Connecting trolling motor with existing marine battery

[theshoaibahmed]

Hi all friend

Quick question. Can i connect and leave it connected my trolling motor with my existing marine battery which is already connecfed with 50hp mercury outboard motor? Or can i get some sort of adaptor which control 12v to my troll8ng motor so i dont have to worry about connecting and discounting my trolling motor all the time which i attached to my 14' fibre boat.

Thanks in advance

 

[alldodge]

You don't want to connect and leave it that way. Your putting both bats in parallel so both will get drained while trolling motor is used. What you should install is an ACR (automatic charge relay). The ACR will charge your trolling bat when the motor is running but will not drain your start bat

https://www.bluesea.com/products/7610/SI-ACR_Automatic_Charging_Relay_-_12_24V_DC_120A

 

[emoney]

Are you asking if you can use the same battery for both?

 

[havoc_squad]

Using a single marine battery for starting and trolling motor is a bad idea.

First, most marine batteries are built for functioning as a starter battery, not for use as a deep cycle for trolling motor use. There are some that can do both, but that's not a reason to use it for both.

Second, what are you going to do if you accidentally drain that battery a bit too much on a cold motor and forget to bring the manual start rope? Better remember to pack an oar or two to row back to shore.

 

[Texasmark]

Using a single marine battery for starting and trolling motor is a bad idea.

First, most marine batteries are built for functioning as a starter battery, not for use as a deep cycle for trolling motor use. There are some that can do both, but that's not a reason to use it for both.

Second, what are you going to do if you accidentally drain that battery a bit too much on a cold motor and forget to bring the manual start rope? Better remember to pack an oar or two to row back to shore.

Yes a bad idea. I learned that back in 1971 and found that Chrysler put a crank rope in a pouch on the under side of the cowling for a reason. Was lucky, It started on the first pull.