RVwiki for vanfolk and others who live in vehicles

User Tools

Site Tools

Trace:
electrical:12v:charging

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
electrical:12v:charging [2022/01/11 21:38]
princess_fluffypants 		electrical:12v:charging [2023/09/16 16:22] (current)
frater_secessus [Collected recommendations]
Line 46: Line 46:
 **Mythbuster**:  bulk charging lead banks with higher current does not necessarily [[opinion:frater_secessus:charging_faster|shorten overall charging time]].  Once minimum charge rates are met, fully charging takes roughly the same amount of time.   **Mythbuster**:  bulk charging lead banks with higher current does not necessarily [[opinion:frater_secessus:charging_faster|shorten overall charging time]].  Once minimum charge rates are met, fully charging takes roughly the same amount of time.  
  
 +
 +=== charging current ===
 +
 +
 +Charging current is stated as a fraction of C; 0.1C is 10A for a 100Ah battery.
 +
 +  * Trojan((https://www.trojanbattery.com/resources/battery-maintenance)) 
 +    * AGM 0.2C
 +    * Gel 0.13C
 +    * Solar Premium and Signature:  0.13C when charging time is unlimited.  "If charging time is limited [like with solar charging], contact Trojan Technical Support for assistance"
 +  * Renogy
 +    * LiFePO4 0.2C((https://www.renogy.com/content/files/Manuals/RNG-LFP_Manual_V1.0.pdf))
 +    * AGM 0.4C max((https://www.renogy.com/template/files/Specifications/RNG-BATT-AGM12-200.pdf)) unless labeled with 0.3C max
 +    * GEL 0.3C((https://www.renogy.com/content/RBT100GEL12-G1/GEL100-Datasheet.pdf))
 +  * Rolls((https://rollsbattery.com/wp-content/uploads/2018/01/Rolls_Battery_Manual.pdf))
 +    * Flooded 0.1C
 +    * AGM 0.2C (min 0.1C, max 0.3C)
 +    * GEL 0.2C (min 0.1C, max 0.3C)
 +  * Lifeline((https://lifelinebatteries.com/wp-content/uploads/2015/12/6-0101F-Lifeline-Technical-Manual-Final-5-06-19.pdf))
 +    * AGM up to 5C inrush, 0.2C minimum((https://marinehowto.com/how-fast-can-an-agm-battery-be-charged/))
 +  * Odyssey((https://www.odysseybatteries.com/odyssey/docs/us-ody-tm.pdf))
 +    * AGM 0.4C minimum, no maximum
 +  * EastPenn/Deka - 0.3C max((https://www.eastpennmanufacturing.com/wp-content/uploads/Renewable-Energy-Charging-Parameters-1913.pdf)) - 
  
 ==== Absorption stage ==== ==== Absorption stage ====
Line 51: Line 74:
 The absorption stage, sometimes called //acceptance//((which makes sense)) or //boost//((doesn't make sense!)), is a constant voltage stage during which the battery is brought to full charge.  This stage requires a **great deal of time** but decreasing amounts of current.   The absorption stage, sometimes called //acceptance//((which makes sense)) or //boost//((doesn't make sense!)), is a constant voltage stage during which the battery is brought to full charge.  This stage requires a **great deal of time** but decreasing amounts of current.  
  
-Absorption **begins when the battery reaches the absorption voltage** ([[electrical:12v:electrical notation|Vabs]], 14.8v in our example) and **ends when the battery tapers off current acceptance** to something like [[electrical:12v:battery_capacity|C/100]] ("End Absorb", "endAmps"),  and/or when a period of time has elapsed.  +Absorption **begins when the battery reaches the absorption voltage** ([[electrical:12v:electrical notation|Vabs]], 14.8v in our example) and **ends when the battery tapers off current acceptance**((that the battery is taking from the charging source)) to something like [[electrical:12v:battery_capacity|C/100]] to C/50((1A-2A per 100AH of capacity)) ("tail current", "End Absorb", "endAmps"),  and/or when a period of time has elapsed.  
  
 Example:  if you have a 100Ah battery bank and the manufacturer states that endAmps is C/100, then the battery is fully charged when it is only accepting 1A of current((100Ah/100 = 1A)) **at Vabs**.  An endAmps recommendation of C/200 would be the battery accepting 0.5A of current.((100Ah/200 = 0.5A)) at Vabs.   Example:  if you have a 100Ah battery bank and the manufacturer states that endAmps is C/100, then the battery is fully charged when it is only accepting 1A of current((100Ah/100 = 1A)) **at Vabs**.  An endAmps recommendation of C/200 would be the battery accepting 0.5A of current.((100Ah/200 = 0.5A)) at Vabs.  
Line 129: Line 152:
   - Float voltage - Li does not like to sit at 100% SoC,((the cells degrade faster at 100%+ SoC)) so a float voltage in the 13s allows them to come down off the peak and rest at a healthier voltage for them while still holding useful capacity.   - Float voltage - Li does not like to sit at 100% SoC,((the cells degrade faster at 100%+ SoC)) so a float voltage in the 13s allows them to come down off the peak and rest at a healthier voltage for them while still holding useful capacity.
  
-Also see [[electrical:12v:lifepo4_batteries_thread#charging|LiFePO4 (lithium) bare cell charging]]. +Also see [[electrical:12v:lifepo4_batteries_thread#charging|LiFePO4 (lithium) bare cell charging]] and [[electrical:12v:drop-in_lifepo4#an_approach_to_greater_longevity|thoughts about charging LFP gently]].
  
 ===== Equalization ===== ===== Equalization =====
Line 164: Line 187:
 This automatic voltage tweaking for temperature may result in your actual battery voltages being observably higher in cold temps and lower in hot temps.  This automatic voltage tweaking for temperature may result in your actual battery voltages being observably higher in cold temps and lower in hot temps. 
  
 +===== voltage sensing and compensation =====
 +
 +Relatively high current on a wire will cause the voltage to read high (while charging) or low (while discharging).  This can affect proper charging, load handling, etc.  Properly sensing and accounting for voltage deviation can make a major difference in the quality of a charging routine. 
 +
 +See [[electrical:12v:voltage_sensing|this article]] for a list of known chargers with voltage sensing abilities. 
 ===== Watering batteries ====== ===== Watering batteries ======
  
Line 231: Line 259:
 | Interstate GC2((https://www.interstatebatteries.com/support/golf-cart-battery-installation-and-maintenance))                                                                                                                                                                              | Min C/10 \\ Max C/7.7((.13C))\\ Vabs 14.8v\\ Vfloat 13.5v\\ Veq 16.2v                                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               | | Interstate GC2((https://www.interstatebatteries.com/support/golf-cart-battery-installation-and-maintenance))                                                                                                                                                                              | Min C/10 \\ Max C/7.7((.13C))\\ Vabs 14.8v\\ Vfloat 13.5v\\ Veq 16.2v                                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               |
 |                                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                               |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               | |                                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                               |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               |
 +
 +====== further reading ======
 +
 +  * [[https://web.archive.org/web/20150919125248/https://c34.org/bbs/index.php/topic,8216.0.html|Why going to float is NOT full]]
  
electrical/12v/charging.1641937135.txt.gz ยท Last modified: 2022/01/11 21:38 by princess_fluffypants

Page Tools

affilliate disclosure | the RVwiki runs on a virtual server from NetCup

Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
CC Attribution-Noncommercial-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki