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Deep Cycle vs. Trolling Batteries
On Thu, 21 Aug 2003 10:33:24 +0000, BinaryBillTheSailo wrote:
On Wed, 20 Aug 2003 20:19:15 -0700, "Lloyd Sumpter" wrote: On Wed, 20 Aug 2003 17:47:42 +0000, BinaryBillThesailo wrote: On Wed, 20 Aug 2003 07:09:29 -0700, "Lloyd Sumpter" wrote: Actually, the motor will run identically between deepcyle/trolling and starting. Sorry Lloyd, but you are incorrect on that point. Why? Does the deep cycle have different volts? Ohms law doesn't apply? Same volts, but a different power output curve. The starter battery is designed to output maximum amps for a short period. The trolling motor will gladly use whatever is available, and the starter battery will quickly lose output if you run the electric motor at full speed. The trolling motor will run like a jackrabbit for a short time, and then will lose it's enthusiasm. A deep cycle trolling motor will output lower amperage over a longer period. Think of the difference between a sprinter and a marathoner. That's why there are many different types of batteries. Different uses require different characteristics. BB There's a difference between how much current a battery CAN supply and how much the load is drawing. A 30-lb Endura pulls 30A at 12.5 V (approx) full load. It's Ohm's Law, not the battery characteristics, that determines the current. A fully charged battery, starting or deep-cycle, provides this: 30A is not excessive even for a deep-cycle. The discharge curves are slightly different, so the voltage drops differently between the two, but not enough to notice. As I said, the difference in this case is the ability to "come back" from a deep discharge. If we were talking about 200A, you'd be right. I've been running the exact motor he's talking about with a small starting battery and have not seen what you describe: it just slowly runs slower as the battery dies, over the course of several hours. Lloyd |
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