EV Conversion Projects

Project Task-List

I am using Trello to organise tasks for the project – It seemed the best way to keep track of what tasks were ongoing/complete etc.

I will keep the Trello board updated with every bit of progress in between posts on this site.

EV Conversion Projects

Orion BMS2 – Pre-install

In order to best maintain and protect the batteries, I have opted for an Orion BMS2 Battery Management System, made by Ewert Energy Systems. This unit is highly capable with a flexible range of I/O and is very configurable using a Windows software utility.

The Orion is a centralised BMS – so there is one central unit which is wired to all cells in the battery. While not ideal for my battery pack which is partially distributed (1/4 of the pack is under the bonnet, the rest is behind the passenger seats) the Orion unit provides the best avaliable compromise for price & functionality.

Thermal Monitoring

As there is no active thermal management planned for the batteries in the project so far, I have opted to also purchase Ewert’s CAN thermistor expansion module. This enables an additional 80 temperature sensors over the BMS’s stock 8. With 88 sensors, I am able to put a thermistor on almost every cell group. If I add active cooling/heating to the batteries later, then these extra thermistors will continue to be important.


The BMS has two CAN interfaces, which are software configurable for different purposes. One is intended for integration with the majority of other CAN components in the vehicle, and the other is intended for auxiliary purposes (Programming, CHAdeMO charger communications). The BMS is programmed with a USB-CAN adapter, which is removed for normal operation.

There is the option of adding CHAdeMO charging capability later, I would simply need to add safety contactors and the charging socket as the BMS can handle all communications for the protocol. If the BMS supported CCS charging as an option, I would choose this over CHAdeMO as it is the winning standard for new charger installations in the UK – but the communications protocol is more complex and at the time of writing, there does not exist a turnkey DIY solution for CCS.

The BMS will control the main on-board charger also – an ElCon TC 6.6kW unit on the main CAN interface. The BMS also has dedicated charger enable & safety interlock signals that will be used to control contactors on the charger’s input for safety.

Projects Server

New Website!

Following the deployment of my new home-server, I’ve spent this weekend migrating services previously hosted at home to be run centrally from it, and starting this site.

The server (currently in a cardboard box, waiting for its real case) is the guts of an old desktop, running Proxmox VE. I quickly migrated over my old website into its own container – where previously it was hosted on a Synology DS215j NAS.

New server “medina” in its temporary new home…

I’ve been wanting to refresh my old site for a while, as it was scratch-built in HTML/CSS as an attempt to learn – it’s functionality was limited, and updating content on it was a pain. I decided to use WordPress for its successor – as thanks to TurnKey Linux it was set up very quickly in a new LXC container on my server.

I don’t expect many visitors here, but at least now they can see a shiny dynamic site with a CMS instead of the static structure of the old site.

Projects Server

Old Website Archive

The old website has been retired, though it will remain on GitHub in code form. It can be found here.