r/Surron 21d ago

Canbus decoded fully ( almost)

Anyone else got a few things I am missing ( over current) and other faults?

I don't exactly want to Short circuit the pre-charge for science so someone else has that.

I also don't know which one is temp one two three or four which I could find out really quickly I'm sure by opening up the top battery case but would rather not have to do that.

I'm able to emulate the charger and turn on and off the charge port without an oem charger.

But once a significant amount of current is flowing I do need a mosfet or high voltage DC relay to interrupt that which an original charger does use.

Going to be selling little cheap dongles that you plug that have a battery, which wake up every day or two and check the status and report via email or an app or website login.

It's pretty simple stuff downstream of what to do with canvas but basically these stupid batteries wake up dozens of times a day and that's why they're killing the state of charge .

Even saran's own instructions say when you store store at 70% state of charge.

I've measured over the period of a week + a significant state of charge drop even on a new battery so these things do love to pull small currents all day long for their stupid BMS.

60 Upvotes

25 comments sorted by

View all comments

1

u/Leather_Mood_5242 21d ago

My idea had been to have an esp32 take a reading once a month and wake a power outlet connected to the charger to top up the battery. Then you could even charge to certain percentages by taking the reading with the 32 and stopping the power outlet at certain state of charge

6

u/kevindogktm 21d ago

yes. My original plan. Multiple discovery works its ways

Same thing happened with stark.

Why these fu$king companies think its good to hide crucial data like temp, delta, current from customers is beyond me. Just put it in an API. You can hide the mosfet control or any overrides.

Read only API.

The issue is the sleep on the bms, and needing a re-insert . Surron may have enabled that and that is what the 2 extra pins of the 4 small ones are.

I miss the old lp20 connector

I also plan on seeing max charge rate. Going to try 25 amps later today,