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--- electrical:12v:battery_monitor [2024/02/14 12:51]
frater_secessus [Victron SmartShunt]
+++ electrical:12v:battery_monitor [2024/04/26 14:37] (current)
frater_secessus [TL;DR]
@@ Line 7: / Line 7: @@
 [[https://amzn.to/4bxDjw8|{{ https://m.media-amazon.com/images/I/71g0M+mQjIL._AC_UL320_.jpg?100}}]]
   * Battery monitors start from a known State of Charge then count every Amp going into or out of the battery bank
+  * the current acceptance of the battery bank in Absorption can tell you how close to fully charged a lead battery is((applies to Li also but the numbers are much smaller and we are not chasing 100% necessarily))
   * these measurements can go astray ("drift") over time and require recalibration
   * drift will be more noticeable with lead chemistries than lithium
@@ Line 28: / Line 29: @@
 ===== sizing =====
-The shunt should be sized to handle your highest expected demand comfortably. For example, a system designed for 80A of current would require a 100A shunt.  A 25A shunt would be damaged while a 1000A shunt would not measure smaller currents accurately.
+The shunt should be sized to handle your highest expected demand comfortably. For example, a system designed for 80A of current would work well with a 100A shunt.
+A shunt that is **too small** a shunt will fail if exposed to current that exceeds its rating.
+A shunt that is **too large** presents different problems.  Firstly, it will usually be more $$$ than a correctly-sized shunt.  Secondly, each shunt is designed to measure a certain range of currents accurately.  A 1000A shunt designed to measure many hundreds of amps accurately will not do a good job measuring much smaller currents like our 80A scenario above.
 ===== how they work =====
@@ Line 47: / Line 54: @@
   * or a combination of the above
-For those reasons the monitor is regularly reset ("zeroed", "calibrated") when the bank is at a known state of charge.  This can be done at 0% or 100%; for practical reasons most owners will reset them when the bank is known to be at 100%.
+For those reasons **the monitor needs to be reset regularly** ("zeroed", "calibrated") when the bank is at a known state of charge.  This can be done at 0% or 100%:
+  - automatically by the monitor when a certain voltage setpoint is achieved.((14.0v = 100%, for example))
+  - manually by the user.  For practical reasons this reset is usually performed when the user observes the bank to be 100% SoC.
 One rule of thumb is to reset the monitor 1x/week.  There is no harm in doing a reset more often if you happen to notice it's sitting at 100%.  [Hopefully you won't regularly be encountering 0% - secessus]
@@ Line 111: / Line 121: @@
 By default the backlight is ON when  discharging and FLASHING((slow pulsing)) when charging.  The backlight can be toggled OFF/ON by holding the LEFT+RIGHT buttons at the same time. With the backlight disable charge vs discharge is still displayed by small icons on the left side of the display.
+== quirks ==
+The decimal point is small and moves as numbers increase.  Examples:
+  * 1**.**234A (also 0.123A)
+  * 12**.**34A
+  * 123**.**4A
 === Renogy ===

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