Hi Mike,
Yep, Electric Yacht's rating of the 180ibl of 8.5kW (180A x 48V) does seem a little optimistic. The exact same motor and controller are rated at 5.5kW by Propulsion Marine in their drive systems. I don't know if EY has run their system under load at full rating (180A) for an hour to check the motor and controller temps, but I have done it with my Propulsion Marine system. At 5.5kW (110A x 50V) in my boat, these same components stay below 100C deg for as long as I can supply the electricity. I would say that the actual continuous rating is somewhere between the 2 ratings, the conservative 5.5kW from PM and the agressive 8.5kW from EY. Your suggestion of a 6.8kW-9hp (135A x 48V) rating for the 180ibl seems fairly reasonable.
But yes, I would agree that any drive based on a single Mars ME0913 (regardless of the vendor) would be undersized for the Valiant 40. By upgrading to the 360ibl system with 2 ME0913 motors, there should be sufficient power for the boat, but probably not the 17kW (360A x 48V) rating suggested by EY.
There are a number of other systems available from other vendors that will meet the 8.5kW requirements for the Valiant 40, but since you're an Electric Yacht distributor, I can understand your suggestion.
As far as using two 25A 48V chargers or one 50A 48V charger like the ElCon PFC3000, I guess that it's a matter of personal preference. I think that the charging/powering performance ends up the same.
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Mike Gunning" <mike@...> wrote:
>
> Well I think you are on the right track but I would suggest you consider the larger 380 unit, your choice. It will more easily push a boat with 23000 pounds displacement. The 180 put about 9HP to the prop. I also think you have a V drive. You might be able to eliminate that but not so sure with the larger motor, we have done that with a couple of Cal 40s that way. Do not know the generator, but it sounds like it might just make it and have some power left for the house. To recharge the battery bank and drive the boat, you would be well served to install two 48v 25AH chargers which the generator will be able to power. That will allow you to put 50 amps into the battery system. I would suspect 5o amps out would drive your boat at a reasonable rate.
> Good luck with your project.
> Mike
> Electric Yachts of Southern California
>
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