I have a 17 foot alumacraft navigator, tiller. For 3 years i ran a 55lb minnkota, 12 volt. For me, power was never a problem but the weak bracket would never hold in rough water when i backtrolled. Last year I switched to the 80 vector, 24 volt system and it was AWESOME! I would recommend the 80lb, but again buy what you can afford.