Yet another long weekend spent working on the car. My wife will be very happy when I finish this project.

The new handbrake cable was fitted and adjusted. Wired the motor speed sensor to the controller and fit a cover to the controller bus bar connections.

The heater is controlled by a solid state relay which I operate from an illuminated switch mounted on a blank plate where the ash tray used to be. It produces a decent amount of heat and I think you could use it to heat the vehicle as well as demist, although it uses a lot of power.

I got to use my new MIG welder to make the battery hold down bracket. MIG really makes welding simple.

I had a final read of the NCOP14 regs to see if I missed anything and it turns out I did. I forgot about the requirement to disable the vehicle while its plugged into a power point. I haven't run any cables from the fuel flap for a switch. However the charger does output 12vdc onto 2 of its control terminals while its powered up. I will use this to operate a relay which will isolate the 12v feed to the contactors. The relay will also drive an input into the BMS master to start the charge cycle.

There is also a clause in the regs about having an audible and visual alarm if the brake vacuum is low. I am not sure what other people have done with this, so I might see if I can get away without it for the moment. It's a bit stupid as there is no requirement for this in the original vehicle.

I drove the car down to the AEVA meeting last week and it was well accepted. I found out when I got there that one headlight (connector disconnected) and both tail lights were out (blown fuse). The automatic worked very well and I was able to drive very slowly into the hall under perfect control. The controller has really good low speed control due to its current feedback loop.

I will be ready for the engineers inspection later this week so fingers are crossed. The final thing before registration will be replacing the windscreen as it was cracked when I bought the car.

I got the charger back from repair installed it and charged up the battery. On the weekend I fitted the power socket behind the fuel flap, wired it up, finished tidying up the battery wiring, fitted some plastic sheet into the battery box lid and fitted the lid.

The back seat was then installed and at first it didn't fit. A piece of trim under the seat was fouling the battery box lid mounting bolts. 5 minutes later after the jigsaw had its way with the trim it all fit
with nothing to spare.

The hand brake cable no longer fits so I took it to ATS Cables to get a special cable made. Thanks to Graeme from Suzuki Springwood for the tip. I will pick it up tomorrow and install it tomorrow night.

This will finish the rear section of the car.

What's left?
Wire motor speed sensor
Fit a cover to the controller bus bars
Fit and wire heater switch and test heater
Make and fit a hold down bracket for the aux battery
Fine tune vacuum modulator push rod length
Fit BMS master into dashboard
Fit Asus EEE PC into dash
Fit warning HV stickers to relevent bits

Getting Close

I haven't been updating the blog lately due to work pressures.

I've taken the car for a couple of laps around the block. It had very good acceleration but the gear box wasn't changing gears properly - too high revs and hard changes. It didn't have any vacuum on the vacuum modulator and this caused the problems. When I connected the vacuum up it changed low and soft. The rod from the modulator into the transmission was changed for one 3mm shorter and it changed OK with no vacuum.

Had a setback when I connected the wrong cable to the battery charger. It blew up the charger and the BMS. I fixed the BMS but the charger had to go back to China for repair. It's due back next week.

Most of the 12vdc wiring is complete. I just need to wire up a switch to turn on the heater solid state relay. The DC DC converter was mounted into the dashboard with anderson connectors as connections and flexible orange conduit for the 144VDC input. Tomorrow the dashboard goes back in.

The battery boxes need a final tidy up and a perspex sheet mounted inside the lids to protect the terminals. I hope to get the car ready for final inspection in 3 weeks.

Today we had a group effort with 2 other members of Brisbane AEVA helping out with the build. Thanks very much to Greg and Jim for your assistance.

Today we worked out where to mount the charger. As it is a fully sealed unit we decided to mount it under the rear of the car beside the spare wheel well. There is a large recess there where the muffler was previously and it means that the charger will not take up any of the luggage room in the car. A couple of steel brackets and it's now mounted solidly under the car.

We also fitted a number of units to an aluminium plate in front of the batteries. The controller, main contactor and precharge resistor were mounted on top of the plate and a sealed aluminium case was mounted under the plate for mounting terminal strips for connecting to the controller and contactor.

The BMS slave boards were mounted in 2 sealed ABS cases one on the rear battery box for 25 cells and one on the front box for 20 cells. The slave boards are 16 cellls per board and the wiring to the cells will be done in 1 sq mm double insulated cable with a 1 amp 3AG waterproof fuse in each wire. The 4 slave boards are then connected by 2 buses (master and slave) back to the BMS master system which will be mounted under the dash.

Battery Boxes Completed

The battery boxes and motor mount are complete. It took 3 solid days welding and grinding then 2 days painting. Another few hours putting them into the car and I am ready to start wiring. The rear box just fits under the rear seat with about 5mm clearance and the batteries can be maintained by removing the seat (4 bolts) from above. The front box holds 20 batteries and is mounted across the engine bay. The controller contactor and fuse is mounted in front of the batteries on an aluminium plate.

I've mounted some sealed ABS cases for the contactors, fuses and BMS slave boards and run the battery cabling from the rear battery box to the engine compartment in "flexible" orange underground conduit. That stuff is not very flexible and it was a painful experience.

Replaced the bonnet and closed it to see if the battery box fitted. There is only about 2 mm clearance in one spot so I will be doing a small amount of panel beating under the bonnet to give a bit more clearance.

Next weekend more wiring.

Charger Arrives

I received the charger. It's an Elcon 2KW charger with profile for 45 off Sky Energy cells.

The vacuum pump also arrived along with fuses, contactors, cable etc.

Tomorrow I am getting a steel fabricator in to measure up for battery boxes and motor mount.

I just got confirmation form the certification engineer that I don't need to use a big red switch. The new version of NCOP14 allows for isolation of the battery via 2 contactors operated from the ignition switch.

Parts have also arrived for my battery management system. It is a processor based system using a PIC chip for each cell, mounted externally from the cells, 16 per board. The master does coulomb counting and shows SOC for the pack and remaining distance to travel.

Batteries

The batteries arrived just before Christmas. 45 off Sky Energy 100AH cells. I spent a few hours bolting them into groups of 5 using the mounting plates provided.

Its pretty scary wielding pieces of uninsulated metal around the terminals of these cells as they can put out over 1000 amps each.

I have now finished my open source DC controller and it is all set to be tested at high voltage.

I am waiting on fuses and contactors before wiring up the whole battery pack.

For a BMS I am going to use another open source project from http://www.batteryvehiclesociety.org.uk/forums/viewtopic.php?t=1245