Rick,
If you've got any records of how much fuel that you burn in regular usage, I can back that into how much power that you actually use. From there, I can estimate how long a 1000 to 2000 pound battery pack would last. I'll warn you that when previous posters have asked similar questions, the results were not encouraging.
One rough estimate is that a 10kWh pack (200Ah @ 48V) weighs about 500 pounds and can deliver as much energy as one gallon of fuel through an ICE engine. So 1000 pounds of Flooded or AGM batteries will give you the approximate range of a 2 gallon fuel tank. But with some of your observed fuel usage, that number can be adjusted to your particular boat.
If you do convert, you won't need a gearbox that reverses, the existing transmissions probably represent a power loss that you won't want to keep in your boat. Other gear reduction methods are much lighter and more efficient. The drive can be connected to your original controls, so that your operator experience would remain the same.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "rflesvig" <rflesvig@...> wrote:
>
> Hello,
>
> I've been following post for quite some time now trying to figure out if I can make my plan work efficiently. I know it will work, but is it worth the money and time. I have a 28' Marinette, aluminum boat with a 12' beam.(@ 9' at the waterline) the boat weighs @ 7000lbs. I have to replace the engines, and I've always wanted to have an electric boat.(I have an electric truck, it's great) The engines are 318cu.in(240 hp @500lbs. each) The port engine turns C.C.W. and the starboard engine turns C.W. The boat cruises well at 2000 - 2400rpm. the wide open throttle is @4,400rpm. The transmissions are Warner Velvet Drive 1:1 ratio.I am looking at 2- AC-50hp induction motors,(6,500rpm) with Curtis controllers on 96 - 108 volt battery banks. I would like to mate the motors to the existing transmissions if possible.(simpler and would be able to run the boat like I do now) I would remove the 100 gal. gas tank, and there is plenty of room for batteries. My biggest question is how long the battery banks would last. I know it depends on how fast and how much load is put on the boat, but could anyone give me an idea if this would be feasible. Thanks for your time.
>
> Rick
>
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