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Author Topic:   Engine-power Battery Charger For 12-Volt and 24-Volt
stubbleduck posted 03-25-2011 03:07 PM ET (US)   Profile for stubbleduck   Send Email to stubbleduck  
First, thank you for reading and providing ideas, thoughts and suggestions to my post. I would like to try to charge my 24-Volt system with my boat engine. The components on the boat include:

--Mercury 60 EFI FOURSTROKE producing 18 amperes
--12-Volt battery for cranking the Mercury 60
--24-Volt system to run the trolling motors, bow and transom

Currently the three batteries are charged with an onboard Minn Kota triple blank charger that is plugged-in after fishing.

I’m interested in removing the triple blank charger and installing a charger or converter, if it exists, to charge the two batteries that comprise the 24-Volt system.

Thus, my concept is to have [current] coming from the outboard to the 12-Volt starter battery--which it does now. Assuming that the starter battery becomes fully charged, I’d like the remaining [current] to then charge the batteries of the 24-Volt system. But, I’d like the [current to] flow to go through the 12-Volt starter battery into a converter or charger that in turn, sends excess amperes to the 24-Volt batteries. Additionally, the converter or charger could be plugged into an outlet which would serve as a triple blank charger.

I’ve drawn a nice diagram but don’t know how to post it.

Does anyone know if there is a converter or charger on the market that does this? I think this is what my truck camper does but I’ve not seen it in a marine application. Thank you in advance,

jimh posted 03-25-2011 03:45 PM ET (US)     Profile for jimh  Send Email to jimh     
You can charge your 24-volt battery stack from the 12-Volt charging current output of your outboard engine by using specialty product like the Yandina TROLLBRIDGE 24:

This device operates "by automatically putting two 12-Volt batteries in series when you need to run the trolling motor and in parallel for charging."

jimh posted 03-25-2011 03:48 PM ET (US)     Profile for jimh  Send Email to jimh     
If you have three batteries, you would install the TROLLBRIDGE 24 as shown in schematic diagram "B", and you will also need to use an automatic combiner relay (ACR) or voltage sensitive relay (VSR) to connect the two batteries in the 24-volt configuration to your engine starting battery for charging.
jimh posted 03-25-2011 03:55 PM ET (US)     Profile for jimh  Send Email to jimh     
You will also find in the recent archives of SMALL BOAT ELECTRICAL a prior discussion on this same topic. Here is a pointer to an article interest to you:

Charging Three Batteries In Separated 12 and 24-volt Systems

jimh posted 03-25-2011 04:01 PM ET (US)     Profile for jimh  Send Email to jimh     
I also suggest you investigate the products of DualPro. They appear to make a wide variety of marine chargers which could perform the function you need. I find their website a bit confusing to navigate, but here is a link:

Somewhere in there you should find a product that will do what you want.

stubbleduck posted 03-25-2011 05:00 PM ET (US)     Profile for stubbleduck  Send Email to stubbleduck     
Thanks Jim,

I have found the "charge on the run" and the Minn Kota triple bank "DC alternator" charger.

I think the thing I'm looking for is an AC/DC converter/inverter Triple Bank charger.

A single unit that:
During AC it would serve as a charger [at the house].
During DC it would serve as a charger [on the water from the outboard]

The link to dualpro may have it but I can't tell for certain. They list a product as the "professional series" but also list a product as "charge on the run."

I think I'm looking for a converter/inverter/charger? Similar to an RV setup but with a triple bank. I guess it would be possible to install a power inverter to my starter battery, and plug the existing triple bank charger into the invertor ????

PS - Disclaimer..... to anyone reading this in the future....I'm very scared of electrical and anyone reading this should absolutely be skeptical of what I trying to do, or do electrically. I'm very good with Old IH tractors but not good with anything electrical :) especially near water.

Jerry Townsend posted 03-25-2011 06:49 PM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
By only using two 12V batteries and charging both in parallel and running the trolling motor with the batteries in series - causes a problem if both batteries are drained. Maket sure that your battery for your engine is isolated from the trolling motor. ----- Jerry/Idaho
jimh posted 03-25-2011 09:08 PM ET (US)     Profile for jimh  Send Email to jimh     
stubbleduck--Please give hyperlinks to the other products you have found that can perform the required charging function. By giving information back to this discussion you will make the information content better and more useful.
jimh posted 03-26-2011 11:11 AM ET (US)     Profile for jimh  Send Email to jimh     
Another charger which can charge a 24-Volt battery stack from a 12-Volt source of charging current is the MinnKota MK2 DC2: 419589?product_id=2e52683d317dffbd3a07875e1c9dd352

stubbleduck posted 04-01-2011 01:20 PM ET (US)     Profile for stubbleduck  Send Email to stubbleduck     
Hi Jim,

Sorry to drop off, just got busy.

This maybe what I'm refering to

However, I don't think I'm going to remove my triple bank charger. I'll probable just add the dual bank dc charger that you provided in the last post. Thanks.

Everything I'm looking to do is in the RV world, except for additional banks so that multiple batteries can be charged.

Tonight I'll put a half charged battery in my truck camper and it will be charged up once I get to my destination for use all weekend. It will charge on the way home. Thus, I wish dual banks were availabl so that I could charge multiple batteries in the truck camper.

Conversely, I which my exising onboard triple bank charger could do the same with boat engine while I'm trolling.

If it was in one of the previous links you sent I didn't find it.

Happy fishing and battery charging!

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