Hello all, would like your advice on if a separate battery should be used on my soon to be arriving father’s day gift a Garmin Striker Vivid 4CV ? 

Can I power this off the trolling motor battery ? 

Or should I use a separate battery ? If so what Ah would be suitable for about 8 hrs use prior to recharging.

Once again ,Thank You for the knowledge and time it takes to answer my questions.

 

 

The specs are 1A Max.

Do you have a boat with starting battery? If yes use that.

TM battery can cause interference.

Tom

I've never tried my Garmin on the TM battery but like most have heard you can get interference. I use a seperate 7ahr SLA which I already owned. If I were getting a new battery I'd go with the same amperage lithium to save on weight. $70 for a Dakota lithium vs $23 for a Cabela's SLA. No problems with my  Striker Plus 4 lasting 8 hrs, don't know about the CV.

If you have a cranking battery use that.  
 

If not use your trolling motor battery.  If you see interference on the screen when the trolling motor is running,  buy a second battery.  Many people run electronics on the same battery as their trolling motor without any problems.

I'm in TB's camp, use what you have and see how it works first and the solution will present itself.  Heck, if you asked this question on some forums, people will suggest buying a 100 amp Lithium for $1k. LOL

 

FWIW, when I had a kayak, I used a 8AH battery from Cabelas on a 4" Finder and it lasted all day.

Try it off the trolling motor - if you see interference, you can put a filter on the sonar's power line. I ran a Garmin Striker 7cv off the single battery in my canoe...with the filter on, I saw no interference.

 

A ferrite-core clip on is what I used

https://www.amazon.com/Pienoy-Noise-Filter-Suppressor-Diameter/dp/B07GKBPYB9/ref=sr_1_42?crid=5L15VM0GAXLB&keywords=12v+DC+powerline+filters&qid=1655040273&sprefix=12v+dc+powerline+filters%2Caps%2C124&sr=8-42

2 hours ago, Tennessee Boy said:

Many people run electronics on the same battery as their trolling motor without any problems.

I honestly don’t know anyone who runs their electronics off the same battery or batteries as their trolling motor. I probably know 25 people who own their own boat and no one does this.

 

The problem is that a cranking battery is not designed for use with a trolling motor. And deep cycles are only supposed to be used with trolling motors.

 

So if your combining the two, you’re using something in a manner it’s not designed for.

 

You should already be using a separate cranking battery to start the outboard anyways, so why not hook it up to that.

I will only be using a 100Ah lithium,for trolling motor only.(NO gas engines on lake) So maybe a small additional lithium for the Garmin and lights which I may add in the future would solve any potential issues. 

Once again a HUGE Thank you, to all that reply. ??

I've heard all the talk before about interference from a trolling motor.  I don't know if this isn't true, or if lithium batteries keeping a more constant voltage eliminates it.  My front sonar(Garmin 7 something) is spliced into my trolling motor battery, at the trolling motor.  It works great.  Try it before you buy another battery.   

10 hours ago, gimruis said:

I honestly don’t know anyone who runs their electronics off the same battery or batteries as their trolling motor. I probably know 25 people who own their own boat and no one does this.

My first boat had a 12 volt trolling motor.  I had two trolling motor batteries wired in parallel and I ran my electronics off of the same batteries.  I did this for about 10 years and never had any interference issues.   Today most people are running 24 or 36 volt trolling motors so it’s more complicated to run other things off of them.  I’ve known people that have had interference problems. I’ve even heard of people getting interference that leaked through the onboard charger from the trolling motor batteries to the house battery.  It happens but not always.  There is nothing wrong with having a fish finder and trolling motor on the same battery if interference is not an issue as long as you have enough battery capacity.  

Lifepo4 batteries have dropped in price, the size of a brick and the weight of a shoe to run your FF.

I can go 2 trips on a 10 ah lithium before a charge is necessary.

 

Have to admit though, went straight to a separate battery because of the interference issues I've heard others claim but didn't take the time to experience it myself.

I've got two Garmin CV Striker 7's. Both are wired to the starting battery. My trolling motor is the only thing wired to the t/m battery. 

12 hours ago, Tennessee Boy said:

There is nothing wrong with having a fish finder and trolling motor on the same battery if interference is not an issue as long as you have enough battery capacity.  

 

I think there was some confusion here on the subject.  I was specifically referring to using the same battery for a trolling motor, electronics, etc as starting the outboard.  Apparently the OP doesn't even have an outboard so its a moot point.

 

Running a trolling motor AND electronics, etc off the same battery you intend to start the outboard with is flat out a bad idea.  One of these times the battery is going to be drained too far and the outboard won't start.

 

My point was that deep cycle batteries are intended for a trolling motor and cranking batteries are intended for everything else.  Mixing in the two will create a situation that they aren't intended to be used for.

4 minutes ago, gimruis said:

My point was that deep cycle batteries are intended for a trolling motor and cranking batteries are intended for everything else.  Mixing in the two will create a situation that they aren't intended to be used for.

Ya - I'm going with all separate batteries on the F-9

100ah AGM - Trolling motor

35ah AGM - 'house' battery (lights, pumps, electronics)

24m Marine starting battery - for the 25hp 'Rude

Give it a try.  If your trolling motor has a continuous sweep of variable speeds, then it might cause interference.  You'll notice it as the sonar screen will show noise at certain speeds that goes away when you either turn off the trolling motor or run it at full speed.  If it's a set speed (like 5 forward, 3 reverse), then it shouldn't create any interference.  But you never know until you try.  Some sonar units are better at filtering out noise than others.  

 

If you do get a second battery, a 10-12 Ah battery should last you the full 8 hours, no problem.  Usually, you don't want to run them down below 50% capacity (unless you go lithium), but these batteries are so cheap, then I don't worry about that.  And I've found some smaller sonar units that claim a draw of 1 amp don't actually draw anywhere near that.  I run my Hook2 5 off a 7Ah battery and it lasts 8 hours, easy.  

I went 16 hours with my Garmin Striker with a Nocqua 12v 10ah.  The battery is as big as my fist. 

On 6/12/2022 at 6:37 AM, gimruis said:

I honestly don’t know anyone who runs their electronics off the same battery or batteries as their trolling motor. I probably know 25 people who own their own boat and no one does this.

 

On 6/13/2022 at 5:41 AM, gimruis said:

I think there was some confusion here on the subject.  I was specifically referring to using the same battery for a trolling motor, electronics, etc as starting the outboard.  Apparently the OP doesn't even have an outboard so its a moot point.

 

Running a trolling motor AND electronics, etc off the same battery you intend to start the outboard with is flat out a bad idea.  One of these times the battery is going to be drained too far and the outboard won't start.

 

My point was that deep cycle batteries are intended for a trolling motor and cranking batteries are intended for everything else.  Mixing in the two will create a situation that they aren't intended to be used for.

I guess that since we don't actually know each other, you can still claim not to know anyone that does that, but I run two Group 27 12v AGM deep cycle batteries for everything (the 40 hp outboard with electric start, 24v trolling motor, and two fish finders; a Garmin Striker 5 and a Humminbird Helix 5). The 24v trolling motor runs off of both batteries. The outboard runs off of one of the batteries. The fish finders, lights and anything else runs off of the same battery that starts the outboard. I do keep a NOCO jump start battery charged and stowed just in case, but IMHO, everyone should probably have one of those regardless of what setup you have. The 40 hp Mercury four stroke is super easy to pull start, should the need arise. 

 

I do sometimes, but not always, get a little interference on the Garmin if the trolling motor is operating on the absolute highest speed.

 

I also had a 19' Ranger with a 200 hp Merc many years ago that I bought when it was a year old. It had been set up by North Hollywood Marine (a very respected Ranger dealer BITD here in SoCal) with only two 6v Trojan golf cart batteries run in series. I had a Lowrance x-15 paper graph and a Bottom Line LCD graph up front (as well as two built in flashers) on it that operated with no problems in conjunction with the 12v Mercury Thruster trolling motor that had a whopping 42 lbs of thrust LOL. 
 

I could run everything all day on both rigs with no problems. No issues starting the outboards, and batteries would last many years.

On 6/12/2022 at 8:25 AM, MN Fisher said:

Try it off the trolling motor - if you see interference, you can put a filter on the sonar's power line. I ran a Garmin Striker 7cv off the single battery in my canoe...with the filter on, I saw no interference.

 

A ferrite-core clip on is what I used

https://www.amazon.com/Pienoy-Noise-Filter-Suppressor-Diameter/dp/B07GKBPYB9/ref=sr_1_42?crid=5L15VM0GAXLB&keywords=12v+DC+powerline+filters&qid=1655040273&sprefix=12v+dc+powerline+filters%2Caps%2C124&sr=8-42

I would recommend a dedicated battery. 

I'm running my Garmin SI unit off the TM battery in the pond hopper. I've run graphs long enough to know what is what...most of the time. I have a choke on the graph and I still get interference. 

1 hour ago, Big Hands said:

I do keep a NOCO jump start battery charged and stowed just in case, but IMHO, everyone should probably have one of those regardless of what setup you have.

We are in agreement on this part. A backup option is always a good idea. I even have a secondary backup option too: jumper cables.