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--- electrical:12v:b2b [2024/03/30 15:12]
frater_secessus [sizing]
+++ electrical:12v:b2b [2024/04/12 21:52] (current)
frater_secessus [Kisae]
@@ Line 213: / Line 213: @@
 This unit also seems to be sold under the Ring and Merlin brands.
+==== LiTime ====
+{{ https://m.media-amazon.com/images/I/71UNjnxThrL._AC_UL320_.jpg?125}}
+LiTime makes [[https://amzn.to/3xHGjq5|a 40A DC-DC/ MPPT combo]] that looks identical to the Redodo below. Specs appear to be the same:
+  * Pv input 13.0v - 26v, max 600w
+  * Alternator Input Voltage 11.3-24VDC, max 600w
+  * Smart Alternator Input Voltage 12-24VDC , max 600w
+=== solar+alternator behavior ===
+According to the Amazon listing:
+> The DC-DC charger will choose the DC input automatically rather than charging the service battery with both the solar and DC inputs
+=== starter battery maintenance behavior ===
+> When the starting battery voltage is between 3-12V and the living battery voltage is greater than 12.5V, press and hold "REVERSE CHARGE" for 3 seconds to start reverse charging. It is recommended to start the battery when the voltage is greater than 13V and exit reverse charging when the charging current is less than 10A or the voltage of the domestic battery is less than 11V.
+==== Redodo ====
+{{ https://m.media-amazon.com/images/I/71PVPwKPJxL._AC_UL320_.jpg?100}}
+Redodo makes [[https://amzn.to/3JhGtqN|a 40A combo DC-DC/MPPT]]:
+  * Pv input 13.0v - 26v, max 600w
+  * Alternator Input Voltage 	11.3-24VDC, max 600w
+  * Smart Alternator Input Voltage 	12-24VDC , max 600w
+No manual located as of this writing.
+=== solar+alternator behavior ===
+unknown
+=== starter battery maintenance behavior ===
+Amazon listing claims "supports reverse charging the starter battery through the service battery".  A seller answer later says:
+> When the starter battery voltage is between 3 to 12V and the service battery voltage is >12.5V, press and hold the “Reverse Charging” for 3 seconds to initiate reverse charging. It’s recommended to exit reverse charging when the starter battery voltage >13V and charging current <10A, or when the service battery voltage <11V.
 ==== SRNE ====
@@ Line 540: / Line 596: @@
-DC-DC chargers in 20A, 40A, and 60A output.  Switched on by ignition circuit on the D+ port, low output mode (12.5% of rated current) triggered by 12v on a dedicated terminal. ((https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf)) DIP switches for battery type, Vabs and Vfloat. [[https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf|manual]] (pdf) [[https://diysolarforum.com/threads/renogy-dcc1212-dc-dc-charger-teardown.10141/|teardown]]  Note:  some versions of the manual [[https://www.reddit.com/r/vandwellers/comments/okfkuk/my_batteries_inverter_and_dcdc_charger_came_in_i/h5899bw/|may have a typo]].
+DC-DC chargers in 20A, 40A, and 60A output.  Switched on by ignition circuit on the D+ port, low output mode (50% of rated current) triggered by 12v on a dedicated terminal. ((https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf)) DIP switches for battery type, Vabs and Vfloat. [[https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf|manual]] (pdf) [[https://diysolarforum.com/threads/renogy-dcc1212-dc-dc-charger-teardown.10141/|teardown]]  Note:  some versions of the manual [[https://www.reddit.com/r/vandwellers/comments/okfkuk/my_batteries_inverter_and_dcdc_charger_came_in_i/h5899bw/|may have a typo]].
 These chargers appear to have a 3 hour absorption duration.  This is usually insufficient for lead chemistries, but still longer than the 2 hour duration of the DCC series above.  From the manual:

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