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electrical:12v:voltage_sag

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electrical:12v:voltage_sag [2022/03/16 13:38]
frater_secessus [Voltage sag] 		electrical:12v:voltage_sag [2022/03/16 14:00]
frater_secessus [voltage sense wire]
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 This is the majority position since most are unaware of the issue, or don't judge it to be important.  And it may //not// be a problem since since This is the majority position since most are unaware of the issue, or don't judge it to be important.  And it may //not// be a problem since since
  
-  - solar-only charging is often low-current charging, minimizing sag +  - solar-only charging is often low-current charging, minimizing charge-induced sag 
   - lead-chemistry batteries often have a range of Absorption and Float [[electrical:solar:charge_controller_setpoints|setpoints]] (see below)   - lead-chemistry batteries often have a range of Absorption and Float [[electrical:solar:charge_controller_setpoints|setpoints]] (see below)
  
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 ==== shorten the circuit ==== ==== shorten the circuit ====
  
-A shorter wiring run will have less sag than a longer run.  For this reason charging sources are mounted **as close to the battery bank as possible**.  +All other things being equal, a **shorter wiring run will have less sag** than a longer run.  For this reason charging sources are mounted **as close to the battery bank as possible**.   
 + 
  
  
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 ==== voltage sense wire ==== ==== voltage sense wire ====
  
-    use a separate voltage sensing circuit (just a pair of wires to the battery) for controllers that have this feature.  Since it's not carrying real current it's not thrown off by sag+A voltage sense wire is a separate wiring circuit running from the battery bank to the controller's voltage sense terminals (if so equipped).   
 + 
 +Since the circuit isn't carrying any real current there will be very little sag and even quite thin wires can be used to get an accurate voltage reading.  The controller will then adjust output voltage to put the desired setpoint voltage into the bank. 
 + 
 +Example:  The absorption setpoint (Vabs) is 14.0.  The sensed battery voltage is only 13.8v, so the controller actually puts out 14.2v.((or whatever it takes to get 14.0v at the battery)) 
 + 
 +Some sense "wire" are wireless (https://amzn.to/3IbnnQg|[[Victron Smart Battery Sense]]) 
 + 
 + 
 +==== networked shunt ==== 
 +  
 + 
 +Some controllers use networked [[electrical:12v:battery_monitor|battery monitors]] to report back what the battery voltage is in reality.   
 + 
 +Example:  [[https://amzn.to/3tiqlhu|Victron Lynx shunt]].  [[https://amzn.to/3qbfcNJ|Victron VEbus smart dongle]].  [[https://amzn.to/3ijF6u9|Victron BMV-712]].
  
-networked shunt  
  
-    use a controller that talks to a shunt at the battery 
  
  
electrical/12v/voltage_sag.txt · Last modified: 2024/03/10 13:58 by frater_secessus

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