Xantrex Technology RC6 - Manual (Page 10)

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The purpose behind the three-stage charge process is to provide complete
recharging of the batteries without damage due to overcharging at too high a
current or voltage.
The bulk charging stage provides the battery with controlled constant current
charging and is the first step in the process. When the charger is in this stage the
Bulk Charge light on the RC6 will remain on solid.
During the Absorption Charge stage the Bulk Charge light will blink slowly.
This stage “tops off” the battery.
The float or maintenance charge stage trickle charges the battery while keeping it in
fully charged ready to go state. This stage is indicated on the RC6 by the Float Charge
light slowly flashing.
During the charge process the battery voltage and current being fed into the battery
may be monitored on the RC6 voltage and amp meters as discussed previously.
"
The float
charge light
means the
battery is fully
charged and
ready for use.