OpenEnergyMonitor emonTx3 (emonTx3): OpenEnergyMonitor's product image of the emonTx3 (emonTx3) on its own product page.

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Photo sources

Manufacturer and seller images. Configuration examples may include additional equipment.

Image source: OpenEnergyMonitor's product image of the emonTx3 (emonTx3) on its own product page.

OpenEnergyMonitor emonTx3 (emonTx3)

Name: OpenEnergyMonitor emonTx3 (emonTx3)
Brand: OpenEnergyMonitor
SKU: emonTx3

By OpenEnergyMonitorSKU emonTx3

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Device typeNot yet documented Max switched load (A)Not statedMax switched load (W)Not statedMeasurement channels4 Current sensors100 (CT 1-3); 19 (CT 4) A Current ratingNot stated

Key specs

Units

SKU: emonTx3
Official product page
Sources
Printed as "The emonTx3 is a low power RF remote sensor node. Data is transmitted to an emonPi or an emonBase via a low power 433 MHz radio.".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: docs Overview
Documented
Power input: AC-AC adapter; or 3 x AA batteries
Official product page
Sources
Printed as "Can be powered by a single AC-AC adaptor (DC PSU not required)".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Mounting: wall-mount option
Official product page
Sources
Printed as "Wall-mount option".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Communications: 433 MHz radio; optional ESP8266 WiFi adapter
Official product page
Sources
Printed as "WiFi option: It is possible to use an emonTx with a ESP8266 WiFi adapter to provide WiFi connectivity.".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Current sensors: 100 (CT 1-3); 19 (CT 4) A
Official product page
Sources
Printed as "CT 1-3 are standard 100A / 24KW max CT inputs (@240V)".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Measurement channels: 4
Official product page
Sources
Printed as "4x CT Sensor inputs for single-phase AC electricity monitoring designed for use with the 100A SCT-013-000 CT sensor".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Operating temperature: -40 to 40 °C-40 to 104 °F converted
Official product page
Sources
Printed as "Operating Temperature Temperature -40C +40C +85C".
Official product page: emonTx3 docs: Technical Checked Oct 12, 2026 · Earlier document
Location: docs Technical, Electrical characteristics table (Min / Recommended Max / Absolute Max)
Documented

All specs6

Power input: AC-AC adapter; or 3 x AA batteries
Official product page
Sources
Printed as "Can be powered by a single AC-AC adaptor (DC PSU not required)".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Mounting: wall-mount option
Official product page
Sources
Printed as "Wall-mount option".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Communications: 433 MHz radio; optional ESP8266 WiFi adapter
Official product page
Sources
Printed as "WiFi option: It is possible to use an emonTx with a ESP8266 WiFi adapter to provide WiFi connectivity.".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Current sensors: 100 (CT 1-3); 19 (CT 4) A
Official product page
Sources
Printed as "CT 1-3 are standard 100A / 24KW max CT inputs (@240V)".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Measurement channels: 4
Official product page
Sources
Printed as "4x CT Sensor inputs for single-phase AC electricity monitoring designed for use with the 100A SCT-013-000 CT sensor".
Official product page: OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026) Checked Oct 12, 2026 · Earlier document
Location: Product page and documents as quoted
Documented
Operating temperature: -40 to 40 °C-40 to 104 °F converted
Official product page
Sources
Printed as "Operating Temperature Temperature -40C +40C +85C".
Official product page: emonTx3 docs: Technical Checked Oct 12, 2026 · Earlier document
Location: docs Technical, Electrical characteristics table (Min / Recommended Max / Absolute Max)
Documented

Published claims and calculations, not independent test results.

Documents

1 on file

WEB
OpenEnergyMonitor product page: emonTx3 (captured October 12, 2026)OfficialOpenEnergyMonitorOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-12.
Location: Product page
Retrieved Oct 12, 2026
OpenEnergyMonitor's own product page, captured October 12, 2026 with the paced research fetcher. Manufacturer statements, not independent tests.
Open

Archive and older revisions2

Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.

WEB
OpenEnergyMonitor docs: System Overview (navigation lists Main System and Older Hardware)OfficialOpenEnergyMonitorOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-12.
Location: Product page
Retrieved Oct 12, 2026
OpenEnergyMonitor's own product page, captured October 12, 2026 with the paced research fetcher. Manufacturer statements, not independent tests.
Open
WEB
emonTx3 docs: TechnicalOfficialOpenEnergyMonitorOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-12.
Location: Product page
Retrieved Oct 12, 2026
OpenEnergyMonitor's own product page, captured October 12, 2026 with the paced research fetcher. Manufacturer statements, not independent tests.
Open