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ContinuousWave: Small Boat Electrical
New battery and on-board charger not working.
|Author||Topic: New battery and on-board charger not working.|
posted 08-08-2007 12:33 AM ET (US)
I had a new battery and on-board charger installed last week. My son took the 170 Montauk out today for the first time with the new components. The battery was fully charged (green light on the charger) prior to using the boat today.
After he got home, my son plugged in the cord to recharge my batteries. The new battery after 6 hours is not recharging. Usually the starting battery recharges in a matter of a few minutes.
I have a 2007 Mercury 90 hp EFI 4 stroke "Veradito" that was installed last February to replace my old Mercury 90 hp carbureted 4 stroke.
Other than a defective battery or charger, could my outboard in someway be draining my starting battery?
posted 08-08-2007 07:58 AM ET (US)
Warren--The outboard should not have any parasitic current when it is off, other than perhaps a very small leakage current in the diodes of the alternator. That ought to be less than a milliampere or two.
You can measure the current drain on the battery in this condition by temporarily disconnecting the positive battery lead and inserting an ammeter (which is usually available as a function on a digital multimeter). Set the current scale to a low level and see if there is any appreciable parasitic current flow from the battery (with the battery charger turned off and disconnected).
Connect the positive lead of the meter to the positive terminal and the negative lead of the meter to the conductor that normally connects to the battery. A positive flow of current indicates a current flow away from the battery, and a negative current flow indicates flow of current into the battery (as from the charger).
posted 08-08-2007 08:42 AM ET (US)
What sort of charger? (Brand and model would be helpful).
If it's a smart trickle charger, and somebody left the
posted 08-08-2007 10:51 AM ET (US)
Thanks for the input. I'm calling my electronics guy this morning.
Chuck here's the charger that is installed.
posted 08-08-2007 12:41 PM ET (US)
My new charger is only at 4 amps (my other charger is 15 amps).
Before charging my batteries I turn off my Perko switch which shuts off all the electronics on my boat.
posted 08-09-2007 11:43 PM ET (US)
I guess I'm confused as to why the batteries would need to be charged after a day on the water. Are you talking about something like a trolling motor battery bank?
Maybe the charger isn't charging because the battery is already fully charged - as I would expect it would be after a day of running.
I have an onboard charger that was on my boat when I bought it, though frankly I have never used it. My batteries get pulled out of the boat and put on a trickle charger on a timer (4 hours a week) over the winter. Other than that, they get charged by the alternator during use. This past winter the boat was stored in heated storage, and I did nothing with the batteries, and both engines started right up after 7 months of no use.
Do most folks "charge up" after a day on the water?
posted 08-10-2007 01:37 AM ET (US)
I have 2 trolling motor batteries that need recharging after a day of black bass fishing.
Here's a picture of my son with a 6.5 and 5 pound bass. Ne uses my Montauk more than me.
posted 08-10-2007 06:20 AM ET (US)
I'm a little confused also. It sounds like you have three batteries on the boat and a one bank charger when you should have had a three bank charger.
posted 08-10-2007 06:56 AM ET (US)
The starting battery should be fully charged by the Merc's
Two trolling motor batteries, mmmm. 24V trolling motor? Or
How do you switch the charger between the batteries?
I'd start by putting a digital voltmeter across the battery
posted 08-10-2007 03:59 PM ET (US)
You need a 3 bank charger - this a charger with three separate charging circuits - one for each battery.
Here is an example: http://cabelas.com/cabelas/en/templates/links/link. jsp?id=0043939018868a&type=product&cmCat=search& returnPage=search-results1.jsp&QueryText=battery+charger&N=4887& Ntk=Products&Ntx=mode+matchall&Nty=1&Ntt=battery+charger&noImage=0
posted 08-10-2007 05:19 PM ET (US)
I have a 3 bank on-board charger with 3 separate charging circuits that charges 3 separate batteries. One of the three banks, the one that was connected to my starting battery, broke.
Instead of replacing my old 3 bank charger for $350 (2 banks still work). My electronics guy installed an additional single bank($100) charger and connected it to my starting battery.
Now I have a single bank charger just for my starting battery. I also still have my 3 bank charger of which I'm only using 2 banks which are connected to each of my 2 trolling batteries.
Each of my 3 batteries has its own separate circuit on-board charger.
My trolling motor is a 24 volt, 72 pound thrust, Minnkota.
Thanks for the input guys,
posted 08-12-2007 05:34 PM ET (US)
My bet is your starting battery is fully charged and doesn't need further charge from the charger unit. If you use the Minn Kota your two bank charger will bring the trolling motor batteries up for you because they aren't recharged as you use the boat....the starting battery does. With regular use the start battery shouldn't need any charging at all.
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