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electrical:12v:battery_monitor

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electrical:12v:battery_monitor [2024/02/26 13:38]
frater_secessus [drift and reset] 		electrical:12v:battery_monitor [2024/10/21 10:43] (current)
frater_secessus [TL;DR]
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 [[https://amzn.to/4bxDjw8|{{ https://m.media-amazon.com/images/I/71g0M+mQjIL._AC_UL320_.jpg?100}}]] [[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   * Battery monitors start from a known State of Charge then count every Amp going into or out of the battery bank
 +  * the shunt can be internal to the battery (lithium batts with BMS comms) or external to the 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   * these measurements can go astray ("drift") over time and require recalibration
   * drift will be more noticeable with lead chemistries than lithium   * drift will be more noticeable with lead chemistries than lithium
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 ===== sizing ===== ===== 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 ===== ===== how they work =====
  
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 +  * YT:  [[https://www.youtube.com/watch?v=yMJ_vzB2avE|Sync settings for Lithium battteries - BMV-712 Smart]]
 ==== Bogart Trimetric ==== ==== Bogart Trimetric ====
  
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 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.  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 === === Renogy ===
electrical/12v/battery_monitor.1708972683.txt.gz · Last modified: 2024/02/26 13:38 by frater_secessus

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