Frequently Asked Questions
High Performance: full torque starting at zero RPM
Almost No Noise
Electric outboard motors have been around since about 1870, even longer than electric cars. But this is the first electric outboard system to perform better than the gas outboards it replaces. To achieve this, the Pure Watercraft team designed each of the key components to be perfectly matched, and take full advantage of the latest innovations in motors, batteries, and power electronics.
The Pure Outboard can be installed on any boat that would use a gas outboard between 9.9 and 50 HP.
If you can get up on plane with a 40 hp conventional outboard, then you should be able to get up on plane with the Pure Outboard. You’ll likely be able to plane more quickly, because the Pure Outboard delivers maximum torque even at the lowest RPM, while the gas outboard only gets up to maximum torque near wide-open throttle.
Our electric outboard provides up to 25 kW of output power. We use a high-efficiency propeller running at about half the RPM of a typical gas outboard, which allows our system to provide about 30% more propulsion than a conventional outboard of the same power level. So our 25 kW system, which is 33.5 HP, provides the propulsion of a conventional motor running at about 45 HP
- Range depends on the hull, propeller, speed, and number of battery packs.
- Fishing: a bass pro competed in (and won) an all-day bass tournament on a small lake in California using 10 kWh (57% of two battery packs), using a Lund Fury 1600.
- Pontoon boating: an 18′ pontoon boat could cruise at 4 mph for 4 hours, with a few bursts at 18 MPH, with one battery pack.
- Coaching: a Still Water 25XL served a challenging 12 mile rowing practice of the NCAA Champion men’s team using 57% of a charge of one battery pack.
- In general, 1 battery pack equals ~ 2 gallons of gas range (or more at low speed).
Yes, up to ten battery packs can be connected, simply connecting each additional pack to the one before it with a single cable, so that they work in parallel to achieve the range and power you’d like.
Yes. Every component of the Pure Outboard is rated IP67 for water resistance, which means it can be submerged 1 meter below water for up to 30 minutes.
The Pure Watercraft Electric Outboard system is designed to be simple. You may place a pre-order without configuring anything. When it comes time to finalize your order for shipment, you choose how many battery packs, and whether you need a charger. (You may be able to share a charger between more than one Pure Outboard system.)
Your system will include:
– Pure Outboard
– Battery Pack(s)
– Throttle Assembly
– Charger (if selected)
– Connecting Cables
The battery packs are charged using the Pure Outboard Mobile DC charger, which can plug into any 120V or 240V outlet. The charger can be kept on the trailer, in the garage, or on the boat – wherever is most convenient for you. It will recharge a boat from half to full charge at 120V in 4.5 hours per battery pack, or at 240V in 90 minutes with 1 or 2 battery packs.
The Pure Outboard can be installed on any transom that complies with ABYC standards. The battery packs can be installed where there is room on your hull – for example, the gas tank area of a fishing boat, the middle pontoon of a pontoon boat, or behind the bench on a coaching launch. In areas in which we have deployed field technicians, our technician can perform the installation at your location.
The Pure Outboard can be installed on any transom with an ABYC standards.
The system weight is about 230 lbs, or 350 lbs for a two-battery system (outboard motor 105 pounds, each battery pack 118 pounds, plus cables and throttle). Compare this to 300 lbs for a conventional gas outboard system (40 HP gas outboard 214 lbs, marine starter battery 37 lbs, filled gas can 35 lbs, plus cables and throttle).
There is no scheduled maintenance, no winterizing, and no seawater loop to flush or impeller to replace. The gears are always engaged (the motor runs in reverse when the outboard is in reverse), so there is no shifting and therefore no chipped gears.
No, our system can only be used with our own battery pack. We do this for several reasons: 1) we optimize the performance of the system and provide accurate information about remaining range, 2) a set of lead-acid batteries that would reach our target voltage would be extremely heavy and prone to charge imbalance, and most importantly, 3) we can provide better safety controls when all the components are designed together and communicate with each other.
We designed and built our own battery pack, using small-cell lithium-ion batteries from a top-tier supplier (18650s, the same size used in the Tesla Model S and X). To preserve battery life, our battery packs include active thermal management, to ensure that they’re kept in a temperature range that optimizes for performance and long life.
The Pure Battery Pack should last 10+ years or 1500 full cycles (full charge/discharge). Batteries can also age, so a battery pack that hasn’t used all its cycles may still lose capacity over about 10 years. Note: we define the end of the battery’s life as the moment it falls below 70% of its original capacity, even though it’s still usable at its lower capacity.
Surveys of electric car owners show that those with actively thermally managed battery packs experience very long battery life. In boats, there are few examples of batteries that are properly thermally managed. Pure Watercraft’s is. This is the key factor that drives the cost of a boat outing, and should be among the key factors that a buyer considers when choosing a system.
The Pure Outboard should last more than ten years with daily leisure or commercial use.
12V auxiliary power (up to 10A) is provided for accessories.
To keep our battery packs in the right temperature range, we use a liquid cooling system that pulls heat out of the cells and exhausts the heat into the air. It also warms the batteries in very cold conditions.
The Pure Watercraft battery pack is compact (14.75″ x 22.75″ x 9″) and can be stowed in the center console, under the seats, or where the gas tank would normally go, depending on how you’d like to distribute the weight. The cable receptacles are at an angle, to minimize the additional space needed for cable routing.
You’ll cut your fuel cost by about 75% when switching from a gas outboard to the Pure Outboard.
We use a single cable type with an easy push-button release. Each battery pack has two cable receptacles, and each battery is connected to another using a single cable. When you’ve connected all the battery packs together, there is one free receptacle at each end. One of these connects to the outboard, and the other is used to plug in the throttle.
The Pure Outboard is up to 70% efficient, while typical electric outboard motors range from 35% to 55% efficient. Gas outboards are 5-15% efficient, and electric trolling motors are 18-22% efficient. While “efficiency” isn’t the end goal, it’s the way to achieve low cost, light weight, and high performance.
The Pure Outboard (50 HP equivalent) addresses the biggest segment of boating, and can power practical fishing boats, pontoon boats, sports coaching launches, and yacht tenders. Making a bigger electric outboard isn’t the big challenge; making a battery pack achieve an attractive cost and weight is. We’re committed to making products that real people can afford and use. As batteries improve their energy density and cost, we’ll follow closely with products that make sense.
With the rapid evolution of electric cars, EV technology has just become mature enough to make electric outboards a better choice than gas outboards. Electric motor and battery technologies are the two key enablers driving electric vehicle development, and boating has always benefited from vehicle development, and vice-versa.
Everything that uses energy has an environmental impact, but using the Pure Outboard minimizes the environmental impact of a boat.
A Pure Battery Pack contains about 200g of cobalt, which is an environmentally unfriendly element to mine. But it replaces the use of about 2,000 gallons of gasoline in an outboard motor, which would cause the same carbon monoxide, oxides of nitrogen, and hydrocarbon pollution of 430 cars over their entire lifetimes, not to mention 40 tons of CO2.
Fishing boat: in a typical 17′ aluminum fishing boat, with 2 people aboard, we would expect top speed fo 24 MPH
Pontoon boat: in an 18′ aluminum pontoon boat, with 6 people aboard, we would expect top speed of 18 MPH
Sports coaching launch: in a 27′ catamaran style coaching launch, with 1-2 people aboard, we would expect top speed of 21 MPH
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