Both sides previous revision
Previous revision
Next revision
|
Previous revision
Next revision
Both sides next revision
|
electrical:solar:shallow_cycling [2018/06/16 20:48] frater_secessus [non-cycling] |
electrical:solar:shallow_cycling [2020/01/14 15:58] frater_secessus [sample build] |
==== how it works ==== | ==== how it works ==== |
| |
- 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]] |
| |
=== Low Voltage Reconnect (LVR) setpoint === | === Low Voltage Reconnect (LVR) setpoint === |
===== shallow-cycling ===== | ===== shallow-cycling ===== |
| |
//Shallow-cycling// is a more aggressive approach, allowing for a bit of power after sundown. It is most **suitable for starter batteries with removable cell caps**. | //Shallow-cycling// is a more aggressive approach, allowing for more power in the daytime and some power for use after sundown. It is most **suitable for starter batteries with removable cell caps**. |
| |
The charging setpoint is set somewhat higher, ~14.4v. This will result in minor outgassing and a bit more power (**76.18W** using the panel data above). [[electrical:12v:charging#watering_batteries|Battery watering]] is mandatory. | The charging setpoint is set somewhat higher, ~14.4v. This will result in minor outgassing and a bit more power (**76.18W** using the panel data above). [[electrical:12v:charging#watering_batteries|Battery watering]] is mandatory. |
| |
| |
| 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/)) |
| |
| ===== sample build ===== |
| |
| Total cost, ~$140. |
| |
| |
| * 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 [[https://amzn.to/2snWQOL|rack-mounted framed panel]] that fits rack dimensions or a [[https://amzn.to/30rmAGD|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)) and into the PANEL terminals of a [[electrical:solar:shunt_tweaking|$10 shunt]] solar [[electrical:solar:charge_controller|charge controller]] mounted in the footwell or elsewhere |
| * [[https://amzn.to/2RhbHmD|wire]] run from controller's BATTERY terminals to the starter battery. |
| * wire run from controller's LOAD terminals to [[https://amzn.to/3adk9vJ|12v/usb outlet]], power bus, etc |
| |