Paul & Sabrina's cheap DIY 144v motor controller

[dave koller]

Just as an unwelcome distraction we have 20 inches of snow (over the last several days) and still coming down.....

[MPaulHolmes]

It was 81 here today. Haha. I wish it was snowing.

[duncan]

Hi Paul
1000 amps is great - I may have to limit my throttle a bit - see what it drives like but I think about 700 amps will light up the tires

[duncan]

Hi Paul
Found I had a dead cell - had to rebalance one string

Anyway the controller is in place - its a monster!
Just thought I would double check about the motor wire(s)
The old controller was motor negative
This one is motor positive???
Just thought I should double check before completing the wiring

Thanks

[MPaulHolmes]

Yes, so you connect B+ on the controller to battery pack +. And the 3 M+ cables to motor plus. And B- on the controller to battery pack minus AND to motor minus.

[camusmuse]

Maybe this is a bit off topic, and admittedly I am new here(first post...). But after a bunch of lurking and reading; I was thinking...this project is simply amazing(duh), and maybe it has been brought up before, but I have a couple ideas.

First, I am sure someone out there could write an Android app for this...it could be very handy if part two is possible; integration with the vehicles OBDII computer. It could be possible to use one of the wireless OBDII "interfaces" already on the market (elm327) to then get access to the controller from the Android Device. I am assuming(and possibly showing my ignorance) that the vehicle's stock ECM is kept in place...especially for cars with PATS or something similar that requires the ecm to run in addition to all the 12v electronics in modern cars.

Just a few random thoughts I had...back to page...whatever it was... I think reading the whole thread will be a great primer for my own knowledge and skill level.

Thanks again....

[duncan]

Hi Paul

Controller installed - its a wopper!

It goes - but only just
It failed to drive up the slope from my shed
I was getting about 20 battery amps at full throttle
I would guess less than 200 motor amps

No bangs smoke or loud noises

I suppose I had better take it back out to connect it to the computer

[duncan]

Controller back out - on my desk with the PiCkit attached and a serial - USB on that connector

[MPaulHolmes]

What sort of throttle do you have? Is it 0ohm to 5kohm at max throttle? I'm sure it's just a software setting that's the problem. Sorry about that. I'll check the max battery amp setting, but it probably is something to do with the throttle settings. I think there are 3 different throttles for the controllers, but just one C file that I change when one of them needs an update.

[duncan]

Hi Paul
Had a brain storm - I thought - maybe I connected the battery +ve to the motor instead of the -ve!
Put the controller back in the car - exactly the same symptoms
So that's not the problem

Throttle
I am using a 0 -5Kohm pot - the same one as on the 500 amp controller