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--- electrical:solar:status [2019/11/12 12:34]
frater_secessus [in absorption]
+++ electrical:solar:status [2020/08/29 22:28]
frater_secessus [in float]
@@ Line 80: / Line 80: @@
-**During [[electrical:12v:charging#absorption#absorption_stage|Absorption]] charging with MPPT** the battery will need less and less current.
+**During [[electrical:12v:charging#absorption#absorption_stage|Absorption]] charging** lead-acid batteries will need less and less current.
+**with MPPT controllers**
   * Vpanel starts to creep up from Vmp toward Voc
   * Vbatt == Vabs until the controller's criteria for ending absorption is met
@@ Line 86: / Line 89: @@
   * **Example:**  Panel voltage 17v and rising, battery voltage held at Vabs == 14.6v, controller output amps 2A and dropping
-**During Absorption charging with PWM**
+**with PWM controllers**
   * Vpanel & Vbattery == Vabs until the controller's criteria for ending absorption is met
   * Controller output decreasing as current demand drops.
   * the controller may get warmer as current demand drops((percentage of time the PWM circuit is turned OFF increases))
   * **Example:**  Panel and battery voltage held at Vabs == 14.6v, controller output 2A and dropping
+==== transitioning to float ====
+When transitioning from Absorption to Float the voltage needs to drop about a volt.  The system will "free-fall" (make little or no power) to allow the voltage to fall.  The transition may take seconds or minutes, depending on how/if the system is loaded.
+  * starts at Vabs
+  * power generation stops
+  * voltage drops to Vfloat
+  * when voltage reaches Vfloat the system will start making power to hold that setpoint.
 ==== in float ====

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