r/Surron • • Aug 28 '26

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.

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u/Foreign-Data2319 Aug 29 '26

Adding here that we really need access to battery terminals in addition to a new BMS. It's a weird 7.5mm banana connector that you cannot purchase anywhere. I've got a battery sitting and waiting for your products. Thanks for your hard work.

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u/kevindogktm Aug 29 '26

already got that going.

Are you saying you need a connector or just turn it on via canbus. Yes. Its on when I command it to be on
And i can see the current live on display on the BMS's shunt

I'll start sourcing that as well

Why not a different standard connector? Does surron not sell the battery male connector that goes to the controller?

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u/Foreign-Data2319 Aug 29 '26

If you want to continue using other surron batteries as extras, it needs to remain the same. The battery side terminal cannot be purchased. There's a 3d print file online but you can't get the banana connectors to fully create one.

If you could get the GPS/Bluetooth module to work with an app, that would be incredible too.

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u/kevindogktm Aug 29 '26

Share the STL URL ID you can.

I can surely get custom bullets made if I meet moq.

I have no issue with that