I want a cheap EV Conversion

You will need the following components:

components

- cheap motor & inverter, ideally combined units (Toyota Prius Gen2 Inverter, )

- cheap batteries, this will be your biggest expense (Nissan Leaf BMS, BMW i3, repurposed hybrid batteries?)

- DC/DC converter (Mitsubishi Outlander DCDC OBC

- charger ( integrated into existing units, such as Nissan Leaf PDM, Mitsubishi Outlander charger & DCDC, Prius Inverter & charger )

legalities

If you are on a budget, make sure your locality allows what you are trying to do:

UK UK2 United Kingdom

The Netherlands

If you are looking for a performant ev conversion check the sister page.