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--- electrical:solar:shallow_cycling [2020/07/08 15:48]
frater_secessus [single voltage charging]
+++ electrical:solar:shallow_cycling [2020/11/30 18:05]
frater_secessus [components]
@@ Line 3: / Line 3: @@
 ====== microsolar without deep-cycle batteries ======
-This article describes a small, simple, space-efficient, and inexpensive solar configuration that may be of use to cardwellers or minimalist vandwellers.
+This article describes a small, cheap, simple, space-efficient solar configuration that may be of use to cardwellers or minimalist vandwellers.  Benefits:
-Most of the RV world is familiar with [[electrical:12v:deep_cycle_battery|deep-cycle 12v systems]];  these are intended to store power for use overnight.  If most power is consumed [[electrical:solar:nonessential|in the daytime when the system has excess power]] then deep-cycle batteries may not be required.
+* provides 12v power during daylight
+* will never deplete the starter battery so you get stranded
-Instead of deep-cycling, the starter battery is //non-cycled//((never discharged below 100% state of charge)) as described below.  It can also be [[electrical:solar:shallow_cycling#shallow-cycling|shallow-cycled]].((discharged to 90% state of charge))
+* actively maintains the starter battery
+Instead of deep-cycling like someone might in an RV, the idea here is the starter battery can be used but never dragged below 100% state of charge)).
@@ Line 21: / Line 22: @@
 ==== how it works ====
-  - a simple [[electrical:solar:charge_controller#shunt|shunt charge controller]] holds the battery at a mild Absorption voltage (14.0, - 14.2v, see notes [[electrical:solar:shallow_cycling#charging_voltages_and_starter_batteries|below]]) when charging, just below the significant gassing point
+  - a simple [[electrical:solar:charge_controller#shunt|shunt charge controller]] holds the starter battery at a medium Float voltage (13.2 - 13.8v, see notes [[electrical:solar:shallow_cycling#charging_voltages_and_starter_batteries|below]]) when charging, this is below the gassing point
   - the controller's LOAD output disconnects (LVD) at 100% SoC (~12.7v)
-  - the controller's LOAD output //re//connects (LVR) at ~13.0v);  see discussion below
+  - the controller's LOAD output //re//connects (LVR) at ~13.0v)
-  - power is //only// taken from the controller's LOAD output;((or from a circuit control by a relay on the LOAD output)) this ensures the starter battery is never discharged below [[electrical:12v:lvd|the intended setpoint]]
+  - power is //only// taken from the controller's LOAD output;((or from a circuit control by a relay on the LOAD output)) this ensures the starter battery is never discharged below [[electrical:12v:lvd|the intended setpoint]].  Since the load is disconnected below 12.7v the battery cannot be run down by loads.
 === Low Voltage Reconnect (LVR) setpoint ===
@@ Line 35: / Line 36: @@
-==== components ====
-  * vehicle with starter battery
-  * simple [[http://amzn.to/2z8Sd8Y|10A controller **with configurable setpoints**]].  The controller should be mounted in a location easy for easy access if the built-in USB ports are going to be used.
-  * small solar panel; 25w-100W would be fine.
-  * connector of some kind if panel is mounted off-vehicle
-  * wiring from panel to controller and from controller to starter battery
-  * [[http://amzn.to/2xHjBi7|usb/12v power outlet]].  An outlet with USB ports in it would allow the controller itself to be mounted discreetly and closer to the battery.

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