RV and vandwellers wiki

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
Next revision Both sides next revision
electrical:12v:charging [2020/01/13 10:39]
frater_secessus [absorption stage] 		electrical:12v:charging [2020/05/13 12:22]
frater_secessus
Line 1: Line 1:
 [[lifestyle:words_of_wisdom|Words of wisdom]]: “Three stage chargers are easier on your batteries, charge them faster, fuller and help you use less water”((https://handybobsolar.wordpress.com/the-rv-battery-charging-puzzle-2/)) – HandyBob [[lifestyle:words_of_wisdom|Words of wisdom]]: “Three stage chargers are easier on your batteries, charge them faster, fuller and help you use less water”((https://handybobsolar.wordpress.com/the-rv-battery-charging-puzzle-2/)) – HandyBob
 +
 +
 +> A [ [[electrical:shore_power|shore power]] ] charger is a stiff source with unlimited energy and time. Your solar is a very soft source of unknown power and only a few hours to get the job done.  - sunking((https://www.solarpaneltalk.com/forum/off-grid-solar/batteries-energy-storage/299490-bulk-absorb-float-equalize-what-does-it-mean#post299490))
 +
  
 ====== charging deep cycle batteries ====== ====== charging deep cycle batteries ======
Line 39: Line 43:
  
 In practice absorption takes longer when the battery has been discharged deeply and shorter when it has not.((http://www.cheaprvliving.com/forums/Thread-Can-a-solar-panel-and-charge-controller-over-charge-a-battery?pid=96965#pid96965)) In practice absorption takes longer when the battery has been discharged deeply and shorter when it has not.((http://www.cheaprvliving.com/forums/Thread-Can-a-solar-panel-and-charge-controller-over-charge-a-battery?pid=96965#pid96965))
 +
 +**Mythbuster:** although it is commonly said that Vabs is attained at ~80% capacity...
 +
 +> charge current affects the SOC transition point from bulk to absorption charging - MaineSail((https://marinehowto.com/how-fast-can-an-agm-battery-be-charged/))
 +
 +MaineSail found that 
 +
 +  * charging AGM at C/2.5 (max rate) resulted in the battery being 63.3% "full" at Vabs and being fully charged in **5hrs, 30 minutes**
 +  * charging AGM at C/5 (min rate) resulted in the battery being 77.4% "full" at Vabs and being fully charged in **5hrs, 42 minutes**
 +
 +
  
 Some controllers will allow the user to configure the time or ratio of capacity/current (C///n//).  Sternwake says: Some controllers will allow the user to configure the time or ratio of capacity/current (C///n//).  Sternwake says:
Line 117: Line 132:
   - ambient temperature as measured by the charger.  This can be different from the actual battery temp due to position, relative height to the battery, or if the charger gets confused by its own heat.    - ambient temperature as measured by the charger.  This can be different from the actual battery temp due to position, relative height to the battery, or if the charger gets confused by its own heat. 
   - in the absence of actual measurements the charger will likely use the 77F laboratory standard.   - in the absence of actual measurements the charger will likely use the 77F laboratory standard.
 +
 +This automatic voltage tweaking for temperature may result in your actual battery voltages being observably higher in cold temps and lower in hot temps. 
  
 ===== watering batteries ====== ===== watering batteries ======
Line 147: Line 164:
  
 **Manual chargers** will not be affected by load as they are controlled by the user. **Manual chargers** will not be affected by load as they are controlled by the user.
 +
 +
 +===== battery voltage while charging =====
 +
 +Battery Voltage = Battery Voc((resting voltage)) + (Charge Current x Ri((internal resistance)))
  
  
  
electrical/12v/charging.txt · Last modified: 2023/09/16 12:22 by frater_secessus

Page Tools

Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International

affilliate disclosure

CC Attribution-Noncommercial-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki