Xantrex Technology 175 PLUS - Manual (Page 28)

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4. Fasten the positive (red) clip to the positive battery post, and
then fasten the negative (black) clip to the negative battery
post.
5. Turn on the front panel On/Off switch.
The green POWER light indicates that AC power is available
at the outlets and that the inverter is operating normally.
6. Plug in the AC loads you want to operate.
7. If you disconnect the battery, turn the inverter off first.