Check the table above and cross-reference it with your user manual. The correct combination of cable size and fuse rating will depend on the distance traveled by a current within the cables, as well as on whether they are exposed, in conduit runs, or in a bundle. Q: What gauge wire is used to connect an electric trolling motor to a battery? most trolling motor manufacturers include this information in their user manual, on their website, or you can find charts on component manufacturers like Blue Sea Systems websites. Q: What gauge wire is used for 24 volt trolling motor extension cable?Ī: The correct combination of cable size and fuse rating will depend on the distance traveled by a current within the cables, as well as on whether they are exposed or in conduit runs. None of the things I listed are a problem if you can swim, right? If you undersize your wire, you could damage your motor, control board, or have a boat fire. (For example, if the chart calls for a 6awg, use a 4awg) If you go up in wire size, the worse that can happen is that it will cost you a little more money. To be safe, always go up to the next size wire. From my observation, it appears that the manufacturer upsized the wire on the shorter lengths to be uniform with the trolling motor lead and to prevent a smaller wire from acting as a fuse which could cause a fire. ![]() The formula generated a smaller gauge wire for the shorter length system connections and a larger gauge wire for the longer connections. The middle of the table wire gauge size matched exactly on the 24 volt motors, but the short length and the long length did not. I did the calculations and compared the numbers to the manufacturer’s information. If you wanted to use a standard table, you would need to use a 3% voltage drop table to avoid any chance of electric motor damage. I did more research on electric motors, and it appears that a drop in voltage of more than 5% can cause damage to a standard electric motor. The leading manufacturer calls for a maximum of 5% voltage drop, but the standard tables are categorized at 3% or 10% voltage drop. I went through all the information on the ABYC wiring guidelines, which are in line with the US Coast Guard Code, and got the formulas to generate a table. ![]() How do I calculate what gauge wire I need for my 24 volt This is why you need to check your propellor regularly for fishing line or weeds. I put the ammeter on my power cable while running my motor at full power, and it was lower, how much lower, I will leave it at lower, so we use the best wire per the information we have.Įlectric current can also vary based on the load or resistance against the motor. Keep in mind this is manufacturer information, and they might want to be on the safe side of the numbers. You can see on the chart that the maximum amp draw for my motor is 56 amps, per hour. If you look at the chart, it is right in the middle of my chart. My motor is a Minn Kota 80 lb Riptide 24 volt. I created the table including the highest demand motors in each voltage so it would be more useful and give you an idea of how the thrust relates to amperage. I went through the big three manufacturers’ information and generated a table. You can also look up product specifications on manufacturer websites, but this information can be buried in their site and hard to find. The main way to find how many amps your trolling motor draws is to look in the back of your manual. However, each motor is different so let us dig into the subject. After the electric trolling motor has started spinning, the amp draw will go down. This draw is startup amperage for maximum speed. Most 24 volt trolling motors have a maximum amp draw of 56 amps. ![]() For absolute compliance, please see the applicable standards.How many amps does my 24 volt trolling motor draw? This chart and the adjustments of temperature and bundling are only an approximation of USCG and ABYC standards. ABYC standards and USCG certifications should be met. Printable Chart - Voltage Drop at 12 Volts (Double the distances for 24 volt)Īll wires should be AWG sizes (not SAE, which are smaller), with insulation rated at 105☌ dry, 75☌ wet. The chart is based on an amperage capacity multiplier of: AWG wire size ampacity limits. However - if your wires are carrying only intermittent current, or carrying current well below the conductor's capabilities, they need not be counted in the bundle.
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