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electrical:12v:b2b [2019/05/07 21:20]
frater_secessus [Battery to battery chargers]
electrical:12v:b2b [2019/11/12 12:47]
frater_secessus [limitations]
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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.
 +
 +**Charger throughput is generally limited** to 20-30A since higher rates would dictate $$$ internal components. This isn't as big a limitation as it might seem, since lead-acid [[electrical:solar:status#in_absorption|current acceptance drops substantially throughout Absorption]]. 
 ===== CTEK D250 series ===== ===== CTEK D250 series =====
  
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 [[https://amzn.to/2SkqVXq|{{https://images-na.ssl-images-amazon.com/images/I/41iC+8sIvJL._AC_US218_.jpg }}]] [[https://amzn.to/2SkqVXq|{{https://images-na.ssl-images-amazon.com/images/I/41iC+8sIvJL._AC_US218_.jpg }}]]
 The Sterling Pro Batt Ultra series is alternator-charging only, but can be configured to exact [[electrical:solar:charge_controller_setpoints|setpoints]]. The BB1260-12 is a 30A example and costs about $50 more than the D250S above.  The Sterling Pro Batt Ultra series is alternator-charging only, but can be configured to exact [[electrical:solar:charge_controller_setpoints|setpoints]]. The BB1260-12 is a 30A example and costs about $50 more than the D250S above. 
 +
 +===== Renogy =====
 +[[https://amzn.to/33HJ8ns|{{ https://images-na.ssl-images-amazon.com/images/I/51Hu4-7NxOL._AC_UL160_SR160,160_.jpg}}]]Renogy makes b2b chargers in [[https://amzn.to/2NGIP6U|20A]] and [[https://amzn.to/33HJ8ns|40A versions]].
 +
 +This charger has preset profiles for battery types.
 +
  
 ===== Redarc ===== ===== Redarc =====
 [[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.txt ยท Last modified: 2024/03/23 19:42 by frater_secessus