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--- electrical:12v:voltage_sag [2022/03/16 14:00]
frater_secessus [voltage sense wire]
+++ electrical:12v:voltage_sag [2024/10/05 10:23] (current)
frater_secessus [voltage sense wire]
@@ Line 38: / Line 38: @@
 ==== adjust charging setpoints ====
+If your sag is consistent you could adjust your setpoints upwards.  If you have 0.2v sag and want 14.0v you would configure the setpoint to 14.2v.
+Or if your battery manufacturer offers a range of charging voltages like 14.0v - 14.4v you could configure 14.4v and know it will be ≤14.4v in real conditions.
@@ Line 45: / Line 47: @@
 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.
+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((up to some max, like +1v or +2v)) 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]])
+Some sense "wire" are wireless ([[https://amzn.to/3IbnnQg|Victron Smart Battery Sense]])
@@ Line 57: / Line 59: @@
 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]].
+Examples:
+  * [[https://amzn.to/3tiqlhu|Victron Lynx shunt]]
+  * [[https://amzn.to/3qbfcNJ|Victron VEbus smart dongle]]
+  * [[https://amzn.to/3ijF6u9|Victron BMV-712]].
-==== calibration ====
+==== calibration ====
+The controller may also have a **voltage calibration** setpoint.  If your sag is consistently -0.2v you could input that calibration.  You put in 14.0v or whatever you want and the controller increases voltage by 0.2v.
-    have a voltage calibration setting - sag varies with current so the user might need to figure out average sag in their use case.
+Unfortunately, sag varies with current so the user might need to figure out average sag in their use case.

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