Keep in mind that a single AGM 12v Group 31 battery that is rated at 100AH weighs 78 pounds. A bank of 4 will weigh 312 lbs and have a little over 3kwh usable capacity due to AGMs allowing for a deeper discharge. The eight batteries suggested below will weigh over 600 lbs.
As far as cost, quality Group 31 AGMs cost between $300 and $400 US, so a Honda 2000i is cheaper than 4 batteries and about 250 lbs lighter. Flooded batteries are cheaper but weigh about the same.
For racing, there's nothing electric that will beat your outboard for cost, simplicity and weight. Even a Torqeedo Cruise 4.0 R with a $4000 48v 100AH 120 lb. Lithium battery pack will weigh around 200 pounds for the whole drive system. The total drive cost would be more than $10,000 US and weigh more than twice as much as your current outboard and fuel tank.
For racing, electric just doesn't add up yet. I really wanted to convert my F-27 trimaran, but I wouldn't accept the weight penalty.
Eric
--- In electricboats@
>
> Hi Gary,
>
>
> There are several companies, some who monitor this list, who provide drop-in replacements for Atomics. Pricing varies from ~ $2500-$4500 excluding batteries. You can DIY with a kit for about $1500 but the mounting brackets, etc can be tricky.
>
> For batteries, you should figure on about 2KW (about 2.75HP) high-average draw - so 2 hours of runtime requires 4KWR of battery life...which at 50% depth of discharge is 8KWH. That's about 8 batteries (110AH, 12V). Since you race, you'll probably want maximum flexibility in where you place the batteries. That would suggest you go with AGM or Gel - most of which can be oriented in any direction. Systems range from 24-36-48V - and will also factor into battery decisions. Higher voltage runs at fewer amps, reducing heat-stress issues and allowing slightly smaller cables.
>
> You might consider fewer batteries and going with a genset like the Honda EU2000 (used/stored only on deck. This would give you extended range, reduced weight, but at slightly higher cost. Not sure how compatible that is with racing though.
>
> An electric outboard like the Torqeedo is hard to beat on price. Lightest weight would be with lithium batteries, but that's still a little bleeding edge.
>
> -Keith
>
> --- In electricboats@
> >
> > My boys and I have re-furbished a 1974 Catalina 27 for local PHRF racing in Melbourne FL.
> > The old Atomic 4 went overboard fast. Now we are thinking Electric. We can go O/B or I/B. We left the shaft in the boat and have a O/B bracket, but are leaning toward an inboard set-up. We don't use our gas 5.0 hp O/B much at all.
> > We race a lot so we need to keep her as light as we can. I figure we saved about 400 lbs by going to an outboard. We can get away with run times of an hour or two tops. I am a newcomer to electric so please keep it simple ( and Cheap!) Suggestions?
> > Gary Smith
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
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