07-03-2025, 03:24 PM
Ok below is my conclusion from support conversation:
* Power (W) Readings: When compared to a Shelly EM on the exact same circuit, the M30's readings are off by as much as 100%.
* Energy (kWh) Accumulation: The total energy counter randomly jumps by 1 kWh and fails to accumulate energy usage correctly.
* Calculation Mismatch: There is a significant discrepancy between the power reported by the device and the power calculated manually (Current x Voltage). For example: 0.614A * 235V should be ~144W, but the device reported only 1.4W.
Phase 1: Testing with the Original M30 Board
Initially, I tested the M30 with various loads, from a few milliamps to 10 amps. I used both a recommended YHDC SCT-013 clamp and another one from AliExpress. The results were consistently wrong with both. I also tried different firmware, including the KCS version, without any improvement.
Here is a sample of the initial measurements taken with the original M30 and original clamps:
* Under Load:
* Shelly EM: 528W
* Kincony M30 (with YHDC clamp): 357W
* Without Significant Load:
* Shelly EM: 188W
* Kincony M30 (with YHDC clamp): 231W
Phase 2: Testing with Replacement Hardware
After contacting the seller, I received a brand new M30 board and a new 10A CT clamp. Unfortunately, the issue is exactly the same. The behavior remains:
* At low power usage, it reports 50-100% more than the actual value.
* At higher loads, it reports 80-100% less than the actual value.
I am attaching screenshots from my latest test, comparing the new M30 (using KCS firmware) with my Shelly EM.
* In the KCS screenshot, Power_1 is measured using my old 20A CT clamp.
* Power_2 is measured using the new 10A CT clamp that was sent with the replacement M30.
(Attach screenshots: "Screen Shot 2025-05-29 at 08.26.57.png" and "Screenshot_20250529-082708.png")
Given that the problem persists across two different M30 units and three different CT clamps, I am at a loss.
![[Image: Screenshot-20250529-082708.png]](https://i.ibb.co/Qvns1zWJ/Screenshot-20250529-082708.png)
![[Image: Screen-Shot-2025-05-29-at-08-26-57.png]](https://i.ibb.co/zV9jd40C/Screen-Shot-2025-05-29-at-08-26-57.png)
Could you please clarify how these readings could be accurate? If you’re certain that another clamp is required, please provide one, as I have already received a clamp from the seller in accordance with the service department’s instructions.
* Power (W) Readings: When compared to a Shelly EM on the exact same circuit, the M30's readings are off by as much as 100%.
* Energy (kWh) Accumulation: The total energy counter randomly jumps by 1 kWh and fails to accumulate energy usage correctly.
* Calculation Mismatch: There is a significant discrepancy between the power reported by the device and the power calculated manually (Current x Voltage). For example: 0.614A * 235V should be ~144W, but the device reported only 1.4W.
Phase 1: Testing with the Original M30 Board
Initially, I tested the M30 with various loads, from a few milliamps to 10 amps. I used both a recommended YHDC SCT-013 clamp and another one from AliExpress. The results were consistently wrong with both. I also tried different firmware, including the KCS version, without any improvement.
Here is a sample of the initial measurements taken with the original M30 and original clamps:
* Under Load:
* Shelly EM: 528W
* Kincony M30 (with YHDC clamp): 357W
* Without Significant Load:
* Shelly EM: 188W
* Kincony M30 (with YHDC clamp): 231W
Phase 2: Testing with Replacement Hardware
After contacting the seller, I received a brand new M30 board and a new 10A CT clamp. Unfortunately, the issue is exactly the same. The behavior remains:
* At low power usage, it reports 50-100% more than the actual value.
* At higher loads, it reports 80-100% less than the actual value.
I am attaching screenshots from my latest test, comparing the new M30 (using KCS firmware) with my Shelly EM.
* In the KCS screenshot, Power_1 is measured using my old 20A CT clamp.
* Power_2 is measured using the new 10A CT clamp that was sent with the replacement M30.
(Attach screenshots: "Screen Shot 2025-05-29 at 08.26.57.png" and "Screenshot_20250529-082708.png")
Given that the problem persists across two different M30 units and three different CT clamps, I am at a loss.
Could you please clarify how these readings could be accurate? If you’re certain that another clamp is required, please provide one, as I have already received a clamp from the seller in accordance with the service department’s instructions.