Xantrex Technology SW Series Peak Load Shaving Mode, In Brief, Page 92, Operation, Utility Grid

OPERATION

PEAK LOAD SHAVING MODE

UTILITY GRID AC

IN BRIEF

INVERTER/ CHARGER

DC

BATTERY

AC AC LOADS

The inverter can also be used to limit the maximum draw the AC loads place on the utility grid. Many utilities impose a surcharge on their customers based on the peak load used by a facility. The SW Series Inverter/Charger can be configured to provide all of the power above a specified level, eliminating the surcharges. With the Control Panel, simply adjust the SET GRID (AC1) AMPS AC menu item to the maximum value allowed by the utility without the peak load surcharge. All AC loads must be connected to the output of the inverter through the 60-amp AC transfer relay located internally. Multiple inverters may be required for larger applications with individual groups of loads connected to each inverter. This can be used in addition to time of day metering and still allows the inverter to provide a utility back-up function in addition.

This mode is also useful for applications where AC loads require more power than a utility connection is able to supply. This often occurs in mobile applications where only a 15-amp outlet may be available. The inverter can provide the excess power above the 15 amps when the load is operating. If this condition occurs intermittently, then the inverter will be able to recharge the batteries between the heavy load periods. This can eliminate the need to increase the size of a utility supply circuit, providing substantial savings that can offset the cost of the inverter.

This mode is used in some vehicle applications to improve the power quality by reducing the load placed on the AC line cord. The inverter provides the “start-up” power to eliminate brown out problems experienced when starting air conditioners, etc. This also prevents tripping AC source circuit breakers when heavy loads are operating.

Page

92

 2001 Xantrex Technology, Inc.	Telephone: 360/435-8826	SW Series Inverter/Charger
5916 - 195th Street N. E.	Fax: 360/435-2229	Part No. 2031-5
Arlington, WA 98223	www.traceengineering.com	Rev. C: February 2001