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--- electrical:12v:battery_monitor [2024/03/06 17:44]
frater_secessus [inexpensive shunts]
+++ 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 =====

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