Greetings,
I am in the process of converting an '05 E2 to a 72v LiFePo2 battery module and dumb charger. The replacement charger was installed in same location as the prior unit and connected (plus and minus wires) to the same terminations for the Delta-Q charger. In researching a reprogram of the Delta-Q charger, I was informed it cannot by modified for a LiFePo2 battery. As such, I ordered a complementary 72V sealed charger. As you might imagine, that charger does not have connections for the ignition interlock, nor temp monitoring. I would like to install a SPST switch to engage/disconnect the interlock as needed for charging/operation. It is my understanding I need to bridge a B+ (72v) feed to the interlock input wire via the switch. Can someone validate or correct my understanding? If there is other or additional circuitry that must be employed, I’d be most grateful for a description and or schematic of what is needed.
Your plan is correct.
For your 05 car, you need to attach the green interlock wire to B+ for the car to run, and remove B+ when charging the battery.
Another quirk of the 05 cars(being the first run of the Gen2 design) is that the handbrake safety loop was not fully developed. Be aware that your car will drive with the handbrake on.
I got thing hooked up today. No bueno! My battery read 0.19v on my multimeter. What? I had to check it to make sure it was working correctly. When I switched on the charger, the voltage at the battery read 87.5v on the multimeter. This seemed right, so I thought perhaps the battery was drained. I let it charge for a few hours then checked the voltage again. 0.19v again. Huh? Obviously the battery wasn’t taking a charge. I then disconnected the battery from the harness and checked the voltage. This time it registered 42.5v.
The only thing I can think of is I have a polarity problem. I reconnected the new battery charger leads to the same points as that used for the Delta-Q. I had to guess on the battery connections as it had no batteries when I obtained it. That said, the cables had red and black boots along the labeling of “B+” and “B-” in the individual wires.
Any suggestions?
Lastly, does anyone have a line on a wiring diagram for an '05 GEM E2?
What battery is this? I’d think you should have way more than that.
Does this battery have a BMS? It sounds like the battery shut itself down.
Ah, the plot expands a bit.
I am guessing that this car came to you untested/not running?
Correct.
Kim Hayes
20055 N 11875 E
Mount Pleasant, UT 84647
801-599-5519
The battery is a 72 volt unit I had custom made in China. It does have a BMS.
Kim Hayes
20055 N 11875 E
Mount Pleasant, UT 84647
801-599-5519
Do you have BT access to the battery?
What does it show?
Start with what you know,
Start with your power source.
I’m sorry, I don’t know what you mean by BT. Can you elaborate some?
Thank you for your patience,
Kim Hayes
20055 N 11875 E
Mount Pleasant, UT 84647
801-599-5519
A popular method to gain access to the battery BMS uses a Phone app via BlueTooth communication.
It allows you to view the status and other settings.
Thank you for clarifying. Let me check into that and get back to you.
Kim Hayes
20055 N 11875 E
Mount Pleasant, UT 84647
801-599-5519
Greetings,
I was able to download the BMS/BT software today and connected to the battery. I have a couple of screen shots to share.
Ok, Your battery shows it is turned ON, but according to the SOC, it thinks it is in a very low state of charge.
Total volts 78.44v is low, but the Diff Volt shows 0.56v which sounds like one or more cells may be way out of balance. Do you have a page that shows you the Volts on each cell directly?
When you tested for volts, did you test the posts on the battery directly?
You might also remove where you attached the charger wires and hook them up to the battery directly to see if you can get some charge into it.
You can watch the progress with this app.
I have no page showing the charge for individual cells. I did test the posts on the battery directly and got a reading of 78.2 volts. The display on the battery reads 79.6 volts. The thing that is puzzling though is when I connect the battery cables, I get a reading at the terminals of 0.19 volts. Could it be the battery cables are reversed?
I was able to find a maintenance manual this afternoon so I now have a basis for troubleshooting.
Thanks,
I think what is happening is that when you connect the car and try to turn it on, the battery is so flat that the BMS shuts down the output.
If you want to test this, connect the car and look at the app again. Check to see if the DisMos is ON/OFF.
Does the RealTime page scroll Up/Down and show you more?
What do you see under the Control Tab?
What do you see under the Parameters Tab?
I will reconnect the battery and check the DisMos reading.
Does the RealTime page scroll Up/Down and show you more? Yes, shown
What do you see under the Control Tab? No access. I get a “No Operation Permission” message
What do you see under the Parameters Tab? When I select “Close capacity correction”, I receive a “Set successfully” message.
When I select “Basic Information” I see the following displayed.
Is the original DQ Charger still in the car?
If not in car, is it still around/available?
I still have the DQ charger, yes. It is not in the car.
Next question: By chance, are the dash panels (upper/lower) removed from the car?
The upper has been removed. The lower is still in place.