and a visual overload alarm, it ensures reliable, real-time energy management and safety.

Specifications

ASIN	B07JB9B2QL
Best Sellers Rank	#24,935 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Industrial Power Meters
Brand	MORNING GROUP
Brand Name	MORNING GROUP
Color	Black
Compatible Devices	Standard AC Electrical Circuits (80-260V, 100A)
Customer Reviews	4.4 out of 5 stars 2,250 Reviews
Item Dimensions	3.42 x 0.95 x 1.85 inches
Item Highlight	Energy Monitor, for Generator, RV, Panel and Appliance Load, Split-Core Current Transformer, Hardwired
Item Weight	0.16 kg
Item dimensions L x W x H	3.42 x 0.95 x 1.85 inches
Manufacturer	Wenzhou Morning Electronics Co., LTD
Maximum Alternating Current	100 A
Maximum Operating Voltage	260 volts_of_alternating_current
Measurement Type	Ammeter, Multimeter, Voltmeter
Minimum Operating Voltage	80
Model	PZEM-022
Number of Items	1
Number of Packs	1
Part Number	ekspqcmdyw1126t
Power Source	Corded Electric
Style	1 Piece AC 100A Meter(Split Core Transformer)
Style Name	1 Piece AC 100A Meter(Split Core Transformer)
UPC	703931915688
Unit Count	1 Count

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