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electrical:solar:charge_controller_setpoints

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electrical:solar:charge_controller_setpoints [2020/01/13 08:05]
frater_secessus [Solar charge controller setpoints]
electrical:solar:charge_controller_setpoints [2020/05/23 11:41]
frater_secessus [charging setpoints]
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 [[electrical:​solar:​charge_controller|Solar charge controller]],​ [[electrical:​converter|converter]],​ and [[electrical:​12v:​b2b|DC-DC]] charging behavior is guided by //​setpoints//,​ which are settings stored in the controller. ​ They may or may not be configurable by the user.  [[electrical:​solar:​charge_controller|Solar charge controller]],​ [[electrical:​converter|converter]],​ and [[electrical:​12v:​b2b|DC-DC]] charging behavior is guided by //​setpoints//,​ which are settings stored in the controller. ​ They may or may not be configurable by the user. 
  
-The two most important setpoints for battery life and performance are charging voltages: ​ Absorption voltage and Float voltage, discussed below. ​+The two most important setpoints for battery life and performance are charging voltages:  ​//Absorption voltage// and **Float voltage**, discussed below. ​
  
  
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   * **Absorption voltage (Vabs)** - the voltage the battery bank is held at until [[electrical:​12v:​charging#​absorption_stage|Absorption stage]]((sometimes confusingly called "​boost"​ stage)) is //​completed//​. In this case the recommendation is 14.4v. ​ //​Completed//​ absorption means your lead batteries are fully charged.((the controller being in Float does //not// necessarily mean the batteries were fully charged; controllers can drop to Float too early due to bad design, incorrect battery chemistry switches, or incorrectly-configured setpoints.)) ​   ​   * **Absorption voltage (Vabs)** - the voltage the battery bank is held at until [[electrical:​12v:​charging#​absorption_stage|Absorption stage]]((sometimes confusingly called "​boost"​ stage)) is //​completed//​. In this case the recommendation is 14.4v. ​ //​Completed//​ absorption means your lead batteries are fully charged.((the controller being in Float does //not// necessarily mean the batteries were fully charged; controllers can drop to Float too early due to bad design, incorrect battery chemistry switches, or incorrectly-configured setpoints.)) ​   ​
   * **Float voltage (Vfloat)** - the voltage the battery bank is held at during [[electrical:​12v:​charging#​float_stage|Float]]. ​ In this case the recommendation is 13.5v.   * **Float voltage (Vfloat)** - the voltage the battery bank is held at during [[electrical:​12v:​charging#​float_stage|Float]]. ​ In this case the recommendation is 13.5v.
 +  * **Equalization voltage (Vequal)** - the voltage the battery bank is held at during [[electrical:​12v:​charging#​equalization|Equalization]]. ​ In this case the recommendation is 15v+.
   * **Temperature compensation** - how the voltage setpoints are [[electrical:​12v:​charging#​temperature_compensation|adjusted for temperature]]. ​ While this is sometimes configurable,​ the compensation factor is close enough between manufacturers that it is often left at the default. ​   * **Temperature compensation** - how the voltage setpoints are [[electrical:​12v:​charging#​temperature_compensation|adjusted for temperature]]. ​ While this is sometimes configurable,​ the compensation factor is close enough between manufacturers that it is often left at the default. ​
   * **endAmps** - the amount of current (or percentage of capacity) accepted by the battery in late Absorption that indicates it's appropriate to Float. ​ In the lower-right of [[https://​www.trojanbattery.com/​pdf/​Trojan_QSG_AGM.pdf|this graph]] Trojan shows it as [[electrical:​12v:​battery_capacity|C]]/​200:​((actually C/20/200, but C/200 here for simplicity)) ​ Also see **absorption duration** below.   * **endAmps** - the amount of current (or percentage of capacity) accepted by the battery in late Absorption that indicates it's appropriate to Float. ​ In the lower-right of [[https://​www.trojanbattery.com/​pdf/​Trojan_QSG_AGM.pdf|this graph]] Trojan shows it as [[electrical:​12v:​battery_capacity|C]]/​200:​((actually C/20/200, but C/200 here for simplicity)) ​ Also see **absorption duration** below.
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   * **Absorption duration** - the amount of time Vabs will be held until dropping to Vfloat. ​ May be used instead of or in addition to any endAmps above. ​ endAmps is more precise but can be tricky to measure, as [[electrical:​12v:​loads|loads]] or [[electrical:​12v:​multipoint_charging|multiple controllers]] can obscure the true level of current being accepted by the battery.   * **Absorption duration** - the amount of time Vabs will be held until dropping to Vfloat. ​ May be used instead of or in addition to any endAmps above. ​ endAmps is more precise but can be tricky to measure, as [[electrical:​12v:​loads|loads]] or [[electrical:​12v:​multipoint_charging|multiple controllers]] can obscure the true level of current being accepted by the battery.
   * **Absorption restart** - voltage (or duration) at which Absorption stage after failing to maintain Vfloat   * **Absorption restart** - voltage (or duration) at which Absorption stage after failing to maintain Vfloat
 +  * **Equalization duration** - the amount of time the controller will hold Vequal.
  
 ===== load setpoints ===== ===== load setpoints =====
electrical/solar/charge_controller_setpoints.txt ยท Last modified: 2020/05/23 11:42 by frater_secessus