[Zak650]

Thanks, the pack will have 32 groups of A123 pouch cells and top out at 116 charge voltage.

[bjfreeman]

Originally Posted by Zak650

Thanks, the pack will have 32 groups of A123 pouch cells and top out at 116 charge voltage.

I assume you will have a BMS with Canbus ability to get Pack voltage, then a Master Canbus module that will communicate with the BMS and the Generator.
This will allow the Generator to kick in when the pack gets low and and shut down when the pack is at a preset voltage. it will also regulated the Generator output to charge the pack correctly.

[Zak650]

I have a Sevcon Gen4 controller that uses Canbus but I am not planning on running a bms. I'lI bottom balance the cells and have a cell log8 breakout board that mounts 4 celllog8s to monitor all the cells and has relays that can operate signal high or low voltage on indvidual cells. I also have a voltage meter that can output high and low voltage signals, these can be sent to the Sevcon controller.

[bjfreeman]

Originally Posted by Zak650

I have a Sevcon Gen4 controller that uses Canbus but I am not planning on running a bms. I'lI bottom balance the cells and have a cell log8 breakout board that mounts 4 celllog8s to monitor all the cells and has relays that can operate signal high or low voltage on indvidual cells. I also have a voltage meter that can output high and low voltage signals, these can be sent to the Sevcon controller.

maybe my solution is more advanced than you want.
The generator output needs to know the state of your batteries. so either you need a interface in the car to manually control the Generator, or you need an integrated system that you set parameters and let the system work.
I would pick the second way since I doubt you want you attention distracted with alarms, while driving.

I have a bms central distribution board that I use. I can remvofe the Shunts and you can use it in parallel with the celllog8.s. It does the same thing your celllog8, except it uses can bus and does not have a display.

you will still need the CanBus (odbII) monitor to set your parameters, independent of the sevcon.The monitor can display and control all the Canbus activity. I also believe there is and EV Display on the forum that can be used for this.

[Zak650]

I've seen a few posts that talk about using an arduino to control a generator it seems an interesting route.

On a seperate path theoretically if you interupted the voltage sensing point in the circuit that leads to the AVR and added voltage to what is sent to the AVR would the net result be a lower voltage output from the generator?

[bjfreeman]

Originally Posted by Zak650

I've seen a few posts that talk about using an arduino to control a generator it seems an interesting route.

On a seperate path theoretically if you interupted the voltage sensing point in the circuit that leads to the AVR and added voltage to what is sent to the AVR would the net result be a lower voltage output from the generator?

theoretically if you put a resistor in the FW path it should lower the output voltage.
the problem is the AVR will try to compensate. it will say oh the sensing voltage on EXW or MW1-R is low so provide more to the FW path.
this might also cause a over current shut down.