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--- electrical:12v:battery_monitor [2024/02/26 13:38]
frater_secessus [drift and reset]
+++ electrical:12v:battery_monitor [2024/03/29 20:14]
frater_secessus [sizing] expanded
@@ Line 28: / Line 28: @@
 ===== 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 114: / Line 120: @@
 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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