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Battery compatibility....

Go with a group 27 battery if you have enough room. This will give you more amp hours for running electronics. The main thing with RV/marine batteries is they have thicker plates and withstand multiple discharge cycles.
 
I have no extra electronics, just need a starting battery. I understand battery construction. I have read here that the charging systems on these motors seem to be sensitive to battery internal resistance...That's why I was inquiring about a specific battery. So is the answer yes on the 24M XHD and the 27M XHD? Thanks
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I’d go with the 27 that should give you a higher CCA rating. I’ve never heard of battery incompatibility with a specific charging system. There might be model specific issues I’m not aware of but it sounds a bit strange.

One thing that helps is to have an onboard charging system. Using that to top off batteries can help to ensure it’s at full charge and doesn’t force the outboard charging system to fully charge the batttery.
 
Still4Fishin said:
Should your starting battery be the same battery as your trolling motor or is it better to have to separate batteries??
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I always like to keeping trolling and starting power separate. Trolling is easy to run the battery too low and not have enough juice to turn over the engine.
 
24 and 27 same cca, 1000, 800, respectively. reserve cap. is about 50mins. more with a 27, plus just under 10lbs more lead. Thanks..
 
Thanks for your advise ���� ... I have been looking at adding a solar panel as a backup charging system ( still doing research) while out on the water especially when I’m fishing the “no gas motor” lakes/ Reservoirs in Georgia. You have any knowledge about solar charging panels?
 
I'd be wary of a solar panel unless it has a good regulator between it and the battery.....too easy to cook the battery without one.....

A good one can be setup for the type of battery you have and accurately control the energy flowing into the battery....
 
​We seem to have two questions at the same time. Hopefully this will address both. You seem to have your group 24 vs 27 situation figured out. A good Cranking battery of 800CCA should be fine. If you have the room the 27 will just give you more reserve. You engine battery should never be your trolling motor battery. This motor has a 40 amp charging system at higher speeds (less at low speeds). The most important thing that will make the system delicate is LOOSE/dirty battery cables at either ends (battery or engine). NO WING NUTS on the battery ends. Some type of terminal should be used if you have lots of accessory wires from the boat? You want your engine battery cables by themselves & tight at all times. The regulator/rectifier can't make the proper decision without tight connections. That is the only delicate thing about this system Im aware of.
the rest is just a matter of amps per hour put back into the battery. I will assume you have at least a 24V trolling motor (maybe a 36)? You can add a battery isolator to your system & charge your other batteries, but by the time you divide the amp between 2 or 3 batteries you won't get much. The system with the isolator will fully charge the engine battery after each start up & then switch to other duties. This will depend on how much (and what speed you run)? Since the average trolling motor uses 30 amps of power at full power you can see that it is a losing proposition to expect the engine system to keep up. Again it is in amps per hour. It's an hour of running at speed to replace 40 amps into the battery. Hard to do the exact math since no way to tell what you will use cranking (minimum after initial start) or trolling motor settings. Every one has tried to make this work!
As far as the solar panel, I did just a little research & found small panels putting out 1/8 of an amp (useless) to 5 amps (still useless) and that panel is almost 2' X 3' in size. Again amp/hrs is going to kill you. At least it would be working for you the whole time your fishing. Solar panels are rated in watts. Don't forget to convert to amps to tell what your working with. Hope that helps.
 
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