User's Guide

● If starting the system in temperatures below 32ºF (0ºC), the system will not start for a
few minutes while the Battery Pack heats to an acceptable operating temperature. The
Throttle screen will show a message indicating the reason for the delayed start.
● Power is limited when in reverse to prevent accidental or excessive power when
reversing, which could be dangerous and cause certain boat hulls to be swamped.
5.3 Maximizing Efficiency
The Throttle display screen shows the Watt-hour per mile (Wh/mile) consumption of the Pure
Outboard system. The lower the Wh/mile value, the more efficiently the system is operating.
For planing hulls
Planing hulls, which rise and travel level with the water when sufficient power is applied, operate
most efficiently in two speed bands: below displacement speed and above minimum planing
speed.
● Displacement speed is calculated based on the boat’s waterline length, and is a speed in
nautical miles per hour (knots) equal to 1.34 multiplied by the square root of the boat’s
waterline length in feet. For a planing hull powered by the Pure Outboard, this is typically
between 4.3-6 knots (5-7 miles per hour) depending on the length of the boat. When
displacement speed is exceeded, the boat will appear to be climbing up the back of its
bow wave.
● Minimum planing speed: the minimum speed of travel at which the boat is on plane.
The speeds in between displacement speed and minimum planing speed are very inefficient for
travel and should be avoided or minimized in order to preserve and optimize battery power.
For displacement hulls
For displacement hulls, which move through the water by pushing the water aside and are
designed to cut through the water with very little propulsion, low speeds are more efficient than
higher speeds, as the motor is operating at a lower power level.
5.4 Power Derating
Derating is a safety feature that prevents the system from operating at full power when the
Battery Pack(s) is (are) in a restricted or low state of charge, or are in an otherwise
compromised state which could cause damage to the system.
Single Battery Pack versus multiple Battery Pack configuration
The system’s maximum power when connected to only one Battery Pack is restricted to 20 kW.
When two or more Battery Packs are connected, then the full 25 kW is made available, subject
to the other derating conditions outlined in this section.
Derating due to low battery state of charge
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