Energy Meter GoodWe GMK120 RS485 / Modbus RTU

GoodWe Smart Meter GMK120

A GoodWe-native residential smart meter for solar homes that want cleaner import/export visibility and tighter fit with GoodWe inverters or storage workflows without stepping up to a larger commercial meter.

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Why it matters

GoodWe positions the GMK120 as the residential North America smart meter in this family. It is built for single-phase and split-phase homes that need cleaner import, export, and household-load visibility inside compatible GoodWe inverter systems.

Best fit

This model makes the most sense when a household already expects to stay inside the GoodWe ecosystem and wants a meter that aligns cleanly with GoodWe export control, inverter monitoring, and home energy workflows.

What buyers should know

The official source set points to RS485 Modbus RTU communication, DIN-rail installation, and two included 200A:50mA CTs. GoodWe's North America quick guide shows GMK120 and GMK140 as closely related residential models, while the GM330 sits in the larger three-phase commercial slot.

Practical caution

This is not a general-purpose app-first home energy monitor. It is strongest when the rest of the system already leans on a compatible GoodWe inverter and SEMS-style monitoring path.

Product Images

Gallery, diagrams, and supporting visuals.

GoodWe North America residential smart meter family front render — Official GoodWe residential smart meter family front render reused for GMK120 because the current North America source lane is family-level and did not expose a separate downloadable GMK120-only render during the 2026-05-19 review.

GoodWe North America residential smart meter family angled render — Official GoodWe residential smart meter family angled render reused for GMK120 because the current North America source lane is family-level and did not expose a separate downloadable GMK120-only render during the 2026-05-19 review.

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Phase support: 1P2W / 1P3W
Installation: DIN-rail mounted residential smart meter with included current transformers
Measurement: CT-based single-phase / split-phase smart meter for PV consumption, load, and export-power monitoring
Max current: 200 A
Accuracy class: Class 0.5 (voltage/current and active energy) / Class 1 (reactive energy)
Current sensing: 2 x 200A:50mA current transformers included
Local API: No
Cloud dependency: GoodWe SEMS and compatible GoodWe inverter workflows are typically used for normal monitoring, export-power limiting, and household load visibility.
Home Assistant: No
Solar import/export: Yes
Availability: North America official page / broader regional availability varies

Last verified: May 19, 2026
Product page: Official page
Documentation: Official docs
Notes: Verified on 2026-05-19 against GoodWe's official Smart Meter North America product page, the current Smart Meter-US Series datasheet V2.1, the current GMK120 / GMK140 / GM330 Quick Installation Guide V1.2 dated 2024-02-25, and the current ES-US / SBP-US user-manual source set that references the GMK120 smart meter network. The reviewed official source set confirms GMK120 as the residential single-phase / split-phase member of the North America smart meter family, with 2 included 200A:50mA CTs, RS485 Modbus RTU communication, DIN-rail installation, Class 0.5 voltage/current and active-energy accuracy, Class 1 reactive-energy accuracy, and GoodWe-oriented export-power-limit plus load-monitoring use.