Gen2/Motor Controller/Versions

Bike		Controller		Limits
Years	Models	Manufacturer	Model	Input Voltage	Phase Current
2009-2011	S/DS	Alltrax	AXE4855 refs: [1] [2]	48V	500A
2012	XU	Sevcon	Gen4 Size 2	120V	220A
	S/DS		Gen4 Size 4		420A
	X/MX	Alltrax	AXE7245 refs: [3] [4]	72V	450A
2013-2016	XU	Sevcon	Gen4 Size 2	120V	220A
	S/DS/FX/FXS/MMX		Gen4 Size 4		420A
	SR/DSR		Gen4 Size 6		660A
2017+	S/DS/FX/FXS/MMX		Gen4.5 Size 4		550A
	SR/DSR		Gen4.5 Size 6		775A

2017 “Gen4.5”

2017 models reference higher current ratings without publicized evidence of a Sevcon model change.

These improvements seem to be in choosing MOSFETs with increased power switching efficiencies to allow higher continuous and peak current levels.

“Gen4.5” has been a term heard describing these improvements.

Gen4 Size 6 Controller

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  Sevcon Gen4 Size 6 Controller Top

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  Sevcon Gen4 Size 6 Controller Top Terminals

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  Sevcon Gen4 Size 6 Controller Terminals Left Side

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  Sevcon Gen4 Size 6 Controller Connector

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  Sevcon Gen4 Size 6 Controller Left Side

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  Sevcon Gen4 Size 6 Controller Front

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  Sevcon Gen4 Size 6 Controller Rear

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  Sevcon Gen4 Size 6 Controller Bottom

Gen4 Size 6 Controller Internals

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  Sevcon Gen4 Size 6 Controller Connection Front

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  Sevcon Gen4 Size 6 Controller Connections Profile

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  Sevcon Gen4 Size 6 Controller Connectors Left Side

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  Sevcon Gen4 Size 6 Controller Casing

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  Sevcon Gen4 Size 6 Controller Top