Battery Question???

[sockeyerun]

I have a 40hp 2 stroke Yamaha with electric start. After reading the post "rectify my rectifier",I have a question on my charging situation. I run an aftermarket tilt & trim,lights,fish finder all on one battery which is an EXIDE Nautilus, severe service commercial grade,1000 cranking amps. should I be using a deep cycle battery for my accessories?Also,I use a Ship'n Shore 10amp fully auto charger(for deep cycle/marine batteries). input 2amps,output 10amps. Is this the correct one to use?? My battery has ran down before...... Thanks

 

[markcv]

Re: Battery Question???

I have a bass boat that I use all kinds of little trinkets on my cranking battery. I have no problem with running my battery dead. The only thing I have on my deep cycle battery is my trolling motor. My cranking battery has two fish finders,twin metering guages, two live well pumps, bilage pump and cell phone jack, and radio. Maybe you have a charging problem or a bad battery.<br /><br /><br />Markcv

 

[sockeyerun]

Re: Battery Question???

OK,Here's a question. Do these motors charge at the same rate at idle or just barely on the throttle(back trolling in a river) as when they are running at a decent clip?

 

[JB]

Re: Battery Question???

Hey, Sockeye. These charging systems (alternators) charge even at idle, but not as much as at cruise. If you are concerned, invest in a voltmeter. Anytime it reads in the neighborhood of 13 or 14 volts the alternator is making more current than is being used (charge); when it reads 12.6 volts or less you are using more current than is being provided by the alternator (discharge). With that 1Kamp battery you could be in the discharge situation for many hours without risking it's ability to restart you later.<br /><br />Hope that helps.<br /><br />Luck.<br />JB

 

[sockeyerun]

Re: Battery Question???

Thanks,yes I do have a voltmeter. it reads in the 13 range so it must be OK. I really don't think I have a problem,I do most of my fishing back trolling or drifting. So in time during low water conditions I use my T&T more,battery doesn't run all the way down but I notice the lift working slower. My motor probably just doesn't run open long enough to fully recharge. Thanks again

 

[Retro]

Re: Battery Question???

I have a question to add to this that was brought up. Looking through the Chilton manual I got from the library yesterday, it says the motor won't charge a battery that already has over 12.5 volts, i.e. a somewhat fully charged battery. Is this specific only to, say, Yamaha motors, or is this nonsense from the book?<br /><br />My battery charges somewhat, it goes from 12.7 to 12.9 or so, and I have replaced the rectifier hoping I could get to 13 or 14. My battery hasn't died, hasn't even lost it's charge of 12.7 volts in many hours of use. So I'm not overly concerned at this point. After all, it's running better than it has in some time.<br /><br />Hmmmmm...

 

[12Footer]

Re: Battery Question???

Charging systems can suply as much as 18volts (chevy) on a dead battery.<br />However ideal charge rate is allways 13.8VDC.<br />A battery is considered fully chraged at 12VDC. The regulator will manage the job of suplying the voltage the battery can safely take.<br />In a previous post,I sugested the all electrics and electronics be placed on the auxilary battery. It's not the normal setup<br />on most boats. Some boats have a daul-battery system,setup on a heavy rotary switch. Some only come with 1,and in the case<br />of bass boats and others, Deep-cycle batteries are installed to run the trolling motor. My point was, I would rather kill my TM than my outboard's starter,because it is a bugger-bear to pull that starter cord with all that compression.It can pull back too,and that can't bite enough.

 

[JB]

Re: Battery Question???

Hey Retro. In addition to 12Footer's accurate input, let me say that Chilton is correct but misleading. Your voltage regulator will keep the charging voltage (pressure) at 13 to 14.8 volts. That will produce a "charging" current (flow) to your battery, even if it is fully charged (12.6 volts). It is sort of like pouring a small stream of water into a full glass that is pouring out a small stream of water. The idea is to supply all your electric and electronic goodies with current while keeping the battery charged or keeping it from discharging (when the "load" current exceeds the charging current) too far and too fast. <br />Does that help??<br />JB