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Author Topic:   Simultaneous Charging of 12-Volt and 24-Volt Battery Banks with Unspecified Two-Bank Charger
chad posted 02-20-2007 06:41 PM ET (US)   Profile for chad   Send Email to chad  
I have two starting batteries for my Yamaha 130 controlled by a perko switch, and two deep cycle batteries to run my 24v troll motor. Currently I have an onboard two bank charger hooked up to my deep cycle batteries. If I hook one bank of the charger to the starting battery and the other bank to the deep cycle battery, will all four batteries charge? Thanks, Chad
jimh posted 02-21-2007 12:35 AM ET (US)     Profile for jimh  Send Email to jimh     
It seems unlikely that the two-bank charger you have will be able to charge both a 24-volt battery bank and a 12-volt battery bank at the same time. Generally a battery charger has 12-volt outputs and when connected to a 24-volt battery bank charges the two 12-volt batteries in the 24-volt bank separately.

Since you gave no details at all of the two-bank charger, it is impossible to know what it is capable of. I suggest you consult the manufacturer of the charger to determine if it can be wired in some manner to accomplish the simultaneous charging of a 12-volt battery bank and a 24-volt battery bank.

jenkinsph posted 02-21-2007 10:23 AM ET (US)     Profile for jenkinsph  Send Email to jenkinsph     
Marinco makes trolling motor and charger plugs with four pin connections that allow you to do this. These are connected so that the batteries are placed in series for the
trolling motor to operate while in actual use, The connector
with four pins (black) has internal pins crossed to yeild the
24 volts for the trolling motor. A similar 4 pin connector plug (red) for charging places the two batteries in parallel.
This allows charging both batteries from a single bank output
from your charger.

Why do you need two batteries for cranking a 130 hp outboard?
Seems to me you could use one of the trolling combination type
batteries to start it up in a pinch. Just a thought, seems like it would save some weight.

Also if you are concerned with simple maintenance of the starting batteries a small trickle charger for this purpose may be a better route to take, their cheap. This would free up the existing charger for faster charging of the trolling
motor batteries.

On my smaller 150 sport I use the charging plug arrangement
described to charge two batteries. I have a 24v Motorguide
PTS and have the outboard connected across one of the batteries and I have my electronics across the other. The
outboard alternator keeps the battery it is connected to
charged up for the most part. I monitor my state of charge
and top off the charge at the end of each day and have never
had a problem in two years of use. I use group 31 starting
/deep cycle batteries flooded cell types.


where2 posted 02-21-2007 09:40 PM ET (US)     Profile for where2  Send Email to where2     
Alternatively, you could get one of these little magic boxes, and charge everything at the same time.

On our 25' Whaler Frontier at work, we utilize the 24v battery system to power the survey grade hydrographic depth sounder. We have dual 115Hp Yamaha 4-stroke engines, and a total of 4 batteries.

With the Stealth Charger, we can charge the 24V system while running the boat and the depth sounder. While on the trailer, we can charge the 24V batteries by charging either of the two starting batteries, and turning on the switch supplying power to the Stealth Charger.

jmorgan40 posted 02-22-2007 01:39 PM ET (US)     Profile for jmorgan40  Send Email to jmorgan40     
I installed the Stealth charging system on my 20 Outrage two years ago when I installed the Lenco Troll-n-Tabs. I have a starting battery, 2nd house battery and two 12 volt deep cycles wired as 24 volt for the Troll-n-Tabs. The stealth keeps all 4 batteries at 100% all the time. Works great. The owner sent me a diagram on how to wire so I could charge all four batteries. Basically, I have the House #2 and the 2 trolling batteries configured on the charger as a 36 volt bank. I do not have the trailer charging set-up since it was not available yet when I purchased the system. I know I can run the two 84 lb trolling motors for hours with all my electronics and lights. Make a short 20-30 minute trip back to the ramp and all batteries are at 100%. Works Great and I have been very happy with it.

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