Xantrex Technology STXR1500, STXR2500 Checking the AC Utility Voltage, To check the AC utility voltage:

Startup Procedure

> 50 VDC

ACDC

VOLTS VOLTS

+–

Figure 3-1 PV array DC voltage test

Checking the AC Utility Voltage

Note: The Sun Tie XR is designed primarily for residential applications. For commercial applications where only 208 VAC is available, the Sun Tie XR may be installed with the appropriate use of a buck-boost transformer.

To check the AC utility voltage:

1.Switch on the main 240 V breakers in the building’s electrical service panel.

2.Ensure all circuit breakers located in the Sun Tie XR unit are in the off (down) position.

3.Using an AC voltmeter, measure the AC open circuit utility voltage between L1 and L2, as shown in Figure 3-2. Ensure this voltage is approximately 240 volts AC. The inverter operates with a line-to-line voltage (L1 to L2) ranging from 211–264 volts AC.

4.Switch on the ganged 15 amp Sun Tie XR circuit breakers located in the main electrical service panel. This applies the utility-supplied 240 volts AC to the Sun Tie XR unit.

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