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Bowthruster not thrusting |
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marsella 
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Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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 Posted: 14 May 2024 at 04:06 |
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Similar question that I have - is 4.3kW motor good for 505/508 or it feels underpowered? I am thinking of adding a bowthruster to my 458 but want to stay below 5kW, in which case I can hook it up straight to my house battery bank
Edited by marsella - 14 May 2024 at 04:07 |
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Arcadia
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Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112 |
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Posted: 14 May 2024 at 13:17 |
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All of the Hanse installed thrusters run on a dedicated 24 volt bank very close to the thruster itself. The reason is at 24 volts the current draw will be halved and the close proximity minimizes voltage drop. Anything above 3 kW will be problematic running on the “house” bank.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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marsella
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Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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Posted: 14 May 2024 at 13:33 |
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My rough estimate is that Ancor 4/0 AWG should be fine to handle the needed current without significant losses, just not sure if some 4kW motor is sufficient for 46 ft boat
Edited by marsella - 14 May 2024 at 13:39 |
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Arcadia
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Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112 |
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Posted: 14 May 2024 at 14:28 |
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Marsella. A 4 kW motor will draw at least 400 amps at 12 volts. 4/0 wire will have about a 20 percent voltage drop which will cause problems and eventually kill the motor. I would recommend using a triple run of 4/0 to avoid problems with the configuration you are considering.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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Arcadia
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Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112 |
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Posted: 14 May 2024 at 14:30 |
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Also keep in mind that the 20 percent loss through the cable is only part of the total loss. The battery bank itself will surely drop 1 to 2 volts from the 400 amp demand. You’d be lucky to get 8 or 9 volts to the motor!
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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marsella
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Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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Posted: 14 May 2024 at 15:43 |
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Hmm not sure how your math works, 4000/13=300Ams of current, the rated resistance of Ancor 4/0 AWG is 0.05 Ohms per 1000 feet, so for 10 meters or 30 feet this will produce the voltage drop of 0.5 Volts or 4% which should be fine
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Arcadia
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Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112 |
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Posted: 14 May 2024 at 15:57 |
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There are many charts and calculators online that save us all the trouble! Not sure where you’re going wrong but voltage will not be 13 v. More like 11 v under load. Also you need to account for round trip wire resistance. I figure 50 to 60 feet including all the bends. I hope you don’t have a lithium bank because they don’t like large current draw. I have a 4.3kW on my stern thruster and it draws a solid 200 amps plus more on start up from a 24 volt bank so you can double that at 12 volt. My batteries are 3 ft from the motor.
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Leon / ARCADIA
2018 Hanse 588 Sag Harbor, NY |
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marsella
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Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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Posted: 14 May 2024 at 16:19 |
I did noticed this effect with Hanse supplied AGMs, but Victron Lithium did not show any noticeable voltage drop when hooking 2kW loads like espresso machine. I didn't try to hook up 4kW load though, cannot comment what would happen
Edited by marsella - 14 May 2024 at 16:20 |
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marsella
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Joined: 21 June 2022 Location: Antigua Jolly H Status: Offline Points: 592 |
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Posted: 14 May 2024 at 16:26 |
Yes, for 60 feet the voltage drop would be 1V for 4/0 AWG. I estimated 30 feet round trip is OK for my setup
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Black Diamond
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Joined: 24 October 2015 Location: Newport, RI, US Status: Offline Points: 1275 |
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Posted: 15 May 2024 at 09:53 |
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I think many people have concern over both the voltage drop as well as the house bank usage. If you are installing a thruster, why not stay within a proven configuration rather than trying something for which there may be no proof points? Why not put a 24V setup in place close to the battery and leave the house bank alone? No place to put the battery(s)? Unless there is someone out there who will say "this works"...?? |
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Rick
S/V Black Diamond Hanse 575 Build #192, Hull# 161 Newport, RI |
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Arcadia wrote: