Electricity use monitored using wireless zigbee technology.

In The Business Of Designing & Manufacturing Energy Consumption Monitors !

Here is how the ECM-1220.H works!

Where the ECM-1220.H gets the Power information.

How the Power is measured.

What the ECM-1220.H does with the energy information

Where the ECM-1220.H gets the Power information:

From the Power Company
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WARNING:

Installation of CTs must be performed by an electrician or qualified person. All local codes must be obeyed.

The electricity first passes through the house meter to record the amount of power used by the consumer.
The electricity is then passed on to the service panel.
The ECM-1220.H installation requires the addition of two current sensors snapped around the two main conductors at the panel. From the service panel, the electricity is distributed throughout the building to power appliances and loads. The ECM-1220.H uses a step-down wall transformer plugged into a local receptacle to sample the voltage.

As shown above the ECM-1220.H acquires the current at the panel using two accurate split-core current transformers (CT). The voltage is accessed using a local receptacle and stepping down the voltage for metering.

How the Power is measured:

The power company charges the consumer for "true power" also called "real power" used.

In order to properly calculate the "true power", both the voltage and current must be sampled in real time. The ECM-1220.H does this by reading the current using two current transformers (CT) and the voltage using a step down potential transformer (PT).

With these values, the ECM-1220.H calculates the power for each of the two panel phases independently, by taking thousands of samples of these values every second.

The ECM-1220.H measures "true" power (also called "real" power) which takes the effect of power factor into account!

BEWARE: There are some "energy monitors" on the market claiming to display the cost of electricity. Some of these devices only read the current and calculates the cost of electricity based on the current alone. THIS IS FALSE INFORMATION. The error will always be in favour of displaying a higher consumption (cost) than the actual.

In the case of a load with a "power factor" of "0.5" these monitors will report that you are using twice the actual amount. Someone using this type of monitor could possibly end up replacing a refrigerator, thinking that it is too expensive to operate!

What the ECM-1220.H does with the energy information:

Once the "true power" has been calculated, the ECM-1220.H can then accumulate a kilowatt-hour value. This is the amount of power used over a period of time. With this data, the ECM-1220.H performs three main tasks:

1. Displays the information on its modern "blue backlit" LCD display.

Makes this information and all of it relevant calculated data available for display; power (watts), energy (kwh), cost of energy used ($), rate of consumption ($/hr), projected daily, weekly, monthly cost or energy ($) or (kwh) and more.

2. Stores the information to its non-volatile memory.

Holds the value of all samples and when the "Storage Interval" time has elapsed, stores the average of all samples to it non-volatile data logger memory. This data may be downloaded to a computer for analysis once the monitoring session is completed.

3. Sends updated data to a computer every second.

The data is available at the USB port or wirelessly (optional) for monitoring using a computer. This information is updated every second, providing an extremely hi data resolution.