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) =====


^ Li Boost voltage                                ^ SW1  ^ SW2  ^ SW3  ^ SW4  ^ SW5  ^
^ LiFePO4 14.0v                                | OFF  | OFF  | ON   | ON   | OFF  |
^ LiFePO4 14.2v                                | ON   | OFF  | ON   | ON   | OFF  |
^ LiFePO4 14.4v                                | OFF  | ON   | ON   | ON   | OFF  |
^ LiFePO4 14.6v((not recommended - secessus))  | ON   | ON   | ON   | ON   | OFF  |
^                                              |      |      |      |      |      |
^ 12.6v((3S Li-NMC, for example))              | OFF  | OFF  | OFF  | OFF  | OFF  |
^ 12.8v                                        | OFF  | OFF  | ON   | OFF  | OFF  |
^ 13.0v                                        | OFF  | OFF  | OFF  | ON   | OFF  |

An [[electrical:solar:status#setups_with_no_float|explanation of Floatless charging]]
===== profiles with float (lead chemistries) =====

==== boost ====


^ Pb Boost voltage   ^ SW1  ^ SW2  ^ SW3  ^ SW4  ^ SW5  ^
^ 14.1v((gel?))      | OFF  | ON   |      |      | ON   |
^ 14.4v((AGM?))      | ON   | ON   |      |      | ON   |
^ 14.7v((flooded?))  | OFF  | OFF  |      |      | ON   |


==== float ====

^ Pb Float voltage  ^ SW1  ^ SW2  ^ SW3  ^ SW4  ^ SW5  ^
^ 13.2v             |      |      | ON   | OFF  | ON   |
^ 13.5v             |      |      | OFF  | ON   | 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.