Thread: Battery life when trolling cranks.

I have a bass tracker 17.5 and I get 9 hrs sometimes more, but I hardly ever troll that long in one day, I do not always charge my batteries after each use, sometimes 2 or 3 trips before I charge. 2 sears die hards

I don't remember my brands. But, I have two batteries rigged up. One is a group 24 good for about 6 hours on my 16' panfisher. I have a group 27 and have not learned how far it will go yet. Beagleman has me thinking Diehards. I have never had that luck.
DP

The Sears Marine Batteries are a little pricey,,however,,I have trolled 12 hrs on 2 hooked in a series, using a 14ft john boat, with 55lb thrust trolling motor and also had lights on etc, 2 depth finders, and never run out of power, the 1100amp Marine battery also weights 75lbs each, check em out,,they are a great battery with 3 yr warranty I think.

Do you have the Interstate 27s or 27Bs? What setting is the Terrova on when running at your trolling speed?

Your motor can draw 56A max, but that's going to depend on speed, wind and boat load. If you go worst case, you need to first figure out how fast you are drawing power. At 50% setting, you'd be drawing the equivalent of 50% X 56A or 23A. (It's more complicated than that, but it works to estimate). Since battery RC is calculated at 25A (normally), you need to divide your power use (23A) by the 25A to get a scaling factor for the battery RC. 23A/25A=0.92. Divide the battery RC by that number. The Interstate 27 has 160 minute RC, so 160 minutes divided by 0.92 is about 174 minute run time. For the 27B, you have 180 minute RC so it would be 195.6 minute run time.

If you are able to measure what your TM draw at 100% in typical fishing conditions, you can get a much better calculation. This is just an estimation, and the battery capacity will get smaller with each use.

I just put two interstate group 29's "i believe" in my boat this spring. They have around a 190-200 RC. The boat is a a 2072 Alumacraft with a 75pd thrust motorguide. I have trolled up to 6hrs on them, and still did not run out of battery. I always plug the boat in to charge as soon as I get home with my minn kota 345 onboard charger. I dont know how many hours they would pull at trolling speed as I have not ran them down yet. My 2072 Alumacraft has a large footprint, so it has a lot of drag in the water. I would think with you having a smaller boat and 15-20% less RC on your batteries, you would get similar run times as mine.