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--- electrical:12v:voltage_sag [2022/03/16 13:39]
frater_secessus [shorten the circuit]
+++ electrical:12v:voltage_sag [2022/03/16 14:00]
frater_secessus [voltage sense wire]
@@ Line 43: / Line 43: @@
 ==== 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

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