+1
On 11/03/2016 15:31, mike@electricyachtssocal.com [electricboats] wrote:
>
> Our projections also show that based on the assumptions you would be
> able to push into a 10 to 12kts headwind for about 2 hours with a
> 14.4kWh battery bank using AGM batteries and a little better with
> LiFePO4 batteries.In calm seas the same battery pack would push the
> boat at 4kts for over 5 hours.The rule of thumb of double the power
> for every knot is very predictive.
>
> To your question of will an inexpensive genset mounted on the deck
> (all the portable systems must be) push the boat, the answer is
> yes.The issues is for how long before their low cost system would fail
> is a guess.They would likely be a good temporary solution for the
> occasional longer range cruise and serve you well.Be prepared to sail
> and be careful of the fuel for the motor as gas varies and has a shelf
> like.
>
> There are many obvious benefit to having an electric auxiliary motor
> on a sailboat.In all aspects it is better except for one, range.The
> reality of electric propulsion today is that when removing a diesel
> and having the same weight in as weight out, you will see a
> significant reduction is range.Range for an electric with a lead acid
> based battery system (AGM or TPPL) would be very much the same as
> having a 1.5 to 2.5 gallons of diesel for a diesel powered boat.You
> would likely increase the like for like to about 2.5 to 3.5 if
> installing Lithium batteries.
>
> So the question is, would you leave your slip/mooring/anchorage with
> the limited range of Electric.If yes, than go electric.If you are
> comfortable to leave your slip/mooring/anchorage with the knowledge
> that you have a non-marine genset that would expend you range at
> modest speeds then, again electric is a good solution.If sailing plans
> include significant motoring due to time constraints or skill, than
> you may want to spend the money and live with the diesel until battery
> technology allows you to go electric.
>
> Mike, Electric Yachts of California/Pacific
>
--
-hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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