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electrical:solar:shallow_cycling [2017/11/09 19:07] frater_secessus [how it works] |
electrical:solar:shallow_cycling [2018/01/27 02:13] frater_secessus [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, simple, space-efficient, and inexpensive solar configuration that may be of use to cardwellers or minimalist vandwellers. |
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Most of the RV world is familiar with deep-cycle 12v systems; these are intended to store power for use overnight. If most power is only needed in the daytime then deep-cycle batteries are not required. | 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. |
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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)) | 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)) |
==== how it works ==== | ==== how it works ==== |
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- a simple [[electrical:solar:charge_controllers#shunt_controller|shunt charge controller]] holds the battery at a mild Absorption voltage (14.0, - 14.2v) when charging, just below the gassing point | - a simple [[electrical:solar:charge_controller#shunt_controller|shunt charge controller]] holds the battery at a mild Absorption voltage (14.0, - 14.2v) when charging, just below the gassing point |
- the controller's LOAD output disconnects (LVD) at 100% SoC (~12.7v) | - 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); see discussion below |