Xantrex Technology 175 PLUS - Manual (Page 18)

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Figure 4 shows the DC panel of the XPower 400 Plus and
XPower 700 Plus inverters.
Figure 4 DC Panel of XPower 400 Plus and XPower 700 Plus
Fan and Ventilation Openings: The cooling fan on the
XPower 400 Plus and XPower 700 Plus units are designed to
operate only when output power is greater than approximately
100 watts. When the inverter is turned on, the fan may operate
momentarily. The ventilation openings should not be covered at
any time the inverter is operating.
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