Running 2 graphs on one battery

Ive got a basic bench boat with a 25 hp motor.

One battery to run a graph and a transom electric motor.

I’d like to run 2, 5 inch graphs side by side if I could.

Would I see a big difference in battery consumption going to 2 graphs?

I think you’ll be just fine. Run a decent battery and keep it charged and you shouldn’t have issues. If you are using the TM all day you might drain the battery down but those graphs draw very little.

If you are concerned you could run the graphs on small lithiums.

I run 2 garmins off my starting battery. Most days don’t even fire up my motor besides to the spot and back to the launch

Agree with Matt and Bear on this, it all depends on how much you run the troller.

Agree with John, Matt, and Bear. Your trolling motor is going to be the most hungry component on there. Assuming you’ll run a 30lb or 40lb you could see amp draw of up to 30 amps/hr. Not likely that you’ll pull that many amps all day long but it will significantly impact your capacity compared to a Helix 5 which I think has a max amp draw of .65 amps/hr at full brightness (or 1.3 for 2 graphs). I always treated my trolling motor as a backup means to get home. If you draw too much power from your batteries to where you can’t start your motor, you’re not in a good spot. Better to run 2 batteries even if it’s a cheap walmart battery.

Have you ran a graph and trolling motor off of the same battery in the past? Generally if you’re running off the same battery you’ll get a significant amount of interference on your graph.

I’ve always had to run a separate battery for my starter motor and graphs and then a trolling motor battery.

But to answer your question two small graphs won’t draw much power. They are fairly small. Now if you’re running 12 in hummingbirds or something they are going to draw a lot of power.

Joe Scegura wrote:

Have you ran a graph and trolling motor off of the same battery in the past? Generally if you’re running off the same battery you’ll get a significant amount of interference on your graph.

I’ve always had to run a separate battery for my starter motor and graphs and then a trolling motor battery.

But to answer your question two small graphs won’t draw much power. They are fairly small. Now if you’re running 12 in hummingbirds or something they are going to draw a lot of power.

I downsized rigs a few years ago. Before this boat I had your typical 17.5 foot tiller set up. 24 volt, on board charger and a starting battery. I never worried about battery power or weight distribution.

If I run 2 batteries in the back I’ll probabaly move the gas tank towards the front of the boat.