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electrical:12v:b2b [2019/05/07 18:20]
frater_secessus [Battery to battery chargers]
electrical:12v:b2b [2019/11/12 09:48] (current)
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 chargers were first marketed for cruisers (boats) since they 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.1557278437.txt.gz ยท Last modified: 2019/05/07 18:20 by frater_secessus