Xantrex Technology 120 VAC/60 owner manual Operation, Page

OPERATION

Once the system has transferred back to the battery, the battery voltage will continue to increase if the power from the alternative source exceeds the loads. This can result in the battery voltage reaching the HIGH BATTERY CUT OUT VDC setting unless a charge control device limits the battery voltage. Note that the LOW BATTERY CUT IN VDC setting must be set below the external charge controllers regulation setting or the system would never transfer back to the battery. The best compromise involves setting the BULK VOLTS DC equal to the FLOAT VOLTS DC default value, and setting the LOW BATTERY CUT IN VDC setting to the default BULK VOLTS DC setting. Make sure the external charge controller is set slightly higher than the LOW BATTERY CUT IN VDC setting so that the voltage can be reached without the charging source shutting off.

The LOW BATTERY TRANSFER VDC setting must be always set higher than the LOW BATTERY CUT OUT VDC setting. If utility back-up operation is expected, keep the LOW BATTERY TRANSFER VDC setting high to prevent excessive discharging of the battery. It should not be set to a level that is higher than the normal at rest battery voltage level or the system will transfer whenever no alternative power source is available (such as each night with solar). If the utility grid is not energized, the inverter will operate the AC loads until the battery voltage reaches the LOW BATTERY CUT OUT VDC setting. It will then shut off and only reset if the battery voltage reaches the LOW BATTERY CUT IN VDC level or the utility power becomes available again.

If time of day metering is available from your utility, you might consider the ENERGY MANAGEMENT MODE as it may offer a more economical way to operate the system.

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 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