I have a Scadden Assault kick boat.
I never use a trolling motor, but on a couple overnight trips a year, I have to do a 2.5 to 3 mile pool on the river, right at the very end to take out. Rowing this section is slow to say the least and I am usually tired after 2 days fishing.
I am wondering if I could use a wheel chair battery to run my 35# elec. motor for an hour or 45 minutes at the end of the trip to get through this section? Would give an extra hour fishing too. I know there is a formula to figure out run time. Just wondering if anyone uses a small battery for short run situations?
Any input, opinions or thoughts are welcome...thanks.
Battery ratings are usually stated for absolute perfect warm conditions, and at low 20 hour rate (about 1.6A on a 33 amp hour Werker). The capacity will be considerably less under cold conditions (maybe 50% loss below freezing) and if used continuously at maximum power (maybe 30% loss at 30 amps for a 30# troll motor). Also the cold decreases thrust rating and as the battery discharges thrust decreases (the last 20% capacity mostly not usable). If you have to continuously fight head W
aves or C
urrents in the open water section at full power, a small battery may not be enough.
If you can plan your trip at a time and on a route where you don't fight temperature and WWC, a small lead battery may work well enough. Your boat should be able to easily carry a heavy battery and troll motor. If your battery weight considerations are because of lifting issues, you might consider a lithium 12v battery which would weight 25% of the lead types for the same capacity, but the cost will be much more.
Hope this helps.