Be Well,
I've built VFD drives, too, but always AC from line current. You won't need a gear reduction since they deliver full torque at all rpms. Like someone else said, used equipment is good. The motor and VFD unit I installed last came from eBay, both new, and at a fraction of the cost of wholesale. Most units come with programmable features like upper and lower rpm limits, soft start/stop, braking, etc. The weak link in a boat system will be the input potentiometer. Between moisture and frequent speed changes they'll wear out quickly. I'd look for a digital input device, a moisture proof industrial pot (do they exist?), or install a backup pot.
--- In electricboats@yahoogroups.com, "kjshepherdca" <shepherdkevinj@...> wrote:
>
> I installed a VFD (variable frequency drive $400 )on a convayer at the plant yesterday and I was thinking that with a used 3 phase motor 3 or 5 HP($100?), a pot and a gear reduction one could build the cheapest drive possible . The battery bank would be nom.288 vdc. Lithium probably but at 2+ amps per horsepower any small battery could perform 24 X 12v . Any one know the voltage of a Prius ? Im sure there is a wrecked one by now.Of course we must be safe but I believe that industry will lead us down this path
> Kevin Shepherd
> E/SV Green
>
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