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Homebuilt - Custom

1978
New Zealand

System at a Glance

This 1978 Custom is an electric Workboat / Utility from Homebuilt, powered by a 10 kW ePropulsion motor and a 20 kWh battery pack, offering a quiet and eco-friendly boating experience.

Length (LOA)9 m (29.5 ft)
Beam (BOA)2.5 m (8.2 ft)
Hull Draft1 m (3.3 ft)
Hull ConfigMonohull
Hull TypeDisplacement
Displacement2,500 kg (5,512 lbs)
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Boat Specifications

Overview

Make
Homebuilt
Model
Custom
Year
1978
Hull type
Displacement
Configuration
Monohull

Hull & Dimensions

Length overall
9.00 m
Beam overall
2.50 m
Beam at waterline
2.50 m
Draft
1.00 m

Weights

Displacement
2,500 kg
Motor & battery
243 kg
Total weight
2,743 kg

Electric Propulsion System

Motor

1 × I-10 Electric Inboard Motor

Total Power: 10 kW
I-10 Electric Inboard Motor

Batteries

2 × G102-100 Battery

Capacity: 20 kWh
G102-100 Battery 1
G102-100 Battery 2

Propeller

Custom Prop

Performance Tests

Test details

Test date
2025-11-20 22:02:00
Testing personnel
Adam Wrightson
Persons onboard
2 (total 80 kg)
Location
Auckland, New Zealand
Temperature
16 °C
Weather
Fine , light winds

Recorded speed

Actual speed versus power for test 1 Recorded measurements are listed in the test results table. 0 0 2.5 2 5 4 7.5 6 10 8 Speed (knots) Power (kW)

Test results

Top Speed6.2 knots
Cruising5 knots
Estimated Range13–36 nm
PowerActual speedRuntime*Range*Energy use
2.5 kW 4.4 knots 8h 12m 36.1 nm 0.57 kWh/nm
3 kW 4.6 knots 6h 50m 31.4 nm 0.65 kWh/nm
4 kW 5 knots 5h 07m 25.6 nm 0.8 kWh/nm
5 kW 5.4 knots 4h 06m 22.1 nm 0.93 kWh/nm
6 kW 5.6 knots 3h 25m 19.1 nm 1.07 kWh/nm
7 kW 5.9 knots 2h 56m 17.3 nm 1.19 kWh/nm
8 kW 5.9 knots 2h 34m 15.1 nm 1.36 kWh/nm
9 kW 6.1 knots 2h 17m 13.9 nm 1.48 kWh/nm
10 kW 6.2 knots 2h 03m 12.7 nm 1.61 kWh/nm

Actual speed is recorded during the test. Energy use, runtime and range* are calculated from the readings and nominal battery capacity; runtime and range do not account for reserve capacity.

Interested in this Boat?

This Homebuilt Custom was listed by Evocean NZ, the official ePropulsion Distributor for New Zealand

Reach out for performance details, configuration advice, or to locate a nearby dealer.