Soliton JR Installed with water cooling in the Ghia with Warp 9 Motor

The Synkromotive controller was having problems so I replaced it with a Soliton JR. The Soliton needs liquid cooling so I bought a transmission cooler and a PC liquid cooling kit. Everything connected together without any problems. I filled the reservoir with antifreeze and distilled water and it works fine!

Here is the final installation. I may need to add a fan to the radiator if it overheats on the highway, this is not really a highway car so probably won't be a problem.

Soliton JR installed on the firewall in place of the Synkromotive

Adapted a PC Liquid Cooling Kit which includes a reservoir and 12 volt pump. This installed nicely next to the controller.

Transmission radiator installed behind the passenger side rear wheel next to the batteries

Problems with Synkromotive DC 750 Controller

Synkromotive DC750

I have been driving the electric Ghia for 2 years without trouble. Recently, after fully charging, the Synkromotive controller would not activate the main contactor.

It showed an over voltage error. I was charged to 200 volts, however, it read 218 volts which was over its factory programmed upper limit. I tried to reset the factory voltage calibration to fix the problem, however, i could not access the administrator settings and the company is no longer in business. So on to plan B - buy a different controller. I settled on the Soliton JR which i picked up used for $900. It lists for $1,899 at EVwest.

Soliton JR

The main thing I do not like about the Soliton is that it needs liquid cooling to perform properly. The Synkromotive was air cooled. Setting up a liquid cooling kit with radiator and pump adds weight and complexity. It is also bigger and heavier than the Synkromotive. On the plus side, there are more of them out there and it is easier to find replacement parts and get them repaired. The Soliton also does not need an external contactor so I can remove the one that was installed for the Synkromotive.

Netgain Cable Pull Hall Effect Throttle

I had a problem hooking up the Netgain cable pull throttle because I forgot the proper wiring instructions. I couldn't figure out green, white, and blue wires.

I eventually stumbled across the info:


The functions of each wire on the wiring harness are the following:


Orange: 0.8V to 4.45V, signal 1

Blue: ground for signal 1

White: 5V supply for signal 1

Green: 1.6V to 4.95V, signal 2

Black: ground for signal 2

Red: 5V supply for signal 2

Drain wire: grounded



Once I hooked it up properly, I was able to calibrate the throttle and ot worked fine.

Karmann Ghia EV Conversion - Battery Balancer/Equalizer instead of BMS, Bad Chevy Volt cell

There is new technology available to balance batteries which is very simple, modular, and powerful. I have experience with BMS systems that can only balance at the top (when fully charged) and can only balance batteries that are almost perfectly in sync. When using some older batteries and newer batteries together in one pack, these type of balancers do not function as intended and in my experience do not fully charge the pack. They try to burn off some current from the high cells but can't keep the voltage from tripping the high limit which shuts off charging for a minute. It then turns back on and the same thing happens. It never charges the stronger cells that sit at a lower voltage. Typical BMS systems can only burn off 0.5 Amps per cell to top balance. This is wasted energy and heats up the batteries. The new battery balancer moves energy from one battery to another continuously and can move up to 10 Amps per cell. This is obviously a more powerful and flexible solution.
Additionally, you no longer need a 12v accessory battery, you can just tap 4 of the lithium cells and they will not discharge to become out of sync, they will be continuously balanced with the rest of the pack.
Here is what the older style BMS cell balancers look like. They have an integrated resistor that can burn off 0.5 Amps from the batteries to try to balance them.

Elite Power Solutions cell balancers on GBS Lithium cells

Here is an image showing the out of balance cells. The BMS was not capable of keeping the cells in balance.

Elite Power BMS display cells

This is what the 8s battery balancers look lime mounted in wood racks and wired together. I have six 8s units for my 48 cell battery pack.

Battery Balancers

These are made by Green New Energy or GNE, made in China. Website: http://www.gne2010.com/
Product link: http://www.gne2010.com/4s-8s-gne-active-battery-balancer-equalizer-bms-for-lithium-batteries
1s (one cell) unit available on ebay:

Multiple 1s units can be connected together for any size battery pack.
Here is my final arrangement, this can handle 48 cells.

Six 8s battery balancers connected to terminal strips

This shows the balance wires connected to the Chevy Volt Cells

Chevy Volt battery with balance connections

 After I hooked up all of the balancer connections, I found a problem One of my batteries had a bad cell.

2 kWh Chevy Volt Battery with bad cell

Here is a video showing how the bad cell was found. It showed no voltage and it was swollen.

Unfortunately I will have to buy some used 2 kWh Chevy Volt battery packs to replace the bad cell since one cell cannot be swapped out, the entire 12 cell module needs to be replaced.
Ebay: used 2 kWh battery packs

CAN communication with Chevy Volt BMS Battery Energy Control Module

As detailed in the previous post, I have a Chevy volt battery in the rear of the 74 Bug in parallel with the OEM BMS hooked up. I am trying to verify that the BMS is working. The BMS has a CAN communication system. The X1 connector on the BECM Pin 3 WH/BK is CAN- and pin 4 L-BU is CAN+.

USB CAN device

I bought an USB CAN communication device from eBay to read the CAN data. It is called: "USB-CAN USB to CAN bus Converter Adapter For professional Notebook PC Laptop" for $21.49. It is labeled USB-CAN A1+. It has the following features:

• A standard CAN interface, CAN-H and CAN-L two-wire interface;
• Jumper selectable access or disconnect the terminals 120 ohm resistance;
• The USB interface supports USB2.0, compatible with USB1.1;
• Supports standard and extended frames;
• Support shielding / filtering;
• Support two-way transmission, CAN send, CAN receiver;
• High-speed CAN transceiver the TJA1050; baud rate between 20Kbps-1Mbps optional;
• USB interface directly powered, no external power supply;

Product link: USB-CAN USB to CAN bus Converter Adapter For professional Notebook PC Laptop

Software for Windows was available for download. It is in Chinese. The software is called "CAN bus debugging tools Ver 4.6". It detected the USB device on the appropriate COM port but I couldn't get it to read any data.

To be continued ...

Update:
I hooked it up and couldn't get it to work. Not sure if it is defective or if it is a software problem or if I hooked it up wrong.

DIY Tin Plating / Electroplating of Copper Bus Bars or Terminals

I was able to tin plate some of the bus bars and connectors for use in my electrical projects. Copper is an excellent conductor, however, copper connections are prone to oxidation and can become high resistance areas in the circuit over time, especially when exposed to the elements. This results in poor performance and possibly failure. Commercial products often use tin plated contacts and connectors to provide corrosion resistance. Tin is a cheap metal that maintains conductivity over time even when exposed to the elements. It covers and protects the copper. Gold plating or silver plating are other options which are more expensive.

Electroplating works by dipping the material to be plated in a solution and running electricity through the solution to move metal to coat the material. To tin plate copper, the positive terminal of the battery is connected to the tin and the negative is connected to the copper. The solution has tin dissolved in it. Sugar is added as a brightener.

Note: Caution must be taken when handling acid and when working with electricity. Wear protective equipment (such as gloves, goggles, respirator, etc. and use care in handling materials. Vapors may be harmful as well so avoid inhaling vapors and only work in an environment with good ventilation.

This is how I did it. Follow at your own risk.

Steps:

Materials: pure tin (ingot or solder), an acid, alligator leads, sugar, a battery, a non-conductive container, and the material to be plated - copper bus bar or connectors.


1. I dissolved some shavings of the tin in muriatic acid (hydrochloric acid). I only used 2 ounces of acid. I let it sit for an hour. It started bubbling immediately. The fumes smelled bad possibly toxic.
2. I added distilled water approx 5 parts to 1 part of the solution from previous step.
3. I Added some sugar to the solution as a brightener. I used about a tablespoon for a 2 cup glass.
4. I Attached the positive terminal of the battery to the tin and placed on one side of a glass container containing the solution. 2 D cell batteries connected is series makes 3 volts.

Positive terminal connected to tin ingot in solution

5. I Placed the copper bus bar into the container (not in contact with the tin). The part that is submerged was to be plated. The copper to be plated has to be perfectly clean - i scrubbed it with a scouring pad and washed with soap and water and avoided handling with my fingers to prevent skin oils.
6. Attached the negative terminal to the copper bus bar using alligator clip leads. Once this was connected, the circuit was complete and electroplating started and noticed bubbles.

7. After a couple of minutes, I removed the copper and rinsed it off. Then removed some scale from the plated area. Then plated the area a second time.

Here is the end result, tin plated bus bars

Links to sources of information:

http://transistor-man.com/electroplating_busbar.html
http://hackaday.com/2012/10/14/diy-tin-plating-for-bus-bars/
http://www.sharrettsplating.com/blog/the-tin-plating-process-a-step-by-step-guide/

Re-using Chevy Volt OEM BMS for EV Conversion

I decided to try to use the Chevy Volt BMS to manage the Chevy Volt battery pack used in the VW (Volkswagen) Beetle Electric Vehicle. Since all of the batteries are in one area, connecting the factory BMS harness was simple.

The entire Volt battery pack reconfigured into two rows fit into the area behind the rear seats of the VW. The original BMS units and wiring harness is easily connected. The batteries are strapped together.

The OEM BMS consists of a head unit (K16 Battery Energy Control Module - BECM) connected to multiple slave units (Battery Interface Control Modules - BICM) using the X2 connector, which are directly monitoring the voltage and temperature of the batteries. The units communicate with each other over a CAN network. There is an inductive current sensor and some contractors also connected to the system. The head unit (BECM) controls the balancing functionality and communicates with the vehicle over a separate high speed CAN network on the X1 connector.

A copy of the Chevy Volt Service Manual (PDF) is needed to understand the wiring connections. Here is a link to a thread about the manual. Other copies could be found with an internet search for "2012 Chevrolet Volt Opel Ampera Service Manual".

This is where the BECM is found. It is where the battery control center is and where it is connected to the automobile systems. This needs to be disassembled to remove the BECM.

BMS harness connection X2 to K16 BECM. 

BECM unit K16. The port on the left is X2 connecting to the BMS wiring harness. The port on the right is X1 is connected to power through red and orange and ground through black as shown.

The head unit (K16 BECM) is supplied with 12 volt vehicle power (X1 connector pin 2 RD) and an ignition-on 12 volt signal (X1 connector pin 15 OG/YE).  Ground is connected to pin 1 BK Ground on the X1. It then turns on the slave units (BICM) by creating a regulated 5 volt signal (X2 connector pin 9 GY/RD). This is the bare minimum to turn on the system. The system should manage and balance the batteries as long as it is on. The problem is that I can't tell if it is working or what the status of the cells is without doing additional work to analyze the CAN communication data.

The X1 connector communicates with the vehicle. The CAN communication can be picked up from the X1 connector. On the X1 connector, Pin 3 WH/BK is CAN- and pin 4 L-BU is CAN+. I am hoping that I can analyze the CAN communications using a OBDII USB interface. There are many threads that use Arduino to access/analyze the data. This thread is very informative: http://www.diyelectriccar.com/forums/showthread.php/attempting-hack-chevy-volt-drivetrain-107946.html .

Updates:
Bought USB CAN converter from eBay but couldn't read data.
USB-CAN USB to CAN bus receiver Converter Adapter For professional Notebook PC

New Project - 1974 VW Beetle previously converted to electric vehicle

NEW PROJECT - 1974 Volkswagen Beetle

I was looking through eBay for electric vehicle conversions and first I came across a 911 cabriolet. I bid but didn't win. Then I found a 1974 VW Beetle in Albuquerque, NM which had been converted. It had high end components with a lithium ion battery pack with BMS, a Elcon charger and a Kostov 10" motor. I bought the car and had it shipped to NJ.

Unfortunately, things were not functioning properly. The batteries were GBS 100 ah lithium iron phosphate. Half of them were half dead. I couldn't get them to charge to the same voltage. The pack sagged really badly when accelerating. I spent $1500 on new batteries and still wasn't happy because the cells wouldn't charge properly. The weaker cells would charge first and stop the charging process before everything was fully charged.

GBS Cells with sense boards in rear compartment

Elite Power Solutions BMS display

Elite Power Solutions BMS

I learned from this experience that it is much easier of all the cells are the same age and have the same characteristics. Too much difference causes the BMS to be unable to balance the cells. It is very difficult to keep adding cells and testing the system until it works properly. Also, these cells are bundled in groups of 4. Every time you change a cell, you have to undo the bundle and recompress them to get them to fit. The cells swell over time and often are not easy to get them back in. We bought a shop press to help squeeze the cells together.

Shop press squeezing GBS cells to fit in pack

After all that, my brother was using the car and forgot to disconnect the batteries and ran them down. The electronics were set up to constantly draw the main battery pack to keep the DC/DC converter on. This basically killed 1/2 of the batteries that were not replaced. This forced my hand. I was really unhappy with the performance of the GBS cells anyway. I decided to buy another Chevy volt battery pack and reconfigure the electronics. The Elite Power BMS is specific to the GBS cells and would have to be discarded. The charger also wouldn't work with the voltage of the Chevy volt pack so it also can't be used. Luckily the Soliton controller is rated for high voltage. Hopefully we can sell the good GBS cells and the Elcon charger to recoup some of the cost.
As far as BMS, I was hoping to re-use the OEM Chevy Volt BMS. The volt batteries would have to be cut down to fit in the area where the GBS cells were. My preferred configuration is to use the chevy volt pack in two halves paralleled together to make a 180 volt nominal 90 ah pack.
We found a 2015 pack from a salvage yard and had it shipped for $1650 total.

2015 Chevy Volt battery pack

Luckily the pack was good. All cells functioning properly and no damage. We went ahead and disassembled it. This is my second chevy volt pack so it took less than an hour.

Chevy volt cells taken out of the pack

We the proceeded to cut them down to rectangular shapes. This involved removing the side portions where the coolant normally circulates. This is dangerous and difficult. It is the only way to fit the cells in the space available. This has been done before, we researched. See project by Kraig Schultz.

Chevy volt cells cut on tablesaw

Once the sides are cut off, there is no way to fasten the cells together since the holes for the threaded rods are also removed. The cells need to be banded together with something. We bought Nifty Products SPSPKIT 252 Piece Polypropylene Portable Strapping Kit, 3000' Length x 1/2" Width Coil, Black from amazon.

We used 1/8"x5/8" copper bus bar to connect the two rows of battery cells together in parallel. I wanted to prevent corrosion of the contacts so I decided to electroplate the ends of the copper with tin. This is a surprisingly easy process. I first experimented with using electrical lead free solder as the metal. It worked but did not have the right finish. I then ordered pure tin ingot and tried again with a 3.6 volt battery and used some sugar as a brightener and no salt to limit current. This came out really nice.

First try electroplating with solder

Video of electroplating. You can see the metal coating the copper and bubbles of gas.

End result after scraping with a wire brush. Not optimal.

Bending and twisting copper bus bars with vice

Finished product before tinning

After electroplating tin plating, look at that shine!

To be continued ...