You want simple answers, here you go.
An electric drive will be more expensive and lower performance than an ICE solution.
Hp conversions are typically 1hp (750W) electric for every 2 to 3hp of ICE. A more consistant conversion is 1kW per ton of boat displacement.
Virtually every solar panel vendor describe when a charge controller is needed, based on panel and battery capacities.
Trolling motor manufacturers will tell you how much run time you should expect from what size battery for each model. Three seperate systems are exactly that.
Multiple small motors are generally less efficient, more complicated to get to work together and will probably cost more than the right sized motor.
There are deeper explanations for each of these answers, but they end up sounding like rocket science ;). Without the supporting detail, you can just take my word...
Let me know if you need anything else.
Eric
--- In electricboats@yahoogroups.com, Jeff Wright <jawright77@...> wrote:
>
>
> If you find it please contact me. Been on for a while, questions get hijacked by rocket science Want a Be's. Not much practical info for us everyday sailors after the first response or two. Have you consulted the Mayan Calender?
>
> To: electricboats@yahoogroups.com
> From: v_2jgree@...
> Date: Sun, 18 Jul 2010 18:44:18 +0100
> Subject: [Electric Boats] Keeping It Simple
>
>
> Hi, I have been a member of this group for a few weeks now, but am not getting the level of info I need. Does anyone know where I can get less technical info than discussions of the merits of different battery types, and amps drawn and similar?
>
> The type of info I want is answers to simpler questions such as the following:
>
> 1 Can I manage without a controller, and just switch a motor on or off the same as a vacuum cleaner or blender, maybe have a 6 volt supply available to give it a slower speed if needed?
>
> 2 If I use a solar panel to charge a 12volt battery, how do I prevent overcharging, or does it automatically never overcharge?
>
> 3 How do I set up a thrust bearing on the prop shaft?
>
> 4 Can I use multiple lower powered motors for inboard use, such as those used on electric bicycles?
>
> 5 What is the equivalent rate for HP of a gas outboard versus electric inboard - can I figure that I need 750 watts per HP, or does it not work like that, bearing in mind electric can be run overloaded?
>
> 6 Can I use, say, 3 Minn-kota type trolling motors of about 30 lb thrust to power a 26 foot sailboat, if so, how many minutes of running will I get assuming I have 3 separate 12 volt deep cycle batteries?
>
>
>
> I hope that there is somewhere where the simpler things can be discussed of where there is an FAQ that I can use.
>
> I have a 26 foot sailboat with a very old gas engine that I would like to dump rather than spend money on - I would prefer to spend it on a generator to charge the batteries. I have the sails for main power. But I don't know how to sail yet, and figure it will be safer with 'plan B' power available, such as gas or electric.
>
> Any help appreciated,
>
> Thanks,
>
> John
>
>
>
> --
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