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electrical:12v:b2b [2019/05/07 18:20]
frater_secessus [Battery to battery chargers]
electrical:12v:b2b [2019/06/02 13:58] (current)
frater_secessus [Battery to battery chargers]
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 ====== Battery to battery chargers ====== ====== Battery to battery chargers ======
  
-A b2b (or //dc-dc//) charger is a type of [[electrical:​12v:​alternator|isolator]] that boosts charging voltage to the house battery. ​ These typically cost more and deliver ​less current than normal isolator types+A b2b (or //dc-dc//) charger is a type of [[electrical:​12v:​alternator|isolator]] that boosts charging voltage to the house battery. ​ These typically cost more and are rated for less current than normal isolator types.((but they will provide more current overall during longish drives. ​ See below.))
  
 [[https://​amzn.to/​2RY2GNQ|{{ https://​images-na.ssl-images-amazon.com/​images/​I/​3131jBgz9LL._AC_US218_.jpg}}]] [[https://​amzn.to/​2RY2GNQ|{{ https://​images-na.ssl-images-amazon.com/​images/​I/​3131jBgz9LL._AC_US218_.jpg}}]]
 This kind of controller boosts the chassis voltage to voltage appropriate for proper lead-acid Absorption.  ​ This kind of controller boosts the chassis voltage to voltage appropriate for proper lead-acid Absorption.  ​
  
 +
 +===== limitations =====
 +
 +Lead-acid batteries require two things to get fully charged:
 +  - a high enough [[electrical:​12v:​charging#​absorption_stage|Absorption voltage]] (Vabs)
 +  - enough //time// at that voltage for the battery to stop accepting much current.(([[electrical:​12v:​battery_capacity|C/​100]] to C/200))
 +
 +DC-DC chargers address the first requirement,​ but unless you are driving for //hours// the isolator won't have enough time to fully charge the batteries. ​ DC-DC charging is very effective on cruisers (boats) that run the engines for hours each day.  They will, however, put more current into the bank due to their higher voltage.
 ===== CTEK D250 series ===== ===== CTEK D250 series =====
  
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 [[https://​amzn.to/​2VgTre7|{{ https://​images-na.ssl-images-amazon.com/​images/​I/​417F858GCdL._AC_US218_.jpg}}]] [[https://​amzn.to/​2VgTre7|{{ https://​images-na.ssl-images-amazon.com/​images/​I/​417F858GCdL._AC_US218_.jpg}}]]
 Redarc makes [[https://​amzn.to/​2VgTre7|a 25A b2b charge with MPPT]] similar to the CTEK. Redarc makes [[https://​amzn.to/​2VgTre7|a 25A b2b charge with MPPT]] similar to the CTEK.
 +
 +===== Ring Automotive =====
 +
 +Ring makes [[https://​www.ringautomotive.com/​en/​product/​RSCDC30|a 30A DC-DC charger]].
electrical/12v/b2b.1557278437.txt.gz ยท Last modified: 2019/05/07 18:20 by frater_secessus