Victron Battery Monitor BMV-600

[Stu Jackson]

Which specific ProMariner charger do you have?

Once a relay between the batteries is installed, there is no need to have multiple outputs from a charger going to the reserve bank anymore UNLESS, as is described in the link to Maine Sail's article, UNLESS the charger splits its power and you only get a part of the output going to the house bank.

That's why it's important to know what specific charger you have.  You could RTFM for the charger and find out. 

[Paulus]

Stu, not sure what RTFM means?
Pau

[Steve W10]

Read The Manual, with a Friendly expletive  

[Paulus]

Thanks Steve, I did read the manual, believe or not, but the only thing it says that you can leave one or more studs(terminals) can be left unattached.
Paul

[Stu Jackson]

Paul, as long as that means you get full output if only one stud is connected, then that's the information you are looking for.

This is from the previously linked article from Maine Sail and is the part about outputs:

DC Charger Outputs
This 20A charger comes standard with three outputs which can be fed to three different banks. The output is distributed by demand not divided equally as some chargers are. So if a start battery was at 99% state of charge and your house bank was at 60% state of charge the house bank would likely be seeing the vast majority of the charging current 18-19A or so and the starter would be seeing 1-2A or less.

For owners who have a charge distribution system in place, such as an Echo Charger, Duo Charger, VSR (voltage sensitive combining relay), or in the US often referred to as an ACR (Automatic Combining Relay), the outputs can be "jumped" together as shown to create a simple "single output" charger.

Technically with this charger you don't need to "jump" the unused outputs if using it as a single output charger. The US distributor feels, and I agree, that it is a wise idea to equally load the output FET's so I chose to jumper than to even load the ouputs. The two red jumpers are jumping output 1, 2 & 3 to load all the output FET's equally. This essentially makes the charger a single output 20A charger rather than a three output 20A charger. All current in this installation will feed to the house bank and the starting bank will be charged via a Blue Sea Systems ACR relay. You would do the same with an Echo or Duo Charger.

This particular boat has an ACR / Automatic Combining Relay so the charger is being used as a single output. Keep in mind that nearly all chargers, with the exception of some very expensive ones, still only have ONE output setting, in terms of charge profile, so dividing it up is not really necessary unless you don't have an ACR, Echo Charger or Duo Charger type of battery bank charge distribution.