Posts: 2754
Location: Mauston, Wisconsin | Marine batteries are rated by "reserve capacity". This is usually defined as a discharge at a 25A rate to 10.5VDC. So if the battery is rated at 120 minutes reserve capacity, when fully charged it will last for ~ 120 minutes at 25A discharge rate. Now the trick! Battery discharge rates and capacity are not linear. If I double the discharge rate (50A), I will get 1/3 of the runtime (40 minutes) from the same battery. If I cut the discharge rate to half (12.5A), I will get ~ 3 x the runtime (360 minutes). Most trolling motors go up to 40-50A depending on the actual power setting. The lesson here is: What you expect. may not be what you get.
Al |
