On-Board Charger Wiring Diagram / Clarification

[Grizz1288]

I have installed a new 24V Riptide MK trolling motor on my boat. Along with that comes two brand new size 27 deep cycle batteries that will require charging and maintenance. I also have 2x size 24 marine starting batteries that I would like to charge/maintain at the same time. As I consider this amount of batteries to be a very large investment I am interested in installing an onboard charger/maintenance/trickle charger.

I started researching different options and may have jumped the gun purchasing a ProSport12 two bank charger. From what I could tell, this charger has the features and options that I want. I am confused when I read the literature about the 'ideal setup' that the ProSport12 is designed. I have attached a picture of the box where it describes that the max amount of batteries is 2, but then in the ideal use it says "Single 12V engine crank battery + One 12V house or trolling motor OR Two 12V trolling Motor Batteries (24V trolling motor) etc... So when it says OR is it saying that this charger can only charge the two trolling motor batteries or can it handle the single engine crank battery AND the two trolling motor batteries (which would be a total of three batteries). This to me seems like it should be able to handle the latter, that is the point of the two bank system (1 crank bank and 1 house/troll bank).

Now to examine the way I think the system should be wired. I have attached a sketch of the diagram I am contemplating. Can someone take a look at my wiring diagram and point out any flaws or something I'm not understanding. I believe I would need to add another circuit breaker or and inline fuse in the (SHORT?) series connection wire for charging.

I understand that this charger is only designed to output 12-Amps @ 12V. Which would provide ample charging capacity for a 2 (or 3 possibly) battery system based off its ideal use. I am assuming that these parameters were set forth because they are selling this product and advertising that the charging/maintaining can be done in a reasonable amount of time for professional anglers. Maybe they need the trolling/house batteries to charge overnight in a tournament scenario. This is not my application. I am fishing once a weekend maybe twice a week and always a few days in between. The speed at which the batteries are recharged is not a concern, just the fact that they are charged and maintained. Is the 12-Amp charger adequate to charge my 4 battery 2 bank system? Will it damage the charger? Has anyone else used this charger for an application like this?

Thanks in advance!

 

[alldodge]

Think of your charger as 2 separate bat chargers in one unit.
You will not be able to charge the 24V side using only one side of the charger, unless its wired in parallel during charging, because of the short

The charger is 12amp max fully distributed which means 6 amps each side. Placing 2 group 27 bats in parallel and trying to charge will take to long. It could be used as a maintenance charger once the bats are charged, but its not going to bulk charge

 

[Grizz1288]

I would install a CB in the series connector and disconnect it when going into charging. Then they would be in parallel without a short.

It describes fully distributed as 10-amps to the house bank and 2-amps to the crank bank. Is 10-amps still not enough to put a charge on two 27's in parallel given any amount of time?

So the better option would be a 20-Amp charger fully distributed (16/4 or 15/5 im guessing) between the two banks?

Thank you.

 

[roscoe]

2 Batteries means 2 batteries.
Don't know why there is a question on that.
This charger is not meant to charge 4 batteries.
Could it be done? yes
Should it be done? no
Will it tax or damage the charger? maybe
Will it fully charge 4 batteries? Don't know, depends on the charging monitoring system inside the charger.
Many charger vary the output as batteries reach full charge. Will that be hampered by connecting 4 batteries?//

Call their 800 number and ask them.
The owners manual, page 15, says Note 1: One bank cable connects to no more than one battery.


Hook this charger up to the 2 trolling motor batteries.

You should not need to charge the starting batteries unless they are left to sit for several months.

If they need a charge, then something is wrong with them, or your main motor's charging system.