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How to understand the time interval parameter in the Wi-Fi energy meter

This article will describe the "time interval" parameter concept in the Wi-Fi energy meter.

This parameter is easy to confuse because there are many "time interval" concepts in this product.

How to understand the "time interval" parameter in the Wi-Fi Energy meter

The Wi-Fi energy meter is consist of two basic parts, a metering module, and a Wi-Fi module, like the below pic.

Metering module: it is an ASIC, measures the electrical parameters (Voltage, current ,active power,power factor) at a very high sample frequency(Millisecond level). The kilowatt-hours (kWh) are also calculated by the metering module directly, the high sample rate makes sure the accuracy of the kwh data(Accuracy: class 1).

Wi-Fi Module: it requests data from the metering module and is responsible for the communication with the client.

Understand_the_sample_frequency_of_the_energy meter

The time interval concept in the Wi-Fi energy meter

No. Time intervals regards to value unit Remark
1 The time interval that the metering module sample the real load. Metering module Millisecond Independent of user application
2 request electrical parameters from the metering module Wi-Fi module 1 second fixed value
3 Request electrical parameters from the local API client 2 second The minimum is 2 seconds
4 Upload the electrical parameters to IAMMETER cloud client 60 second fixed value
5 Request electrical parameters from the modbus TCP client 1 second The minimum is 1 second
6 Upload the electrical parameters to customer`s own server client 12 second can be set by customer (12-1200)

When we use the Wi-Fi energy meter, we only need to pay attention to the time interval concept that regards to "client"

For example:

  1. when you need to control some device locally (such as charge or recharge the battery, or control some large load such as a heat pump ), you will need a fast response by the energy meter reading, then the Modbus/TCP would be a better option. You can refresh the electrical parameter every 1 second in the modbus/tcp mode, which is the fastest sample frequency in all options. How to use the modbus/tcp in the IAMMETER`s Wi-Fi Energy meter
  2. If you want to upload data to your own server (how to upload the energy data of Wi-Fi energy meter to the customes` own server by http, tls,tcp and mqtt), you can set the upload interval manually by a local API, the range is from 12 seconds to 1200 seconds(How to upgrade to the latest FW version and set the upload interval).
  3. if you just want to get the electrical parameters in the LAN, not very frequently. You can just use the local API, the minimum interval is 2 seconds. (Please note, that if you need more frequent data requests, do not recommend using the local API. Please use the Modbus/tcp when you need a frequent data request.)

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