Build Your Own Electric Machine

E-Bike & Electric Motorcycle Build Guide — Camytrade International

Camytrade International

E-Bike & Electric Motorcycle Build Guide

Build Your Own
Electric Machine

Step-by-step interactive guide. Choose your build type to get started.

Electric Bicycle

Convert any bicycle or build from scratch. Hub motor or mid-drive. 36V to 72V. 250W to 1500W.

Electric Motorcycle

Full performance EV motorcycle build. 72V to 96V systems. 3000W to 10000W hub motors.

Electric ATV

Convert gas ATV to electric. 48V to 96V systems. 5000W to 20000W. Off-road performance.

Electric Sea-Doo

Convert gas PWC to electric. 72V to 96V systems. Waterproof build. Silent, zero-emission riding.

Introduction

Building an Electric Bicycle

Whether you're converting an existing bicycle or building from scratch, this guide walks you through every component, every connection, and every step. Two main approaches: hub motor kit (easiest) or mid-drive kit (more efficient, better hill climbing).

Hub Motor vs Mid-Drive

Feature	Hub Motor	Mid-Drive
Installation	Easy	Moderate
Hill climbing	Good	Excellent
Efficiency	Good	Best
Maintenance	Low	Medium
Cost	Lower	Higher
Throttle only	Yes	PAS preferred
Best for	Commuter, flat roads	Hills, range

Voltage Systems

36V

Entry level

250–500W

48V

Standard

500–1000W

52V

Performance

750–1500W

72V

High power

1000–3000W

💡

Recommendation: 48V for most builds — best balance of speed, range, and parts availability. 52V for more punch on the same motor.

⚠️

Canadian regulations: E-bikes are limited to 500W motor and 32 km/h assisted speed for road-legal use. Builds above this require registration and insurance as a motor vehicle. Check provincial rules before building.

What You Need

E-Bike Components

A complete e-bike build requires these core components. Everything is available from Camytrade — hub motor kits include motor, controller, throttle, PAS sensor, and display in one package.

⚙️

Hub Motor

250W–1500W / 26"–29"

Rear or front wheel. Direct-drive (fast, regen) or geared (lightweight, quiet). BLDC brushless, 3-phase.

📡

Controller

36V/48V/52V/72V

KT, Lishui, or sine wave controller. Matched to motor voltage and wattage. FOC sine wave = smoother, quieter.

🔋

Battery Pack

36V–72V / 10Ah–30Ah

Lithium NCM or LiFePO4. Downtube, rear rack, or triangle frame mount. Always match voltage to controller.

🖥️

Display / Computer

LCD or LED panel

Shows speed, battery level, PAS level, odometer. SW102, 750C, 860C — depends on controller brand.

🔄

PAS Sensor

8 or 12 magnet disc

Pedal Assist Sensor — detects pedalling and activates motor. Mounts on bottom bracket. Required for road-legal builds.

🎮

Throttle

Thumb or half-twist

Voltage signal throttle (0.8V–4.2V). Thumb throttle easiest to install. Half-twist feels more natural for moto riders.

🛑

Brake Cutoff Levers

Magnetic or hydraulic

Cuts motor power when brakes applied. Safety critical — always install. Magnetic reed switch type most reliable.

🔌

Charger

Matched to pack voltage

2A–5A standard. 48V pack = 54.6V charger (13S Li-ion). Always verify charger voltage before connecting.

💡

Lights (optional)

Controller-powered

Many controllers have a light output wire. 6V or 12V LED front and rear — powered directly from the controller.

Motor & Controller

Choosing Motor & Controller

The motor and controller must be matched in voltage, current, and phase wire configuration. Mismatched pairs will damage the controller or underperform. Always buy as a matched kit when possible.

Motor Selection Guide

Motor Type	Power	Best Voltage	Speed	Best For
Geared Hub (250W)	250W	36V	25–28 km/h	Legal commuter
Geared Hub (500W)	500W	48V	32–38 km/h	City riding
Direct Drive (1000W)	1000W	48V/52V	40–50 km/h	Speed + regen
Direct Drive (1500W)	1500W	52V/72V	50–65 km/h	Performance
Bafang BBS02 (750W)	750W	48V	35–45 km/h	Hills, trail
Bafang BBSHD (1000W)	1000W	48V/52V	45–55 km/h	Max mid-drive

Hall Sensor Wires — 5 Signal Wires

Wire	Colour	Function
Hall Power	Red	+5V supply to sensors
Hall Ground	Black	Ground reference
Hall A	Yellow	Position signal A
Hall B	Green	Position signal B
Hall C	Blue	Position signal C

Phase Wires — 3 Power Wires

Wire	Colour	Notes
Phase A	Yellow	High current — use thick wire
Phase B	Green	High current — use thick wire
Phase C	Blue	High current — use thick wire

⚠️

If motor runs backwards, swap any two phase wires. If motor stutters, try different hall/phase combinations.

Power Source

E-Bike Battery Selection

The battery is the most expensive component of your e-bike build. Match voltage to your controller exactly. Capacity (Ah) determines your range. More Ah = more range but more weight.

Battery Voltage Reference

Nominal V	Cell Config	Full Charge	Cutoff	Charger	Range (10Ah)
36V	10S	42.0V	30.0V	42.0V	35–55 km
48V	13S	54.6V	39.0V	54.6V	45–70 km
52V	14S	58.8V	42.0V	58.8V	50–80 km
72V	20S	84.0V	60.0V	84.0V	70–110 km

🔴

Critical: A 48V controller must use a 48V battery (13S, 54.6V full charge). Never connect a 52V battery to a 48V controller — overvoltage will destroy the controller MOSFETS immediately.

Battery Mounting Options

Downtube Mount

Most common. Bottle cage or integrated frame mount. Keeps weight centred and low. Best for conversions.

Rear Rack Mount

Pannier-style battery on rear rack. Heavier rear end but easy to remove. Common on cargo bikes.

Triangle Frame Pack

Custom pack built to fit inside the frame triangle. Best weight distribution. Requires custom pack build.

BMS — Required for All Packs

The BMS (Battery Management System) protects your cells from overcharge, over-discharge, and short circuits. Never run lithium cells without a BMS.

Voltage	BMS S-count	Min Current
36V	10S BMS	30A continuous
48V	13S BMS	30A continuous
52V	14S BMS	40A continuous
72V	20S BMS	60A continuous

Connections

E-Bike Wiring Diagram

        ━ Battery +/−
        ━ Phase wires (A/B/C)
        ━ Hall sensor wires
        ━ Throttle / PAS / Display
        ━ Brake cutoff
      

🔌

Always connect battery LAST after all other wiring is complete. Double-check polarity before connecting battery to controller.

Step by Step

E-Bike Build Procedure

Choose & Prepare Your Bicycle Frame

Hub motor kits work with most standard frames. Check dropout width — rear hub motors require 135mm quick release or 142mm thru-axle. Mid-drive kits require 68mm or 73mm bottom bracket shell.

✓ Steel and aluminium frames both work. Carbon frames need special care with torque arms.

Lace the Motor into the Wheel (Hub Motors)

If your kit doesn't include a pre-laced wheel, the motor hub needs to be laced into your rim with spokes. Take it to a bike shop if you're not experienced — improper lacing causes wobble and spoke breakage.

⚠️ Most hub motor kits come pre-laced. Always check spoke tension after 50km of riding.

Install Torque Arm (Hub Motors)

A torque arm bolts between the motor axle and the frame dropout. This is CRITICAL — without it the motor can spin in the dropout under hard acceleration or braking, cutting through the phase and hall wires.

🔴 Never skip the torque arm. This is the #1 cause of hub motor installation failures.

Install Bottom Bracket Motor (Mid-Drive)

Remove existing bottom bracket. Thread in the Bafang BBS motor unit using the supplied lockring tool. Torque to spec (40–50Nm). Install chainring with the correct number of teeth for your gear range.

Mount the Controller

Zip-tie or strap the controller to the frame — inside the triangle or under the downtube. Ensure it's protected from water. Controllers generate heat — don't enclose them completely. KT controllers have a waterproof rating, but avoid full submersion.

Connect Phase & Hall Wires

Match colours: Yellow-Yellow, Green-Green, Blue-Blue for both phase and hall wires. Most kits use standardised colour coding. Secure connectors with electrical tape or heat shrink.

⚠️ If motor runs backwards after first test, swap any two phase wire connectors. Do NOT swap hall wires to fix direction.

Install PAS Sensor

Bolt the disc magnet to the crank spider or pedal axle. Mount the sensor to the chainstay with a 3–5mm gap between sensor and magnets. Route cable to controller.

Install Throttle & Brake Cutoffs

Mount throttle on handlebar. Install brake lever cutoffs — replace or add to existing brake levers. Route cables to controller. Test cutoff function before connecting battery.

Mount Display

Clamp display to handlebar. Connect the 5-pin or 6-pin display cable to controller. Most KT/LCD3 displays plug directly in. Secure cable routing along frame with zip ties.

Mount Battery & Connect

Secure battery in its mount. Route battery cable to controller. CHECK POLARITY. Connect battery connector — you should see the display illuminate. Do not connect with the motor spinning.

🔴 Reverse polarity will instantly destroy the controller. Double-check red=positive, black=negative before connecting.

First Power-On Test

With wheel lifted off ground: power on, check display reads correct battery voltage. Test throttle — wheel should spin smoothly in correct direction. Test PAS by pedalling. Test brake cutoffs — motor must stop immediately when brakes applied.

Cable Management & Weatherproofing

Route all cables neatly along frame. Use spiral wrap or braided sleeve. Apply dielectric grease to all connectors. Seal any entry points on the frame with rubber grommets. Apply Velcro straps for controller and battery. Take for a slow test ride in a safe area.

Performance Calculator

E-Bike Range & Speed Estimator

Your Build

Battery Voltage

Capacity (Ah)

Motor Power (W)

Rider Weight (kg)

Results

720Wh

Pack Energy

V × Ah

55km

Est. Range

Mixed riding

38km/h

Est. Top Speed

Motor limited

10A

Avg Draw

At voltage

72min

Runtime

Full throttle

14AWG

Min Wire

Phase wires

What You Need

Tools & Materials

Tools

🔧

Spoke Wrench

For wheel truing after lacing

RECOMMENDED

🔩

Lockring Tool (Bafang)

Required for mid-drive install

REQUIRED mid-drive

🔌

Multimeter

Verify voltage, check polarity

REQUIRED

🔥

Heat Gun + Heat Shrink

Waterproof all connectors

REQUIRED

✂️

Wire Stripper / Crimper

AWG 10–22 range

REQUIRED

🔥

Soldering Iron

For battery connector install

RECOMMENDED

🔦

Zip Ties (100 pack)

Cable management

REQUIRED

🧰

Allen Key Set (metric)

2mm–10mm for all mounting

REQUIRED

Introduction

Building an Electric Motorcycle

An electric motorcycle conversion or scratch build is a serious project requiring mechanical skill, electrical knowledge, and the right components. This guide covers 72V hub-motor builds — the most popular configuration for DIY e-moto projects producing 3000W to 10000W.

72V System Reference

84V

Full Charge

20S × 4.2V

72V

Nominal

20S × 3.6V

60V

Cutoff

20S × 3.0V

10kW

Max Power

Hub motor

Power vs Performance

Motor	72V Speed	Range (40Ah)	Use
3000W hub	80–100 km/h	100–140 km	Street
5000W hub	100–120 km/h	80–110 km	Performance
8000W hub	120–140 km/h	60–90 km	Sport
10000W hub	130–150 km/h	50–75 km	Max power

⚠️

Registration required: Any motorised two-wheeler above 500W in Canada must be registered as a motor vehicle, insured, and the rider must hold a valid motorcycle licence. Build legally and safely.

What You Need

Electric Motorcycle Components

⚙️

Hub Motor

3000W–10000W

QS Motor 273, QS138, or equivalent. Direct drive rear wheel. 17" or 18" rim for motorcycle fitment. 3-phase BLDC.

📡

Controller (FOC)

72V / 100A–400A

VOTOL EM-150/200/300, Fardriver, Sabvoton, Kelly. Sine wave FOC for smooth power delivery. Must match motor KV rating.

🔋

72V Battery Pack

20S NCM / 40Ah–150Ah

Lithium NCM prismatic or cylindrical. 20S configuration = 72V nominal / 84V full charge. BMS required — JBD, DALY, or ANT.

🖥️

Display / Speedometer

VOTOL app or LCD

VOTOL controllers use Bluetooth app. Standalone LCD speedometer for speed/SOC display. Calibrate for wheel circumference.

🎮

Twist Throttle

0–5V Hall throttle

Hall-effect throttle — more reliable than resistive type. Full twist grip moto-style. Must match controller input voltage range.

🛑

Brake System

Hydraulic disc

Front and rear hydraulic disc brakes minimum for 3000W+. Brake cutoff switches required for all builds. 320mm front disc recommended for 5kW+.

🔌

84V Charger

84.0V CC/CV

Verified 84.0V output charger for 20S lithium pack. 5A standard, 10A fast charge. Always verify output voltage before use.

⚡

ANL Fuse

150A–400A / 100V+

On B+ wire as close to battery as possible. Rate at 1.5× peak current draw. Must be rated for system voltage.

🔑

Key Switch

12V or direct battery

Controls power to controller enable line. Anti-theft. Some builds use a kill switch relay. Always include a lockable key switch.

📍

GPS Tracker

SIM-based

Highly recommended — hidden SIM GPS tracker for theft recovery. Wired to ignition or dedicated power. Essential on a custom build.

Power Plant

Motor & Controller Matching

The controller must be matched to the motor's KV rating, phase current, and voltage. A mismatched controller will either underperform, overheat, or destroy the motor windings. Always buy motor and controller as a verified pair.

VOTOL EM Series — 72V Builds

Parameter	3000W — EM-100S	5000W — EM-150S	10000W — EM-200S
Battery Voltage	72V (84V max)	72V (84V max)	72V (84V max)
Rated Phase Current	100A	150A	200A
Peak Phase Current	200A	300A	400A
Motor Poles Setting	Match motor (e.g. 23)	Match motor	Match motor
Flux Weakening	Mild (5–10%)	Moderate (10–20%)	Aggressive (20–30%)
Speed Limit (RPM)	Set per wheel size	Set per wheel size	Set per wheel size
Undervoltage Cutoff	60.0V	60.0V	60.0V
Overvoltage Limit	88.0V	88.0V	88.0V
Regen Braking	Yes — adjustable	Yes — adjustable	Yes — adjustable
Programming	Bluetooth app (Android)	Bluetooth app	Bluetooth app
Throttle Input	0–5V Hall throttle	0–5V Hall throttle	0–5V Hall throttle

📱

VOTOL App Setup (Android): Download "VOTOL Controller" from Play Store. Connect via Bluetooth. First set Battery High Voltage (88V), Battery Low Voltage (60V), then set motor pole pairs, then throttle calibration. Always save settings after changes.

Fardriver ND Series — 72V Builds

⚡

Fardriver advantage: Superior FOC algorithm, better low-speed torque, and more precise tuning than VOTOL. Preferred by serious builders. ND72530 and ND96530 are the most popular 72V models.

Parameter	3000W — ND72260	5000W — ND72530	10000W — ND721200
Battery Voltage	72V nominal	72V nominal	72V nominal
Max Battery Voltage	84V	84V	84V
Rated Phase Current	260A	530A	1200A
Cont. Battery Current	80A	150A	300A
Flux Weakening	Auto-adaptive FOC	Auto-adaptive FOC	Auto-adaptive FOC
Overvoltage Cutoff	88V (set in app)	88V	88V
Undervoltage Cutoff	60V (set in app)	60V	60V
Regen Braking	Yes — brake lever signal	Yes	Yes
Speed Sensor	Hall or encoder	Hall or encoder	Hall or encoder
Programming	Fardriver app (Android)	Fardriver app	Fardriver app
Anti-theft	Built-in	Built-in	Built-in

FARDRIVER KEY SETTINGS

Setting	Value
BatHighLim	88.0V
BatLowLim	60.0V
PhaseCurrentMax	Match motor rating
MotorPolePairs	Count motor poles ÷ 2
ThrottleHighV	4.0–4.5V
ThrottleLowV	0.8–1.0V
SpeedLimit	Set to legal/safe limit
RegenStrength	20–40% (start low)

FARDRIVER SETUP PROCEDURE

Download Fardriver app (Android). Enable Bluetooth.

Power controller with battery. Scan for device in app.

Set BatHighLim = 88V and BatLowLim = 60V first.

Set motor pole pairs. Count stator slots ÷ 6 for hub motors.

Calibrate throttle: turn throttle fully, tap "Learn Throttle Max" then release and tap "Learn Throttle Min".

Set speed limit. Start at 50% phase current for first test ride.

⚠️

Fardriver model naming: NDvoltagephase-current — e.g. ND72530 = 72V nominal, 530A phase current. Always buy the model rated for your motor's peak phase current requirement.

Spec	Value
Voltage	72V (84V max)
Phase Current	150A rated
Programming	Android app
Regen	Yes
Best For	3000W–5000W builds
Notes	Good mid-range option, wide support

Spec	Value
Voltage	72V (84V max)
Phase Current	300A peak
Programming	PC software (USB)
Regen	Yes
Best For	5000W–8000W builds
Notes	Very reliable, no smartphone needed

Phase/Hall Combo Finding

New motor+controller pairs often require finding the correct phase/hall wire combination. There are 6 phase combinations × 6 hall combinations = 36 possible combos. Use our VoltWrench Phase/Hall Finder tool to identify the correct combination systematically.

⚠️

Test at low throttle first. Wrong combo = motor jerks, stutters, or runs hot. Never run at full throttle until correct combo is confirmed.

Wire Gauges — 72V Moto Builds

Wire	3000W	5000W	10000W
Battery main	8 AWG	6 AWG	4 AWG
Phase wires	10 AWG	8 AWG	6 AWG
Hall wires	22 AWG	22 AWG	22 AWG
Throttle	22 AWG	22 AWG	22 AWG
Brake cutoff	22 AWG	22 AWG	22 AWG

72V Power Source

72V Battery Pack Guide

The 72V (20S) lithium pack is the heart of your e-motorcycle. Pack capacity directly determines range. For detailed 20S pack building instructions including BMS wiring, balance connector, and cell selection — see our dedicated 72V Battery Build Guide.

Pack Sizing by Use Case

Use Case	Min Capacity	Recommended	Est. Range	Approx Weight
City commuter (3kW)	30Ah	40Ah	100–140km	15–18kg
Mixed road (5kW)	40Ah	60Ah	100–130km	18–22kg
Performance (8kW)	60Ah	80Ah	90–120km	22–28kg
Max range (10kW)	80Ah	100–150Ah	120–200km	28–45kg

🔋

For full 20S pack build instructions — cell selection, BMS wiring, balance connector, and build steps — see the 72V / 84V NCM Battery Build Guide on camytrade.ca.

Connections

Electric Motorcycle Wiring Diagram

        ━ Battery B+/B− (via fuse)
        ━ Phase wires A/B/C
        ━ Hall sensor wires
        ━ Throttle / Display / Key
        ━ Brake cutoff switches
        ━ Charger C+/C−
      

⚡

72V is lethal. A 72V pack at full charge is 84V — enough current to cause cardiac arrest. Always disconnect battery before working on wiring. Use insulated tools. Never work alone.

Step by Step

Electric Motorcycle Build Procedure

Choose & Prepare Your Frame

Purpose-built e-moto frame or motorcycle conversion. Frame must accommodate battery pack (large central cavity), motor in rear wheel, and controller mounting. Check rear axle spacing — most hub motors require 135–155mm.

Lace Hub Motor into Motorcycle Rim

QS and similar motors come unlaced. Take to a moto wheel builder for 17" or 18" rim lacing. Specify correct spoke count and rim width for your tyres (typically 140/70-17 or 160/60-17 rear).

⚠️ Motorcycle wheel lacing is different from bicycle. Use a specialist — incorrect lacing can fail at speed.

Install Rear Wheel & Torque Arms

Install motor wheel into swingarm. Install BOTH left and right torque arms — this is critical on a motorcycle where rear wheel torque forces are much higher than an e-bike. Weld torque arms to frame if possible for permanent builds.

🔴 Single-sided torque arm will fail on a 3kW+ motorcycle build. Both sides mandatory.

Build & Install Battery Pack

Build or source your 20S NCM pack (see Battery Build Guide). Mount securely in frame with compression straps or custom battery box. Pack must be protected from water ingress and road vibration. Minimum IP54 weather rating recommended.

Mount Controller

Mount VOTOL/Fardriver/Sabvoton controller in a well-ventilated location — under seat or side panel. Controllers at 200A+ generate significant heat. Add heatsink compound between controller and any metal mounting surface. Secure with M6 bolts, use rubber vibration mounts.

Install ANL Fuse on B+

Mount ANL fuse holder on the B+ wire as close to the battery positive terminal as physically possible — within 15cm. Rate the fuse at 1.5× peak phase current. At 5kW/72V = ~70A average, use 150A fuse. At 10kW, use 250A fuse.

🔴 No fuse = no short circuit protection. A battery short without a fuse will cause immediate fire.

Connect Phase Wires

Connect motor phase wires (3 thick wires) to controller output. Use correct gauge — see wire sizing table. Use XT150 or Anderson SB connectors for 5kW+. Solder all connections and heat shrink. Route phase wires away from chain and moving parts.

Connect Hall Sensor Wires

5-wire hall connector: Red (+5V), Black (GND), Yellow (A), Green (B), Blue (C). Route through frame to controller. Keep hall wires away from phase wires — high current in phase wires causes interference in hall signal.

Install Throttle & Controls

Mount Hall-effect twist throttle. Wire to controller throttle input (3 wires: power, ground, signal). Install key switch in series with controller enable wire. Add brake cutoff switches to both brake levers — these must cut power immediately when brakes are applied.

Program the Controller

Connect via Bluetooth (VOTOL app) or PC software. Set: battery voltage limits (84V max, 60V cutoff), phase current limit, speed limit, throttle curve, regen braking strength. Always start with conservative settings for first test.

⚠️ Never run at max settings on first power-up. Start at 50% current limit. Increase gradually after confirmed correct phase/hall combo.

Phase/Hall Combination Test

With rear wheel lifted: apply minimal throttle. If motor stutters or jerks, try different phase wire combinations. There are 6 permutations. Once smooth rotation confirmed in correct direction, test hall wire combinations if needed. Document the correct combination.

First Ride Test

In a safe off-road area: test throttle response, brake cutoffs, regen braking, and top speed gradually. Check for unusual heat on controller, motor, or battery after 10 minutes. Check all connections for looseness or heat marks.

Final Assembly & Safety Check

Install fairings, covers, and panels. Final cable management — all wires secured away from moving parts, heat sources, and ground contact. Install GPS tracker. Verify all fasteners torqued. Document all controller settings. Register vehicle if required in your province.

Performance Calculator

E-Moto Range & Power Estimator

Your Build

Motor Power

Battery Capacity Ah

Riding Style

Results

2,880Wh

Pack Energy

90km

Est. Range

115km/h

Est. Top Speed

69A

Avg Current

150A

ANL Fuse

8AWG

Phase Wire

Equipment

Tools & Equipment

Required Tools

🔌

Insulated Multimeter

CAT III 1000V rated

REQUIRED

🔧

Torque Wrench

4–120Nm range

REQUIRED

💻

Laptop + Controller SW

VOTOL/Fardriver programming

REQUIRED

📱

Smartphone + BMS App

JBD/DALY/ANT monitoring

REQUIRED

🔥

Soldering Station

80W+ temp controlled

REQUIRED

✂️

Heavy Wire Crimper

AWG 4–10 hydraulic

REQUIRED

🧰

Insulated Tool Set

1000V rated — mandatory at 72V+

REQUIRED

🚒

CO₂ Fire Extinguisher

For lithium battery emergency

REQUIRED

🔬

Thermal Camera

Detect hot spots on first runs

RECOMMENDED

Electric ATV Conversion

Converting a Gas ATV to Electric

An electric ATV conversion replaces the gas engine, fuel tank, and exhaust with an electric motor, controller, and battery pack. The result is instant torque, zero emissions, near-silent operation, and low maintenance. Most gas ATV frames convert well — the heavy engine bay accommodates a large battery pack perfectly.

System Specs by ATV Size

ATV Class	Motor	Battery	Range
Youth (90–250cc)	5–8kW	48V 30Ah	40–60km
Mid (300–450cc)	8–15kW	72V 40Ah	50–80km
Full (500–700cc)	15–20kW	72V 60Ah	60–100km
Sport/UTV	20–30kW	96V 80Ah	70–120km

Electric vs Gas ATV

Feature	Electric	Gas
Torque delivery	Instant 0 RPM	Peak RPM only
Maintenance	Minimal	High
Noise	Near silent	Loud
Trail access	More areas	Restricted
Refuel time	1–4h charge	Minutes
Running cost	Very low	High

⚡

Best candidates for conversion: Yamaha Grizzly, Honda Foreman, Polaris Sportsman, Can-Am Outlander. Look for solid frame condition, working rear axle, and good suspension — the drivetrain is what you're replacing.

What You Need

ATV Conversion Components

⚙️

Electric Motor

5kW–30kW BLDC/PMSM

QS Motor 138, 273, or equivalent. Direct drive or chain/belt to rear axle. Must handle mud, water, and vibration — look for IP67 rating.

📡

Controller (FOC)

72V–96V / 200A–500A

Fardriver ND72530 or ND96530, VOTOL EM-200, Kelly KLS. Must handle high peak current for off-road climbs. Waterproof enclosure essential.

🔋

Battery Pack

72V–96V / 40Ah–100Ah

NCM prismatic pack. Fits in engine bay with custom battery box. IP65+ waterproofing mandatory. 20S (72V) or 26S (96V) configuration.

🔗

Adapter Plate

Custom CNC aluminium

Couples motor shaft to ATV drivetrain (chain, belt, or direct). Must be precision-machined for your specific motor and ATV transmission output.

🛡️

Waterproof Enclosures

IP65 minimum

Controller box, BMS enclosure, connector boots. ATVs get submerged, mud-packed, and pressure washed. Every electrical component needs waterproofing.

🖥️

BMS (20S or 26S)

JBD / DALY / ANT

Battery management system matched to pack voltage. 150A+ continuous for off-road use. Bluetooth monitoring recommended for diagnostics on the trail.

🎮

Thumb Throttle

Hall effect 0–5V

ATV-style thumb throttle. Waterproof Hall-effect type. Must match controller input range. Handlebar-mount with existing brake integration.

⚡

ANL Fuse + Contactor

250A–400A

Main fuse on B+ close to battery. High-voltage contactor (relay) for key switch control — prevents arcing on connect/disconnect at high voltage.

Drivetrain

Motor Mounting & Drivetrain

The biggest challenge in an ATV conversion is coupling the electric motor to the existing drivetrain. Three approaches: direct hub (replace rear axle hub), chain/sprocket, or belt drive. Chain drive is most common and reliable for off-road use.

Drive Options Compared

Type	Efficiency	Maintenance	Off-road
Chain drive	92–95%	Lube/replace	Excellent
Belt drive	95–98%	Low	Good
Direct hub	98%	Minimal	Best
Gearbox kept	85–90%	High	Excellent

Motor Mounting Tips

Weld or bolt a motor mount plate to the frame in the engine bay. Use 10mm steel plate minimum.

Align motor sprocket with rear axle sprocket. Misalignment causes rapid chain wear.

Use heavy-duty chain (520 or 530 pitch). Install chain tensioner for off-road use.

Waterproof all motor phase connectors with silicone potting or IP67 connectors.

Power Source

ATV Battery Pack

The engine bay of most ATVs offers excellent space for a large battery pack. A 72V 60Ah pack fits most mid-size ATVs. The battery must be sealed against water, mud, and vibration — this is the most critical part of an ATV build.

Battery Box Requirements

IP65 Minimum Waterproofing

Weld or fabricate an aluminium or steel battery box. Seal all penetrations with waterproof cable glands. Test with garden hose before installing pack.

Vibration Isolation

Mount battery box on rubber vibration isolators. ATV terrain sends severe shock loads into the frame — unsupported cells can have terminals crack.

Ventilation & Temperature

Small vent with IP-rated filter to prevent pressure buildup. NCM cells should not exceed 45°C continuous. Monitor with BMS temperature sensor.

Low Centre of Gravity

Mount battery as low as possible in the frame. Lowers centre of gravity vs the original gas engine — improves handling and rollover resistance.

⚠️

Never cross water deeper than your battery box without waterproof testing first. A flooded battery can cause immediate thermal runaway. Test box seal at 1m depth for 30 minutes before first water crossing.

Connections

ATV Wiring Overview

        ━ B+/B− main power
        ━ Controller signals
        ━ Phase wires
        ━ Hall sensors
        ━ Charger port
      

💧

Waterproof every connection. Use Anderson SB connectors with silicone boots, or Deutsch DT connectors. Never use standard automotive connectors on an ATV — they fail immediately in mud and water.

Step by Step

ATV Conversion Procedure

Strip the Gas Drivetrain

Remove engine, fuel tank, exhaust, radiator, carburettor/fuel injection, air filter, and all associated wiring. Keep the frame, suspension, brakes, wheels, steering, and 12V accessory wiring. Document everything with photos before removal.

Assess & Clean Frame

Inspect frame for cracks, rust, or damage after stripping. Repair and repaint mounting surfaces. Note exact dimensions of engine bay for battery box fabrication.

Fabricate Motor Mount

Weld or bolt 10mm steel motor mount plate into engine bay. Locate motor for optimal chain/belt alignment with rear axle sprocket. Use mock-up with cardboard first, then fabricate in steel.

⚠️ Have a welder with structural experience do this — motor mount failure at speed is catastrophic.

Fabricate Battery Box

Build waterproof battery enclosure from 3mm aluminium or 2mm steel. Include cable glands for all wire penetrations, vent with IP-rated filter, and drain plug. Test water seal before installing cells.

Install Battery Pack

Build or source your 72V NCM pack (see Battery Build Guide). Mount on vibration isolators. Route B+ and B− cables through waterproof glands. Install ANL fuse within 15cm of battery positive terminal.

Install Motor & Chain

Bolt motor to mount plate. Install sprocket on motor shaft with keyway and locking nut. Route chain from motor sprocket to rear axle sprocket. Set chain tension — 10–15mm slack. Install chain guard.

Mount Controller in Waterproof Box

Install controller in IP65 aluminium enclosure. Mount with thermal compound to enclosure wall for heat dissipation. Route phase wires and hall wires through waterproof glands.

Wire Everything

Connect phase wires (use Deutsch connectors). Connect hall sensor wires. Install throttle with waterproof housing. Wire key switch through contactor. Install brake cutoff switches on both levers.

Program Controller

Connect via Bluetooth app. Set voltage limits (84V max for 20S, 101V for 26S). Set phase current to 50% for first test. Confirm motor direction — ATV should move forward on throttle. Increase current limit gradually.

Waterproof All Connections

Apply silicone boots or self-amalgamating tape to every connector. Fill any voids with dielectric grease. Route all wiring away from moving parts, heat sources, and sharp edges. Secure with UV-resistant zip ties.

Test & Commission

Lift rear wheels off ground. Test at low throttle — check direction, brake cutoffs, BMS app readings. First ride on flat ground, check for heat on motor, controller, and battery after 10 min. Test water crossing only after full waterproof verification.

Equipment

Tools & Equipment

Required Tools

🔧

MIG/TIG Welder

Motor mount and battery box fabrication

REQUIRED

✂️

Angle Grinder

Frame prep and metal cutting

REQUIRED

🔩

Chain Alignment Tool

Critical for sprocket alignment

REQUIRED

🔌

Multimeter (CAT III)

Voltage and continuity checks

REQUIRED

💻

Controller App + Laptop

Fardriver / VOTOL programming

REQUIRED

🛡️

Deutsch Crimper

Waterproof connector crimping

REQUIRED

🔬

Thermal Camera

Check motor/controller heat

RECOMMENDED

🚒

CO₂ Extinguisher

Lithium fire safety

REQUIRED

Electric PWC Conversion

Converting a Gas Sea-Doo / PWC to Electric

An electric PWC conversion replaces the gas engine and jet pump drive with an electric motor coupled directly to the jet pump impeller. The hull, jet pump housing, steering, and seating all remain. The result is silent, fume-free riding with instant torque — perfect for lakes, harbours, and environmentally protected waterways.

System Specifications

72–96V

System Voltage

20S–26S NCM

15–30kW

Motor Power

Jet pump drive

60–100Ah

Battery

1–2hr ride time

IP68

Waterproofing

Full submersion

Compatible Hull Types

PWC Model	Hull Space	Pump Size	Notes
Sea-Doo GTX	Excellent	155mm	Best candidate
Sea-Doo RXT	Excellent	160mm	Large hull
Yamaha WaveRunner	Good	148mm	Popular choice
Kawasaki Ultra	Good	160mm	Large engine bay
Sea-Doo Spark	Tight	140mm	Small — challenging

⚠️

Critical difference from land vehicles: ALL electrical components must be IP68 rated or fully encapsulated. A PWC hull fills with water on capsize. Plan for full submersion of every component — not just splash resistance.

What You Need

Sea-Doo Conversion Components

⚙️

Electric Motor

15–30kW / IP68

High-power axial flux or radial PMSM motor. Must be fully sealed — consider liquid-cooled motors for sustained power. Direct couple to jet pump shaft.

🌊

Jet Pump (existing)

Keep original pump

The original jet pump impeller, housing, and nozzle all stay. Only the drive shaft coupling to the gas engine is replaced with the electric motor coupler.

📡

Waterproof Controller

IP67 / 72V–96V

Fardriver or VOTOL in IP67 enclosure, or potted controller specifically designed for marine use. Must handle sustained high current — PWC runs at high load continuously.

🔋

Marine Battery Pack

72V–96V / 60–100Ah

NCM or LiFePO4 pack in fully sealed, buoyant-rated enclosure. LiFePO4 is safer in marine environments — no thermal runaway risk if hull floods.

🔗

Motor-Pump Coupler

Custom CNC

Precision-machined coupler joins electric motor output shaft to jet pump driveshaft. Must handle 15–30kW torque transmission and be corrosion-resistant (316 stainless or aluminium 6061).

🖥️

Waterproof BMS

IP68 / 20S or 26S

BMS must be IP68 or encapsulated in waterproof resin. Marine-grade BMS with temperature cutoff essential — battery in hull can get warm in confined space.

🎮

Throttle (handlebar)

Original or marine Hall

Use original PWC thumb throttle lever if compatible, or marine-grade Hall throttle. Must be waterproof — fully submerged on capsize.

🔌

Charge Port (IP68)

Shore power connector

Waterproof shore-power charge inlet. Must seal completely when not in use. Locking cap mandatory. Mount above waterline on hull side.

Jet Pump Drive

Motor to Jet Pump Coupling

The jet pump on a PWC is driven by a straight driveshaft from the engine. The electric motor replaces the engine and couples to this same driveshaft or directly to the pump impeller shaft. Alignment is absolutely critical — even 0.5mm of misalignment will destroy the shaft seal and flood the hull.

Motor Selection for PWC

Motor Type	Power	RPM Range	Pros
Axial flux PMSM	15–30kW	3000–6000	Compact, high torque density
Radial hub motor	10–20kW	2000–4500	Available, proven
Marine induction	20–50kW	1500–4000	Rugged, water-cooled

💡

Jet pump impellers are optimised for 5500–8000 RPM. Your motor must reach this range at full voltage, or use a reduction gear (1:1.5 to 1:2 ratio).

Shaft Seal — Critical Detail

The original mechanical shaft seal must be replaced or refurbished — it seals where the driveshaft enters the hull.

Motor must be precisely aligned to shaft centreline — use a dial indicator, max 0.2mm runout.

Use flexible coupler between motor and driveshaft to absorb minor misalignment and vibration.

Check bilge (hull bottom) for water after every test run until seal is confirmed leak-free.

Marine Power

Marine Battery Pack

For a Sea-Doo conversion, LiFePO4 chemistry is strongly recommended over NCM. LiFePO4 does not undergo thermal runaway if the pack is flooded or damaged — critical when the battery lives in a hull that may capsize. NCM can be used but requires more robust encapsulation.

LiFePO4 vs NCM for Marine

Property	LiFePO4	NCM
Thermal runaway	No	Yes — fire risk
Energy density	Lower	Higher
Flood safety	Safe	Dangerous
Cycle life	3000+ cycles	500–1000
Full charge V (20S)	73.0V	84.0V
Recommended	✓ Marine use	Sealed only

Battery Enclosure for Marine

IP68 rated box — tested to 1m submersion for 30 minutes minimum. Use O-ring sealed aluminium case.

Positive buoyancy — battery box should float if hull fills. Foam fill remaining void space.

Bilge pump integration — install automatic bilge pump and water alarm inside hull. Water ingress must be detected before it reaches battery.

Stainless hardware only — all bolts, brackets, and terminals inside hull must be 316 stainless steel. Aluminium oxidises in saltwater.

Marine Wiring

Sea-Doo Wiring Overview

        ━ B+/B− (waterproof glands)
        ━ Phase wires (marine grade)
        ━ Hall/throttle signals
        ━ Shore charge port
        ━ Bilge pump / water alarm
      

🌊

Marine wiring rule: Every single wire penetrating the hull must use a waterproof cable gland rated IP68. Use tinned marine-grade wire — standard automotive wire corrodes in weeks in a marine environment.

Step by Step

Sea-Doo Conversion Procedure

Strip the Engine & Fuel System

Remove engine, supercharger, intercooler, fuel tank, fuel lines, exhaust system, and engine bay wiring harness. Keep jet pump, driveshaft, hull, steering, handlebars, and seating. Photograph and label everything.

Clean & Inspect Hull Interior

Pressure wash hull interior. Inspect for cracks, delamination, or water damage. Check bilge drain. Measure engine bay dimensions carefully for battery box fitment. Note all existing wiring routing paths.

Service Jet Pump & Shaft Seal

Fully service the jet pump — inspect impeller for damage, replace wear ring if needed, replace mechanical shaft seal with new OEM part. This is your last chance to access the seal before the motor is installed. A leaking shaft seal sinks the conversion.

🔴 Never skip shaft seal replacement on a conversion. The old seal is worn for a reason — install new.

Fabricate Motor Mount

Build motor mount from 316 stainless steel or marine-grade aluminium 6061. Must align motor shaft precisely to driveshaft centreline. Use dial indicator — max 0.2mm runout. Bolt to existing engine mount points where possible.

Install Flexible Coupler

Install flexible jaw coupler or rubber spider coupler between motor shaft and driveshaft. This absorbs vibration and minor misalignment. Torque coupler bolts to spec. Check runout again after installation.

Build & Install Battery Pack

Assemble LiFePO4 or sealed NCM pack in IP68 enclosure. Install in hull with stainless mounting hardware on anti-vibration mounts. Battery box must not shift during capsize manoeuvres. Keep below centre of gravity for stability.

Install Waterproof Controller

Mount IP67 controller enclosure above the bilge waterline. Use tinned marine wire for all connections. Route through IP68 cable glands. Apply corrosion inhibitor (Corrosion-X or equivalent) to all terminals.

Route & Connect All Wiring

Use tinned marine-grade wire throughout. Route all cables above bilge waterline where possible. Every hull penetration = IP68 cable gland. Install waterproof fuse holder close to battery. Wire original PWC throttle to controller throttle input.

Install Shore Charge Port

Mount IP68 charge inlet on hull side above waterline. Route charge wires to BMS charge input. Install lockable sealing cap — charge port must be capped before any water contact. Test charge port seal with water before use.

Install Bilge Pump & Water Alarm

Install automatic bilge pump and high-water alarm. Route alarm to handlebar indicator light. A small water ingress alarm gives you warning before hull fills. Check bilge after every session until shaft seal proven leak-free.

Dry Test First

On trailer, run motor briefly at low throttle. Check all connections for heat, check bilge for any water. Check shaft rotation is correct direction (water should thrust backward = PWC moves forward). Confirm brake/cut-off function.

First Water Test (Calm Water)

Launch in calm shallow water. Idle speed first — check bilge for water after 5 minutes. If dry, increase speed gradually. Check BMS app for temperature. After first session, drain bilge and inspect all connections for corrosion or moisture. Do NOT capsize test until fully confident in seal integrity.

Marine Tools

Tools & Equipment

Required Tools

📏

Dial Indicator

Shaft alignment — 0.2mm max runout

REQUIRED

🔧

Marine-Grade Torque Wrench

Stainless fastener torquing

REQUIRED

🌊

Pressure Washer (test)

Waterproof seal testing

REQUIRED

🔌

Multimeter (CAT III)

All electrical checks

REQUIRED

✂️

Marine Wire Crimper

Tinned wire, IP-rated terminals

REQUIRED

🔬

Bilge Water Detector

Test shaft seal integrity

REQUIRED

💻

Controller App

Motor programming

REQUIRED

🛡️

Corrosion-X Spray

All electrical terminals

REQUIRED