The electric technology for energy storage and generation is not there yet for what you want 500 nm and a gale or two. Diesel is still the cost effective proven workhorse. Gasoline outboards have the problem of how to store that much gasoline without blowing yourself up at worst and not being able to get insurance at best. Unfortunately the diesel outboard development collapsed so that leaves diesel directly to props or diesel to generator to motors. The latter is just too costly in both dollars and pounds of weight (batteries). As a sailing catamaran you should be able to sail that distance safely - both boat and crew experience - or don't go out in those situations until the boat and crew are able. Any motor is for entry and exit to harbors or to claw off a lee shore. And in such an emergency I would prefer an old proven diesel to electric. There are just too many unproven and "new" things about small electric propulsion from propellers, pod mounting, electric bus wiring, batteries, etc. to be comfortable and confident in a do or die situation. Wait a decade or two . . .
--- In electricboats@yahoogroups.com, "Bill Gow" <billgow@...> wrote:
>
> This looks like the kiss of death for my electric cat. If these guys are
> telling me I need a ton of lithium iron phosphate batteries (per motor), I
> can only imagine what conventional lead acid batteries would weigh. I could
> go diesel electric but just one electric motor costs more than two 20 Hp
> 4-stroke outboards, to say nothing of the diesel generator....
>
> I may still go with the lithium iron phosphate batteries and 315 W solar
> panels, though. That should give me much better reserve power for all my
> electrical equipment and better recharging as well. I hope I never need the
> outboards but if I do, I want them to have enough thrust to push my boat
> into a gale, navigate a rip current, maneuver quickly with a 400 Lb marlin
> in the line or take me to the next port in calm winds. I'm looking for a
> minimum of 500 mile range and I'll bet less that 100 gallons of fuel will
> get me that with the outboards.
>
> Thanks for the help. Nothing would have made me happier than to do this with
> 100% electric but that time hasn't come yet, I guess.
>
>
>
> -----Original Message-----
> From: [mailto:market04@...]
>
>
> Regarding the battery pack,I have checked it with our engineer.If you want
> it work for 6 hours,we should make 48V1000Ah battery pack for each motor .So
> we should make two 48V1000Ah for your two motors.However,the weight of the
> battery pack is about 1000 kilogram(about 1 ton) and we are not sure whether
> your boat can stand this weight.
>
> If the weight is two heavy for your boat,would you please tell us the max
> weigh you want and then we will design for other capacity.Hope your
> consideration,thank you.
>
> Hope your comment about that,
>
>
> Thanks&Best Regards,
>
> Krystal
> Oversea Sales
> Heter Battery Technology Co.,Ltd
> E-mail:market04@...
> Tel: +86-632-5292 912
> Fax:+86-632-5199 218
> MSN:krystal2010@...
> Website: www.heterbattery.com
>
