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electrical:12v:b2b [2021/06/18 18:47]
frater_secessus [limitations] 		electrical:12v:b2b [2021/06/21 15:07]
frater_secessus [Kisae]
Line 129: Line 129:
 When the alternator input terminals detect at least 13.2v the charger will be switched to alternator charging.((trigger wire allows use of smart alternators))  When the alternator input terminals detect at least 13.2v the charger will be switched to alternator charging.((trigger wire allows use of smart alternators)) 
  
 +==== Redarc ====
 +
 +[[https://amzn.to/2TLGhtv|{{ https://m.media-amazon.com/images/I/71CqS887T8L._AC_UL320_.jpg?125}}]]
 +
 +  * [[https://amzn.to/3iZY3Uw|BCDC1225D]] - 25A 
 +  * [[https://amzn.to/2TLGhtv|BCDC1240D]] - 40A
 +
 +The Redarcs appear to do both buck and boost;  solar input voltage is 9v-32v.((https://www.redarc.com.au/Content/Images/uploaded/Manuals/BCDC%20Dual%20Input%20Instruction%20Manual.pdf))
 +
 +
 +
 +=== solar+alternator behavior ===
  
 +> The unit will always take as much power from the unregulated Solar input as it
 +can before supplementing that power, up to the maximum rated output, from Vehicle power input((https://www.redarc.com.au/Content/Images/uploaded/Manuals/BCDC%20Dual%20Input%20Instruction%20Manual.pdf))
  
  
Line 179: Line 193:
  
 [[http://www.bogartengineering.com/products/solar-charger.html|Bogart's SC-2030]] can work as a DC-DC charger as well as a PWM charge controller. [[http://www.bogartengineering.com/products/solar-charger.html|Bogart's SC-2030]] can work as a DC-DC charger as well as a PWM charge controller.
 +
 +===== gotchas =====
 +
 +Observe voltage input maximums on units with built-in solar charge controllers.
 +
 +Voltage-sensing units((triggered by elevated chassis voltage)) can misbehave when an undersized starter battery charger/maintainer is attached.  For this example we assume a 10A maintainer and a 20A DC-DC charger.
 +
 +  - starter battery voltage rises from 10A maintainer charging...
 +  - triggering the DC-DC charger...
 +  - which begins pulling up to 20A from the chassis
 +  - pulling down the starter battery since the 10A maintainer cannot keep up
 +  - starter battery voltage drops far enough the DC-DC turns off
 +  - repeat forever
 +
 +The workaround is to either charge the house battery first or to buy a big enough starter battery maintainer to support both the starter battery and DC-DC charger loads. 
  
 ===== further reading ===== ===== further reading =====
  
 [[https://diysolarforum.com/threads/dc-dc-charger-b2b-options-and-general-discussion.17211/|DC-DC charger (B2B) options and general discussion]] on DIY Solar Power Forum. [[https://diysolarforum.com/threads/dc-dc-charger-b2b-options-and-general-discussion.17211/|DC-DC charger (B2B) options and general discussion]] on DIY Solar Power Forum.
electrical/12v/b2b.txt ยท Last modified: 2024/06/02 20:28 by frater_secessus

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