There is typically one main button (or touch area) on the front.
| Parameter | Register Address (hex) | Data type | Scaling | |-----------|------------------------|-----------|---------| | Voltage (V) | 0x0000 | uint16 | ×0.01 | | Current (A) | 0x0001 | uint16 | ×0.01 | | Power (W) | 0x0002 | uint32 (little-endian) | ×0.01 | | Energy (kWh) | 0x0004 | uint32 (little-endian) | ×0.01 |
CT arrow pointing toward load → causes negative power.
Calibrate internal voltage offsets if your unit drifts over time.
Always house the patched unit inside a non-conductive, fire-retardant junction box.
Automate the energy reset function (kWh clearing) without pressing the physical button. Hardware Patching: Tapping the Serial Lines
The is a highly popular, robust 100A AC digital power meter. However, the factory documentation is notoriously sparse, often leaving makers and engineers scratching their heads regarding wire connections, calibration, and data interpretation.
Got a specific question about reading registers or setting alarms? Drop a comment below!
Identify the microchip driving the LCD display.
The is a high-precision 4-in-1 DC digital multi-function meter widely used in solar setups, battery banks, and electric vehicle monitoring. While the device is highly reliable, users often find the original documentation lacking clarity. This "patched" guide synthesizes instructions for calibration, advanced settings, and hardware modifications to help you get the most out of your meter. Core Specifications & Capabilities
Note: The unit remembers the backlight setting even after power loss. 2. Energy Data Reset
"Check wiring." (Unhelpful)
Ensure your load is pulling power through the "Load Side" of the shunt and not bypassing it directly to the battery negative terminal.
For the shunt, the large terminals accept cables up to 8 mm² (10 AWG) for the 50 A version, or up to 16 mm² (6 AWG) for the 100 A version.
The original manual provides an incomplete Modbus register table. Worse, some registers are swapped (e.g., Voltage and Current addresses are incorrectly labeled). Below is the for firmware version 2.1+ (most common as of 2024).