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--- electrical:solar:charge_controller [2018/08/26 09:58]
frater_secessus [multiple charge controllers]
+++ electrical:solar:charge_controller [2019/04/11 19:49]
frater_secessus [shunt]
@@ Line 29: / Line 29: @@
   - DC-DC downconvert excess voltage to amps
-During Bulk phase when maximum power is required((or at other time when loads + charging >= panel output)) the controller will run the panels at Vmp (the maximum power point).   At other times the controller will find a less-than-maximum power point to match panel output to system needs.
+When maximum power is required((in Bulk or at other time when loads + charging >= panel output)) the controller will run the panels at Vmp (the maximum power point).   At other times the controller will find a less-than-maximum power point to match panel output to system needs.
 [[http://amzn.to/2yP01Ob|{{https://images-na.ssl-images-amazon.com/images/I/512x3hbc6jL._AC_US160_.jpg }}]]
@@ Line 49: / Line 49: @@
   * 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))
-=== designing for MPPT ===
+There are some considerations when [[electrical:solar:mppt design|designing a system around an MPPT controller]].
-There are benefits from using [[electrical:solar:panels#panel_voltage|higher voltage panels]] that can be realized when a system is designed for an MPPT controller.  An MPPT controller can be the centerpiece of [[electrical:converter#diy_converters|a DIY converter]].
-MPPT controllers are most efficient when input voltage (Vpanel) is about 2x nominal battery voltage (Vbatt).  When Vpanel rises above 2x Vbatt more heat is generated when downconverting.((https://www.homepower.com/input-voltage-controller-efficiency))  At less than 2x the controller may not have enough "headroom" to work efficiently.
 ==== shunt  ====
 [[http://amzn.to/2yQppTX|{{ https://images-na.ssl-images-amazon.com/images/I/41Gwyw0BT5L._AC_US160_.jpg}}]]
-Shunt controllers are very simple devices that charge to a given voltage [[electrical:solar:charge_controller_setpoints|setpoint]] (Vdisconnect) then stop charging.  If/when voltage falls to some lower voltage (Vreconnect) charging begins again.  This is sometimes called [[electrical:12v:charging#charge-and-stop|charge and stop charging]].
+Shunt controllers are very simple devices that charge to a given voltage [[electrical:solar:charge_controller_setpoints|setpoint]] (Vdisconnect) then stop charging.  If/when voltage falls to some lower voltage (Vreconnect) charging begins again.  This is sometimes called [[electrical:12v:charging#charge-and-stop|charge and stop charging]] or on/off charging.
 > ...PWM [and] shunt controllers apply full panel voltage, or something close to it, across the battery terminals, at a duty cycle (fast for PWM, slow for shunt) that keeps the battery happy, and the controller monitors the battery voltage and then adjusts the PWM duty cycle accordingly, or in the case of a shunt, it clamps the panel output. -- Tx2Sturgis((http://www.cheaprvliving.com/forums/showthread.php?tid=29896&pid=373640#pid373640))

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