Differences

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

--- electrical:12v:voltage_sag [2024/10/05 14:23]
frater_secessus [voltage sense wire]
+++ electrical:12v:voltage_sag [2025/11/08 16:32] (current)
frater_secessus [TL;DR]
@@ Line 1: / Line 1: @@
 ====== Voltage sag ======
+===== TL;DR =====
+  * resistance in the circuit causes apparent voltage to **sag when discharging**
+  * likewise, resistance causes apparent voltage to **rise when charging**
+  * some sag/rise is normal. Circuits with excess resistance (undersized wiring, iffy connections) can cause apparent voltage to deviate enough to affect system performance
+  * voltage sensing can correct for sag/rise (within limits)
+  * [[https://www.bluesea.com/resources/1437|Blue Sea's documentation]] provides guidance on designing circuits with acceptable levels of voltage sag.
+  * sag is a function of [[https://en.wikipedia.org/wiki/Ohm%27s_law|Ohm's Law]]((in ''V=IxR'' form))
+[[opinion:frater_secessus:pareto|about these summaries]]
+===== overview =====
 [Note:  this article is written from the standpoint of the [[electrical:solar:charge_controller|solar charge controller]].  It affects all circuits to some degree and is not limited to solar. -- secessus]
@@ Line 76: / Line 92: @@
+===== voltage rise =====
+Voltage "rise" is the flipside of voltage sag;  it happens while charging rather than discharging.  The mechanism is the same.

RVwiki for vanfolk and others who live in vehicles