How Much LiFePO4 Battery Capacity for My Trolling Motor?

Lithium iron phosphate (LiFePO4) batteries provide significant advantages over lead-acid batteries for trolling applications. They deliver consistent power, fast charging, long lifetimes, and lightweight performance. But with different LiFePO4 batteries on the market, how do you pick the right capacity for your trolling motor?

Follow this guide to choose the ideal LiFePO4 battery for your needs:

Match Capacity to Motor Thrust

The first step is matching battery capacity to your trolling motor’s thrust rating. Higher thrust motors require more battery power for full performance. Refer to the table below for recommended minimum LiFePO4 capacities based on common trolling motor thrusts:

Trolling Motor Thrust	Minimum LiFePO4 Battery Capacity
30 lb	50 Ah
40 lb	75 Ah
45 lb	85 Ah
50 lb	100 Ah
55 lb	110 Ah
60 lb	120 Ah
70 lb	140 Ah
80 lb	160 Ah
101 lb	200 Ah
112 lb	225 Ah

In general, choosing a LiFePO4 battery with 1.5-2 times the minimum recommended capacity will give you extended run times on the water.

Calculate Your Required Run Time

Consider the typical duration of your fishing trips and how long you need the trolling motor to run between charges. The consistent voltage output of LiFePO4 batteries allows you to accurately estimate run time using Peukert’s equation:

Run Time (hours) = Battery Capacity (Ah) / Motor Current Draw (A) x 1.05

For a 100 Ah battery and 30A motor, the estimated run time would be around 3.5 hours.

Factor in Fishing Conditions

Your fishing location and conditions should impact your LiFePO4 battery selection. Here are capacity recommendations for different fishing scenarios:

– Small lakes and ponds – 50-100 Ah

– Inshore fishing – 100-150 Ah

– Offshore and all-day trips – 200+ Ah

– Competitions and heavy trolling – 300+ Ah

Opt for higher capacities if you need extended trolling time between charges. Some anglers use multiple batteries.

Consider Trolling Motor Compatibility

Before purchasing a LiFePO4 battery, verify compatibility with your trolling motor by checking the user manual. Most motors are compatible, but some require simple reprogramming or a voltage converter. Only use reputable, safety-certified LiFePO4 batteries from established brands.

Choosing the right LiFePO4 trolling battery capacity provides the power, run time, and performance you need. Match capacity to thrust, calculate required runtime, and factor in fishing conditions and compatibility. With this approach, you’ll be confident in maximizing your lithium battery investment.