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electrical:12v:lvd [2017/05/28 13:29]
frater_secessus [common LVD setpoints] 		electrical:12v:lvd [2018/06/23 16:37]
frater_secessus [common LVD setpoints]
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 ====== Low Voltage Disconnect (LVD) ====== ====== Low Voltage Disconnect (LVD) ======
  
-A low voltage disconnect is used to stop loads from dragging a battery bank below a given voltage.+A low voltage disconnect is used to stop loads from dragging a battery bank below a given voltage (Vlvd).
  
-In most installations all loads go through the LVD except the [[electrical:inverter|inverter]], due to the heavy current draw.  The inverter will have its own internal LVD.+The simplest way to implement an LVD is to wire all loads go through the LOAD output of the charge controller, and set the controller's Vlvd.  If system load is heavier than the LOAD output can provide, one may use: 
 +  * a stand-alone LVD with higher current rating (more expensive) 
 +  * or run loads off a [[electrical:12v:relay|relay]] triggered by the LVD (less expensive) 
 + 
 + except the [[electrical:inverter|inverter]], due to the heavy current draw.  The inverter will have its own internal LVD.
  
 ===== common LVD setpoints ===== ===== common LVD setpoints =====
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 This following chart((http://www.trojanbattery.com/pdf/GEL_Trojan_ProductLineSheet.pdf)) shows DoD vs expected duty cycles.  In an offgrid scenario we will assume the bank is cycled every night.  If the bank is drained to the usual 50% DoD the bank((under lab conditions)) is predicted to last 1000 cycles, or about 3 years.  If the bank cycle is shallower to 20% DoD the bank is expected to last 2500 cycles, or about 7.5 years.  If the bank is deeply cycled to 80% DoD the bank is expected to last 500 cycles, or about 1.5 years. This following chart((http://www.trojanbattery.com/pdf/GEL_Trojan_ProductLineSheet.pdf)) shows DoD vs expected duty cycles.  In an offgrid scenario we will assume the bank is cycled every night.  If the bank is drained to the usual 50% DoD the bank((under lab conditions)) is predicted to last 1000 cycles, or about 3 years.  If the bank cycle is shallower to 20% DoD the bank is expected to last 2500 cycles, or about 7.5 years.  If the bank is deeply cycled to 80% DoD the bank is expected to last 500 cycles, or about 1.5 years.
  
-{{ :electrical:12v:ladutycycles.png?direct&400 |}}+{{ :electrical:12v:ladutycycles.png?direct |}}
  
-The sweet spot appears to be 40% DoD, about 12.3v.+The sweet spot appears to be 20-40% DoD, depending on manufacturer.
  
  
electrical/12v/lvd.txt · Last modified: 2023/09/06 10:54 by frater_secessus

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