Xantrex Technology SW Series Battery Temperature Sensor Bts, Charger Only Operation, Page 65

OPERATION

BATTERY TEMPERATURE SENSOR (BTS)

Figure 22, BTS (Battery Temperature Sensor)

A plug-in external Battery Temperature Sensor (BTS), which is provided, automatically fine-tunes the charging process of the battery charger in relation to temperature. When the temperature sensor is installed, the charge voltage is adjusted either higher or lower than the BULK and FLOAT setpoints based on temperature. The BATTERY TEMP COMP VOLTS DC menu item under the METERS (4) menu heading shows this adjusted charge voltage.

If the temperature sensor is NOT installed and if the battery is subjected to large temperature variations, a shorter battery life cycle may be expected.

Install the BTS on the side of the battery below the electrolyte level. It is best if the sensor is placed between batteries and if the batteries are placed in an insulated box to reduce the influence of the ambient temperature outside the battery enclosure. Ventilate the battery box at the highest point to prevent hydrogen accumulation.

The BTS provided may be extended beyond the standard 15 feet by an additional 20 feet using standard telephone cables with RJ-11 plugs.

CHARGER ONLY OPERATION

When the CHG mode is selected, the inverter will operate only as a charger. This is useful for unattended operation where a power failure might allow the inverter to drain the batteries by powering an AC load unnecessarily. To allow the Charger Only mode, FLT must be selected from the SET GRID USAGE menu item under the INVERTER SETUP (9) menu heading in the SETUP MENU (FLT is the factory default setting).

This feature is commonly used in marine applications where the inverter operates a refrigeration system from the batteries. Normally, the engine’s alternators keep the batteries charged. When docked, a shore cord is connected to the inverter to power the battery charger and run the refrigerator.

AC INPUT REQUIREMENTS

When an AC source is applied to the AC input, the AC1 IN GOOD or AC2 IN GOOD LED indicator will blink slowly once the AC voltage has been detected. If the AC source is acceptable, the inverter will synchronize to it after a delay period has passed. Once synchronized, the inverter will close an internal relay, connecting the AC source to the AC loads, indicated by the green AC IN GOOD LED (ON solid), and begin charging the batteries, indicated by the orange BULK LED (ON solid).

The AC source, connected to the inverter’s AC HOT IN 1 and AC HOT IN 2 terminals, is used to power both the battery charger and the AC loads while the inverter is in the battery charger mode. There are several settings, listed below, that involve the AC INPUT. See the USER SETTINGS WORKSHEET on page 123 for factory default settings.

INPUT AC VOLTAGE

The AC HOT IN 1 and AC HOT IN 2 inputs share the same upper and lower limits for restricting connection to an acceptable AC voltage operating window.

The AC input voltage window is typically set to the minimum / maximum range that the AC loads can tolerate - the inverter itself can operate over an extremely wide voltage range. The upper and lower settings are adjustable with the Control Panel and are located under the AC INPUTS (11) menu heading in the SETUP MENU.

 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

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