I have a Minnkota Endura 50 that I use on a 20' sailboat. I use it mainly to motor in and out of the Marina (15 minutes max. each way) but I occasionally use it to troll around the cliff areas to fish (sails stowed of course). In that case I usually keep it on the the number 2-3 setting. I just bought a 720 cranking amps/115 amp hours, 27 series deep cycle battery to power it. How long can I expect to use the trolling motor before I discharge the the battery? Can I use the motor several outings before I have to recharge the battery if I'm not taking much power away each trip? Also wondering if anyone is using a small solar charger to recharge/ maintain the battery while it's not being used? The battery is pretty heavy and hard to load/unload on the boat if I have to take it home each time to charge. The boat is dry stored on the trailer with no AC power available.
I had been using a 525amp battery (24 series a starting not deep cycle) but I decided to get the right kind and size to make sure I'm not left stranded.
I'm open to any suggestions.
Thanks,
Steve

The battery amp hours rating gives a ballpark clue. If you're pulling 30 amps, the battery should provide adequate power for ~3.8 hours (that's continuous). 20 amps --> 5.8 hours. etc. etc.

It is generally recommended that deep cycle batteries be recharged immediately following each use. If not done the main effect is reduced (perhaps greatly reduced) battery life.

A small solar charger usually provides way less than an optimum charge rate, but probably better than nothing!

C.