Hello and greetings.
First off, I would like to thank you for receiving our newsletter, but since it has been an extended period of
time since it has been distributed, I want to call your attention to the OPT OUT option at the bottom of the page, if you are no longer interested, I certainly understand. !!
This issue reports on a couple of new products and gives a sneak preview of a the WattNode Cloud product to be released next month.
ACT Series Current Transformers
250, 400, and 600 Amp
I am thrilled to report the success of the new ACT-1250 Series current transformer that we now have available, The ACT-0750 and the new ACT-1250 provide revenue-grade current measurement for loads <5 amps – 600 amps.
WattNode Revenue Modbus Meter
The solar market has taken us by storm. We have been promoting the Revenue-Grade meter and high accuracy ACT Series current transformers for PV production and consumption measurements. The bi-directional capability of the WattNode® meter offers an affordable, compact and easy to install solution to nearly any PV system.
WattNode Modbus Meter Module
Continental Control Systems has developed a energy meter module which is an OEM targeted energy meter on a board designed to be mass produced with the specific features required by the OEM. The bidirectional meter module communicates via RS-485 to the existing gateway or controller and is instrument powered by a 4-30 volts AC/DC source. The single board provides the complete bi-directional multi-measurement functionality of the WattNode® Revenue. The board accommodates either a single or multi-phase service with either board-mounted or externally mounted CTs. Stay tuned for more information.
And …… to be announced and featured this upcoming month at both the WEEC and NECA Expos – the new
WattNode Cloud provides both real-time and historic power and energy monitoring, control and logging. Data is available through a local display as well as through any Ethernet or wireless / cellular device. TheWattNode Cloud can be expanded to add multiple energy modules, thermostats, and other sensors. Stay tuned for more information
For more information about any of these products, please visit our website at www.ctlsys.com
Once again, we thank you for your business and look forward to working with you for the remainder of the year.
Owners of buildings with photovoltaic (PV) energy production systems typically install their own electric meter in parallel with the utility company’s billing meter. This allows the owner to independently measure in real-time their energy production or consumption.
Energy consumed from the grid and energy produced from the PV system can be measured depending on the location in the electrical system where the current transformers (CTs) are installed. When CTs are installed on the load side of the main breaker, kWh consumption can be measured. If the meter is capable of measuring both positive (consumed) and negative (produced) energy, like a WattNode meter, it can function as a bidirectional net meter.
In a net meter, the kWh energy register value increases as energy is consumed from the grid and decrease (runs backwards) when the PV system produces more energy than the building consumes. If the PV system continues to produce more energy than the building consumes, the kWh energy register value will continue to decrease. When the register reaches zero, the sign changes to minus to indicate negative energy and the value starts increasing. The negative value will continue increasing as long as energy production exceeds consumption.
Some companies in the solar industry are moving away from the “net meter” terminology towards the terms Consumption: Line-Side PV System and Consumption: Load-Side PV System. In a Line Side PV System, the inverter feeds power into the grid ahead of the main service breaker and upstream of CTs. In this arrangement, the meter can only measure consumption. In a Load-Side PV System, the inverter feeds power into the breaker panel downstream of the CTs. In this arrangement, the meter can measure positive, negative, and net energy depending on which energy register is used.
For production metering, the CTs are installed on the output conductors of the inverter ahead of where they connect to the electrical service. Typically, the easiest location to install the CTs and meter is at the breaker panel where the inverter conductors connect to the back feed breaker.
|John Browne 720-287-8431
or 303-444-7422 X431