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electrical:solar:shallow_cycling [2018/06/16 20:51] frater_secessus [shallow-cycling] |
electrical:solar:shallow_cycling [2020/01/14 15:49] frater_secessus [sample build] |
==== how it works ==== | ==== how it works ==== |
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- 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 significant gassing point | - a simple [[electrical:solar:charge_controller#shunt|shunt charge controller]] holds the battery at a mild Absorption voltage (14.0, - 14.2v) when charging, just below the significant 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 |
- 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 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]] |
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=== Low Voltage Reconnect (LVR) setpoint === | === Low Voltage Reconnect (LVR) setpoint === |
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| Anecdote: TreborEnglish runs his 75A flooded 12v wally world deep cycle to 87% SoC regularly and it has lasted 3 years as of this writing. He reports it requires 20-30ml of water/month.((https://www.reddit.com/r/vandwellers/comments/enwq70/best_car_battery_for_van_life/fe670is/)) |
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| ===== sample build ===== |
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| * 100w poly((for least expensive and best performance with [[electrical:solar:shunt_tweaking|shunt]]/[[electrical:solar:pwm_tweaking|pwm [[electrical:solar:charge_controller|controllers]]]])) panel on the roof, either a rack-mounted framed panel or a flex panel adhered to the surface. |
| * [[https://amzn.to/2ToGWyX|cable gland]] for getting wires through roof |
| * panel wires runs down the vehicle A-pillar inside the passenger area -- can be on driver or passenger side depending on where starter battery is located |
| * wires run to a [[electrical:solar:shunt_tweaking|$10 shunt]] solar [[electrical:solar:charge_controller|charge controller]] |
| * controller's BATTERY wires run from the controller to the starter battery. |
| * controller's LOAD wires run to outlet, power bus, etc |
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