Deep Cycle Battery not good for starting??

[phx5kegsman]

Hi, I have a 1978 Johnson 115 on my 82 Ranger 130V. I currently have two Group 27 deep cycle marine batteries powering my trolling motor. And I have one Group 27 Deep cycle marine for my starting/house/electronics. Is this a good configuration? Lithiums are not in the budget right now. Also my trolling motor batteries are wired in parallel because I currently have a 12V trolling motor. Any suggestions on a better battery configuration? Does using a deep cycle for a start battery hurt the motor?

 

[Chris1956]

Using a deep cycle battery to start a motor hurts the battery.

The current 3 battery configuration you have now is just fine.

 

[phx5kegsman]

Do you know what the smallest size cranking battery that my motor requires?I don't think that the 10amp generator on my motor charges the deep cycle battery enough. At least, not on the lakes that I fish on. They're not very big. I have to run WOT for quite a while to charge it.

 

[Lou C]

To start a 115 outboard I would think the smallest I’d go is a gp 24 dual purpose or starting battery….
I have 2 dual purpose gp 27 marine batteries on my boat and they start the boat very easily and the 55 amp alternator has no trouble keeping them charged…

 

[dingbat]

Using a deep cycle battery to start a motor hurts the battery.

How is that?

Have used grp. 27 deep cycles to start my boat for years.

Average 9 years a pair

 

[Lou C]

As long as the DC battery has enough capacity for starting the engine it can be used and you’d think a gp 27 is plenty big for starting a 115 outboard…

 

[Crosbyman]

Deep cylcle trolling/starting batteries never gave me any problems for 20 years of use on my 75hp ETEC but I have now gone with marine STARTING battery rated 1000 CCA. .. grp24

works fine

 

[phx5kegsman]

You'd think so. I think the PT&T motor drains the battery more than the starter. It's the style that doesn't have relays. It's kinda slow and draws a lot of power I should probably look into that, but it's a can of worms I'd rather not open right now!

 

[Lou C]

On the other hand is your charging system actually putting out what it should be?

 

[cyclops222]

Does your motor have a built in Voltage Regulator ? Is it working correctly ?
Deep Cycle Batteries are used in OVERLOADED and run until they can not run anymore. All the time. Golf courses.
They take all kinds of abuse best.

 

[saltchuckmatt]

I use and have always used gp 27 deep cycle batteries and has no issues.

Now if your talking about the two batteries running a electric motor and you wear them down than it's unfair and probably incorrect to think that that motor can charge those up quick or at all.

They should be charged back at the dock with a plug in charger.

Is that what your saying?

 

[airshot]

According to most of the battery mfgrs, a deep cycle should not be used for starting purposes as they are not designed for the large amp draw needed for starting. Most out boards do not draw as much as a big V8 truck engine so it might not cause that big a problem. Deep cycle bats are used for long continuous draws and are not designed for high amp recharges. I know a guy that tows his 5000 lb boat with an S10 little pickup truck, well beyond it rated tow capacity and the trailer has no brakes. While this is not recommended and will cause excess wear and tear....it works ! Similar to using a deep cycle battery for starting purposes. Not best for battery but it can work.

 

[DeepCMark58A]

They make dual purpose batteries for cranking and electronics, I have them in 3 of my boats.

 

[saltchuckmatt]

They make dual purpose batteries for cranking and electronics, I have them in 3 of my boats.

Yeah, just purchased a group 31 one for a customers work boat. Made in the USA in Pennsylvania....decent price. Having trouble with a local battery company (father died and the son has screwed it up) and interstate.

Never again.

Go into any Costco with a volt meter/load tester....you might be surprised.

 

[cyclops222]

Lets be realistic about Lead Acid batteries. And their Lead being recycled. WAY WAY too much used EXCESS lead battery lead building up to be recycled.
Electric car batteries using Lithium are causing less need for lead batteries. So all those Leads are sitting too long on shelves getting weaker.
Oh well.

 

[cyclops222]

deleted

 

[phx5kegsman]

according to my onboard voltmeter I am at anywhere from 13V to 15V when I'm on the lake. Not sure how many amps my it's charging at. My motor has a rectifier. Don't think there's a regulator

 

[phx5kegsman]

The two batteries I have running my trolling motor are not being charged by the motor. Just the start/house/electronics battery is.

 

[Crosbyman]

according to my onboard voltmeter I am at anywhere from 13V to 15V when I'm on the lake. Not sure how many amps my it's charging at. My motor has a rectifier. Don't think there's a regulator

2 yellow one red = >rectifier


2 yellows one red one black=> rect-reg

 

[saltchuckmatt]

A 1978 outboard should only have a rectifier and that voltage is about right.

Also, they don't produce a lot of amps so the only time your getting a good charge is when your hauling the mail.