Xantrex Technology 300 - Manual (Page 23)

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3. Insert the plug into the Charger Input Socket and place the
solar panel in the sun. xPower300 will charge automatically just
as with the AC Charger. (See Section 7 - Recharging with the
AC Charger.) A 3 amp solar panel will charge xPower300 in
about 8 hours in direct sunlight.
Figure 3 - Typical DC Coaxial Connector Connection