marine electric propulsion rethinking energy, motion, space, & time on your boat
TRANSCRIPT
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MARINE ELECTRIC PROPULSION
Rethinking Energy, Motion, Space, & Time On Your Boat
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Perfect Propulsion System• Manufacturer
would pay you • Infinite speed• No pollution; it
removes pollutants wherever it goes
• Cures athlete’s foot, ED & psoriasis
• End wars, turns debts into surpluses
Sorry, Can’t Do… But Can We Improve Boat Propulsion With 21st Century Tech? YES!
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Back to Basics: Getting A Boat Moving
Push Throughthe Water… Displacement
Skim On Top… Planing
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Today’s Focus: Displacement
Planing Hulls? Some Other Time.
WHAT WE NEED – A JET OF WATER MOVING AFT
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Another Way…Jet Engines!!
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Seriously…What Propellers DoGRAB THE WATER, PUSH IT AFT
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How Propellers Do It?FEED THEM TORQUE
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Isn’t This Presentation About Electric Propulsion?
WHERE ARE THE AMPS & VOLTS?
Not Yet…Soon
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Prop PropertiesTo Push More Water• More Blades• Larger Diameter• More Blade Angle (Pitch)• Spin Faster
To Push Less Water• Fewer Blades• Smaller Diameter• Less Pitch• Spin Slower
Props Don’t Care What (or who)Is Turning Them
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Boat Properties ILess Power to push• Longer waterline
length• Less weight• Less beam• Fin keel• Less Speed
Boats Don’t Care What Is Turning Their Props
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Boat Properties IIMore Power to push• Shorter waterline
length• More weight• More beam• Full Keel• More Speed
Boats Don’t Care Who Is Turning Their Props
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What You Use To Turn The Prop Shaft Is Secondary;
Your Boat’s Design, Weight & Speed Drive The “Power Equation”
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Even If You Have These Guys…
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What A Prop Really Wants
From 0 to 1 knot• Prop has to overcome
inertia of still water• Must establish
moving jet, but it need not be fast
• Needs lots of torque to do it
• RPM change is small
Consider a Displacement Hull Vessel With a Maximum Operating Speed of 6 Knots Under Power
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What A Prop Really Wants
From 5 to 6 knots• Inertia is not an
issue; water jet is already moving
• Prop must accelerate the moving water jet
• Torque increment is small
• RPM change is huge
Consider a Displacement Hull Vessel With a Maximum Operating Speed of 6 Knots Under Power
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Props Want High Torque @ Low RPM, High Speed @ High RPM…
…Which Is What Electric Provides
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Now Consider A Diesel Engine• Low Torque @ Low RPM• Torque Catches Up @ High RPM• Must be OVERSIZED to address mismatch• This is why so little happens in the first
third of your throttle’s arc of travel
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Knock-On Effects Of Oversized Diesel Engines In Sailboats
• When diesels perform best:– At full design temperature, which
means…– At or near full throttle most of the time
• On sailboats, they run intermittently at various throttle settings– “Wet Stacking”– Incomplete fuel combustion– More maintenance, shorter life
• Not easy to “fine tune” prop thrust
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Deeply Conflicted Diesels
• Propulsion is not the diesel’s only job
• It also has to spin its alternator for battery charging
• Easy in the old days…not much power needed
• Today…different story
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“What Is My Purpose In Life?”
• Propulsion or Power Generation?• Do you run your diesel in neutral to
charge your batteries?• Let’s use a 27 hp diesel as an
example…it’s equivalent to about 20 kW (before losses)
• You upgraded to a 200 amp alternator
• Call it 14 volts – that’s 2.8 kW max• Diesel is grossly under-loaded!
…Your diesel engine keeps asking itself
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Recap – Diesel Issues on Sailboats• Mismatch in torque curve → oversized diesels• Mismatch in usage for long, trouble-free life– Diesel likes to run hot most of the time– Sailboat needs intermittent use, often at low load
• Conflict: Diesel is asked to push the boat and make electricity too – totally different uses
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…While Introducing No New Ones, Right?
Electric Propulsion Solves All Of These Problems….
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We Wish. Electric DOES Offer: • A streamlined way to organize energy
generation, storage and use• A highly modular approach – easy to mix and
match components at various price and performance levels
• A set of trade-offs that make it right for some and not for others
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With Electric, Propulsion Is Just Another Load
Energy Sources• Dockside Power• On-Board
generator• Solar Panels• Wind generators• Fuel Cells• Regeneration
under sail
Energy Storage• Lead-Acid
Batteries– Golf Cart– AGM’s– Thin Plate Pure
Lead AGM
• Lithium Ion– LiFePo4– LiMn
• NiFe
Energy Users (Loads)• Propulsion
Motor• Fridge• Air Conditioning• Windlass• Nav & Comm
Instruments• Lights & Fans• Pumps• TV, PC, Tablets
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…So Treat It Like Any Other Load
• How much power does it need?• For how long?• Always at max power when it’s on?
Probably not, most of the time• Add its load to all the others• Compare with energy storage capacity• Factor in contributions from sources• Size the storage and the sources such
that the storage always has a reserve
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…Just Like They Do In:• Cruise & Navy Ships• Subs• Diesel Locomotives
In fact, small craft, with their diesel engine-transmission drives, are the outliers
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Wait A Minute…• Some of the sources are AC, others DC• Some of the loads are AC, others DC• Now add electric propulsion…• it’s 48 Volts DC, 72, 96 or more• Can’t mix and match, Right?
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Actually…• AC to DC: rectification• DC to AC: inversion• DC voltage to a different voltage: conversion• All of these are easier, better, cheaper today:– Many manufacturers and products to choose from– Off-the-shelf, proven technology, mass-produced
components, reliable, efficient, affordable
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So…• You can focus on:– Energy coming in– Energy stored– Energy going out
• Let geeks like me worry about:– AC-DC & DC-AC
transformations– DC-DC voltage matching– Controls– Monitoring & Display
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The Result• Daysailers (no generator): – Go out any time; no winterizing in cold regions– No outboard or diesel engine maintenance– Quiet, precise control, easier handling
• Cruisers (with generator)– Much more effective use of diesel engine; low-
load operation nearly eliminated– With DC-DC converter, one generator charges both
propulsion batteries & house batteries – Quiet (when gen’s off), precise control, etc.
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RECAPThanks to recent technology advances,
small craft can feasibly be powered electrically, like large vessels and
locomotives, with lots of benefits and some drawbacks. For many boats and
owners, the case for electric is compelling.
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FOR MORE INFO
www.annapolishybridmarine.com
David M. DiQuinzio PE443 924 4484
THIS PRESENTATION CAN BE VIEWED ATwww.annapolishybridmarine.com/
marine-electric-propulsion-presentation.php