Re: [Amel Yacht Owners] Re: Distributed vs. Conventional Electrical Systems
Bill Kinney,toggle quoted messageShow quoted text
Thanks for doing the testing and providing the results. I knew that the SM bow thruster was more powerful than the earlier Amel bow thrusters but the upgrade in power is far more than I realized. From your measurements, if my math is correct, 420 x 24.1 = 10,122 watts/ 750 = almost 13.5 HP electric as compared to the unit on my boat having around 1.6 HP. In the case of your voltage measurement, can I assume that the 24.1 volts being measured at the battery terminals rather than the thruster motor terminals?
I have never seen a 500 AMP or larger DC breaker so perhaps the lack of availability is this is the reason Amel did not install that form of protection? Clearly the system has worked well for a lot of boats over a long period of time, but the fuses you mentioned do seem like a good idea in case a short ever developed.
With the SM motor rated for 6.3 KW and actually being hit with 10KW+ I can now understand the reason that it is important on the SM to limit the burst time to 30 seconds to control motor heating. With the thruster on my Maramu, a run of 2 minutes results in very very minor heating (Maybe a 10C rise at most) but then a thruster is generally only needed for short bursts so I think that the path Amel took to push the motor harder for a short duration was a good choice. I am wondering if it might be possible for me to increase the power on my thruster by changing to to a different motor? A doubling in power would be nice to have for higher winds, perhaps someone else has already looked into this? The lower unit of the thruster shares many of the same parts with the SM based on the bow thruster items I have ordered so far from Maude and I think even turns the same size prop as some of the SM's.
Would you know (or anyone else reading this) if the Santorin uses 12 or 24V on it’s bow thruster?
SV Sueno, Maramu #220