OPERATION
Copyright Trace Engineering Company, Inc.
5916 - 195th Street N.E.
Arlington, WA 98223
Telephone: 360/435-8826
Fax: 360/435-2229
www.traceengineering.com
PS Series Inverter/Charger
Part No. 3597
Rev. D: November 23, 1999
Page
89
ENERGY MANAGEMENT MODES
The purpose of these modes is to manage how utility power is used. There is three possible ways this
can be accomplished. TIME OF DAY METERING MODE is used to shift the time at which utility power is
used -charge the batteries at a favorable time and then use the power later, PEAK LOAD SHAVING
MODE is to limit the maximum draw the AC loads place on the utility and LOW BATTERY TRANSFER
MODE allows you to operate your loads from an alternative power source and use the utility as a back-up
source.
To operate the system in any of the Energy Management Modes, set up the system as follows:
Note: All adjustments require the SWRC.
• Connect utility AC power to the inverter’s AC HOT IN and AC NEUTRAL IN terminals.
• Connect AC loads to the inverter’s AC HOT OUT and AC NEUTRAL OUT terminals.
• Set the ‘MAXIMUM AC AMPS IN’ switch to the AC1 position.
• Adjust the GRID (AC1) AMPS AC menu item to match the amperage of the circuit breaker supplying
AC to the inverter input. This setting is located in the AC INPUTS (11) menu heading – (See UTILITY
SUPPORT/OVERLOAD PROTECTION on page 81).
TIME OF DAY METERING MODE
This mode is often desirable when time of day metering is available. An external source of power (wind,
hydro or wind) is not required, but can be used to reduce the discharging of the battery. Since the most
expensive power is often during the afternoon, the solar array may be a valuable addition. This mode is
an alternative to utility inter-active systems. This mode does not involve “selling” power into the utility grid
and therefore does not usually require the approval of the utility. The same system is also able to operate
as a utility back-up system to provide power when an outage occurs.
In order to disconnect from grid during a specific period of the day and operate only as an inverter, a
window of time is created in which battery charging is allowed. Outside of this window, the inverter will
power the load from the battery. If the battery gets low, the system will transfer back to the utility and
prevent the battery from discharging.
The following additional settings allow for this mode of operation:
• SET GRID USAGE MODE menu item is set to FLT. This is located under the INVERTER SETUP (9)
menu heading in the SETUP menu.
• SET START CHARGE TIME menu item under the GRID USAGE TIMER (18) menu heading is set to
the time the inverter connects to the utility. This is the beginning of the time the battery charger is
allowed to operate and the end of the inverter operating period.
AC LOADS
INVERTER/
CHARGER
UTILITY GRID AC
BATTERY
AC
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