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--- electrical:12v:renogy_dip_switches [2024/09/02 18:45]
frater_secessus [float]
+++ electrical:12v:renogy_dip_switches [2024/09/02 19:16] (current)
frater_secessus [TL;DR]
@@ Line 1: / Line 1: @@
+DRAFT - please report errors
 ====== DIP switches on Renogy DC-DC chargers ======
 ===== TL;DR =====
+  * the DIP configuration tables and nomenclature in [[https://www.renogy.com/content/RNG-DCC1212-20-BC/DCC1212-204060-Manual.pdf|the 20-40A-60A DCC1212 series manual]] are needlessly confusing.  The tables below intend to correct that
+  * the DIP switch area has indicator that shows ''ON↓''.  Pay close attention to this, especially if the charger is mounted and you are looking at it from an odd angle.
+  * in the tables below, lithium (Li) profiles effectively means "[[electrical:solar:status#setups_with_no_float|floatless]]" and lead (Pb) means "with [[electrical:12v:charging#float_stage|Float stage]]".  It is possible to define a quasi-Float for LiFePO4 using a "lead" profile;  see below.
+([[opinion:frater_secessus:pareto|about these summaries]])
 ===== profiles without float (lithium chemistries) =====
@@ Line 30: / Line 39: @@
 ==== float ====
-^ Pb Float voltage   ^ SW1  ^ SW2  ^ SW3  ^ SW4  ^ SW5  ^
+^ Pb Float voltage  ^ SW1  ^ SW2  ^ SW3  ^ SW4  ^ SW5  ^
-^ 14.1v((gel?))      | OFF  | ON   |      |      | ON   |
+^ 13.2v             |      |      | ON   | OFF  | ON   |
-^ 14.4v((AGM?))      | ON   | ON   |      |      | ON   |
+^ 13.5v             |      |      | OFF  | ON   | ON   |
-^ 14.7v((flooded?))  | OFF  | OFF  |      |      | ON   |
+^ 13.8v             |      |      | ON   | ON   | ON   |
+===== using a lead profile to float Li =====
+There are reasons for and against [[electrical:12v:drop-in_lifepo4#mythyou_shouldn_t_float_lithium|"floating" lithium]].
+Renogy Li profiles are charge-and-stop:
+  - charge to the selected Boost setpoint
+  - stop charging
+  - drift down to the reBoost setpoint, typically 13.2v,if loads are present
+  - start the charging cycle again
+If you want to //hold// a 13.2v floor instead of cycling repeatedly you might charge use a Pb profile to charge to 14.1v((the lowest available)) and "float" at 13.2v.  This would let the bank relax to somewhere between ~60-70%,((it's notoriously hard to predict, so play with it - secessus)) although with light loads you might not fall to 13.2v until sundown.
+A 13.8V float is unacceptably high((IMO - secessus));  it would pin the bank at 100% all day.  13.5v, the last option, may be acceptable if you are running heavier loads.  13.5v will put constant (albeit relatively gentle) charging pressure on the bank.  Experiment with it;  if it pins SoC at 100% all day then 13.2v might be healthier for the battery.

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