Bavaria Yacht Info
Member Forums => Modifications & Equipment => Topic started by: Bjorn_J on January 06 2022, 15:41
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Hi!
I have an old Bavaria 44, 2004 with a Raymarine course computer 150.
I would like to replace it with a new Raymarine EV-200 or EV-400 autopilot.
The ACU-200 drive unit is rated 15A and ACU-400 is rated 30A, both at continous load.
The drive/gear is Lewmar Mamba standard for Bavaria 44 (89200092) and the electrical motor is rated 1/4 hp (appr 186W) at 12V, average cosumtion 4A.
The recommendation for the Lewmar Mamba motor is a 16A circuit breaker.
The question is if the ACU-200 is large enough (it is on the edge at max load)? The ACU-400 is much more expensive.
Have you tried one or the other?
Kind regards
Björn Johansson
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No first hand experience on said combination, but my engineering-thought:
1/4 HP max rated power is almost exactly 12V x 15A, so if it was my boat, I would not hesitate to use EV-200.
BR,
Tommi
s/y Anniina
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Hi Tommi,
I have the same engineering thoughts.
Kind regards
Björn
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A good ratio between computer power and motor average consumption is 5
For our motor that use average 4 amp, we need 20 amp computer.
Ev 200 is too small , 15 amp, in rough conditions when the autopilot must be affordable
EV 400 is rated 30 amp, in this case we have more reserve power.
I put Ev 400 on 40 CRUISER my 2008 and I am very satisfied in wind mode navigazione.
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Hi.
" Mamba standard for Bavaria 44 (89200092)"
Lewmar SKU might be 89300053 (Mamba 1/4hp 12v Std)
I am not an engineer.
But. I think in this case 1/4hk does not mean 1:1 electric motor power 186w and P=U*I... 15A.
We have Lewmar autopilot Integra drive 89300111. 1/8hp
Specification: AVERAGE CURRENT CONSUMPTION 4A, MOTOR 16A CIRCUIT BREAKER, CLUTCH 2A
Electric motor is Kenlowe KLM2189 , Output power 64w, Rated Current 8.3A (~ 1/8hp)
We have used it 15 years with Raymarine S1 smart pilot.
Specification: Drive motor output: continuous 5 A at 12 V, Drive clutch output: 1.5A at 12 V (FUSE 10A)
With 12V and without extra load drive motor will draw less than 2A. And 10A fuse is working fine without any problems.
I just want to say..
It is possible to use 1/8Hp and 8.3A (Rated Current) motor with the S1 course computer with 5A drive output without any problems.
(Rated Current) = Internet says... "The current drawn by a motor at its full load"
My opinion... Mamba 1/4hp 12v Std Rated current could be that 186w ~ 15A.
ACU-200 15 A (maximum continuous output) And Fuse is 20A
As Tommi and Björn told
If it my boat.. Hard to see any reason to pay extra and buy ACU-400.
The clutch might be a more interesting question...
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Why change the AP, if it is functioning? A new one does nothing else than the old one (exept draining you some 1000€ from your wallet). Yes, the new pretty shining displays.... but worth a fortune?
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Why change the AP, if it is functioning? A new one does nothing else than the old one (exept draining you some 1000€ from your wallet). Yes, the new pretty shining displays.... but worth a fortune?
New generation autopilots are a big improvement in spite old, specially in sailing mode and strong conditions.
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Hi,
thank you all for all the thoughts and recommendations. I have decided to go for the EV-400 to have soem extra margins.
Kind regards
Björn
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Righ choice.