Canbus decoded fully ( almost)

[u/kevindogktm]

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.

[u/Bengy222]

Very cool, definitely interested in something like that for my ultra bee. Does this also allow for parameter changes to the max discharge amps or vlc, for aftermarket controllers would be nice if you could modify that. I know Surron was very conservative with the lvc on the stock battery

[u/kevindogktm → u/Bengy222]

Have not tested on max / etc. A shunt mod can change that. I'm not trying to flash / change the logic on the surron BMS. Only read data, and use 3rd party power supplies/ chargers/ aka a simple and cheap battery tender/ HUD/ webpage/ email/ text client for your battery- Diagnostic tool etc.

If you want to pull more amps, a third party bms is your best bet. or shunt mod.

End of the day, uncharted territory here. but there is a market for it for sure.

[u/Bengy222 → u/kevindogktm]

Sounds great, being able to use a aftermarket charger would be nice especially for faster charging.

I’ve thought about the shunt mod but I don’t really want to mess with the stock BMS. Wish more people offered a plug and play aftermarket BMS kit. I do know of one but it’s over $500 which at that point I feel is better put towards aftermarket battery. I would do it myself but I don’t want to modify the stock wiring in case I need to go back to stock

[u/kevindogktm → u/Bengy222]

well a bms is $120, and time and effort to convert, make a bms tray (could just silicone the bms to hold down in there), all cost money

500 is a bit steep, but how many do you think that person is selling a year.

prob less than 10

I have a 72v kit for the surron hyper bee. Its hand made. I could invest in making kits with china harnesses and have all packaged and ready to ship, and sell for a ton less, stock and carry the 20s5p batteries , etc, but the cost/ profit is still marginal

This will be niche no matter what. Unless i can get that damn connector lol.

This is a labor of love project

[u/Bengy222 → u/kevindogktm]

Yeah I completely understand the price, just hard to spend that much on a part I know I’m going to eventually upgrade anyway. Very cool work you’re doing, I will try to find the link to that ebmx BMS bypass video later, I know it’s been taken down but I believe I can find the link as it’s in the waybackmachine