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--- electrical:solar:charge_controller [2019/09/02 23:53]
frater_secessus [shunt] holding Vans all day
+++ electrical:solar:charge_controller [2019/09/28 17:17]
frater_secessus [MPPT]
@@ Line 24: / Line 24: @@
 {{ https://media.licdn.com/mpr/mpr/AAEAAQAAAAAAAAwtAAAAJGJhNjE1OGY3LTM3OWQtNGQ2Mi05NWEwLTI2Mzc3MGY3MDk3MA.png?150}}When compared apples-to-apples on identical systems with //only the controller being different//, the "boost" effect is most pronounced:
   * during bulk stage and the early part of absorption stage when the battery can take in the most power
+  * anytime the system is fully loaded down (charging and/or loads)
   * when the battery is most depleted (ie lowest resting voltage).  This is the result of a cascade of factors:
-    * When a battery is deeply discharged it will go into Bulk charging mode until it reaches the Absorption voltage (Vabs).  For the purpose of illustration we will assume the bank is depleted to 12.2v (~50% [[electrical:depth_of_discharge|state of charge]]), a commonly recommended lower limit for deep cycle batteries.
+      * When a battery is deeply discharged it will go into Bulk charging mode until it reaches the Absorption voltage (Vabs).  For the purpose of illustration we will assume the bank is depleted to 12.2v (~50% [[electrical:depth_of_discharge|state of charge]]), a commonly recommended lower limit for deep cycle batteries.
-    * PWM controllers can only run the panel at whatever voltage they are charging at right now.  In our example that is 12.2v.
+      * PWM controllers can only run the panel at whatever voltage they are charging at right now.  In our example that is 12.2v.
-    * Nominal 12v panels usually have max power output (Vmp) around 17v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))
+      * Nominal 12v panels usually have max power output (Vmp) around 17v.((https://www.altestore.com/howto/solar-panels-pv-and-voltages-a98/))
-    * when a typical 100w panel((Iop = 5.6A)) is run at 12.2v in lab conditions it puts out **~68.32W**. The same panel run at Vmp (~17v) would put out **100W**.  **MPPT is capturing more power than the PWM when the battery needs it most**.((there are minor inefficiencies not considered here))
+      * when a typical 100w panel((Iop = 5.6A)) is run at 12.2v in lab conditions it puts out **~68.32W**. The same panel run at Vmp (~17v) would put out **100W**.  **MPPT is capturing more power than the PWM when the battery needs it most**.((there are minor inefficiencies not considered here))
   * during times of greatest PV efficiency((i.e. highest voltage)) (clear, cold weather)
   * during times of low irradience (low light levels due to low angle or overcast conditions)((this is a function of higher input voltages))((https://www.victronenergy.com/upload/documents/White-paper-Which-solar-charge-controller-PWM-or-MPPT.pdf Section 7.3))

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