OVMS does this https://www.openvehicles.com

 

thanks i'll take a look

 

ok ive gone mad and ordered one of those to try out. One thing that spooks me is this 12v battery discharge issue. Has anyone has issues with OVMS and 12v batteries recently?

 

Good - I do hope you'll keep us posted here about how you get on with it.

 

so just an update on this. i received and setup OVMS using a sim + GPS modules. All very nice, im not particularly bothered about the app as the main use case for me was extracting data for home assistant and just being able to see the SOC anywhere in the world, even if Im not with the car. Mission accomplished on that front.

BUT

yes, it drains the 12v battery. I monitored it for 12 hours, starting voltage indicated 12.6 in off + locked + not charging. by 7am (12 hours later) indicated voltage was 11.99v.

Thats a significant and worrying draw on the 12 battery.

So i really have 2 options, send it back or avoid using the 12v battery to power the OVMS. Ive decided to to go with option 2, seeing real time SOC anywhere is a great thing, and will be essential for public charging I think.

Im taking my inspiration from here: Possible Kia e-Niro 12V drain · Issue #275 · openvehicles/Open-Vehicle-Monitoring-System-3

 

so just an update on this. i received and setup OVMS using a sim + GPS modules. All very nice, im not particularly bothered about the app as the main use case for me was extracting data for home assistant and just being able to see the SOC anywhere in the world, even if Im not with the car. Mission accomplished on that front.

BUT

yes, it drains the 12v battery. I monitored it for 12 hours, starting voltage indicated 12.6 in off + locked + not charging. by 7am (12 hours later) indicated voltage was 11.99v.

Thats a significant and worrying draw on the 12 battery.

So i really have 2 options, send it back or avoid using the 12v battery to power the OVMS. Ive decided to to go with option 2, seeing real time SOC anywhere is a great thing, and will be essential for public charging I think.

Im taking my inspiration from here: Possible Kia e-Niro 12V drain · Issue #275 · openvehicles/Open-Vehicle-Monitoring-System-3

will report on how to I get on. powering OVMS from a spare fuse or piggybacking on an existing fuse that only energises when on charge or when driving seems like the best option.

 

I’d also be very interested in this.

 

Me too please

 

hi, i will do my best. Give me a few days.

 

Slightly old post now, but did you ever get round to doing that? I've got an e-niro 2 and i'm quite keen to get OVMS but don't want to find myself with a flat battery.

 

Apparently this set-up/device has minimal draw on 12v battery

EVOBD2 Kit Display with OBDII Bluetooth Compatible Adapter

EVOBD2 Kit is a tiny smart display Plug & Play, simple to use and always available to show hidden information from your car. It includes an OBDII Bluetooth Compatible Adapater. IMPORTANT: Select electric vehicle model family for proper software and USB cable: Hyundai Kona EV, Kia Niro EV, Soul...

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and supported by former Kona owner

 

A bit old, but did anyone get the guide? Also, anyone knows what cable is needed in order to pull power from a spare fuse to avoid draining the 12v battery?

 

sorry yes it was me and I never did get around to writing it. kids, life etc in the way. If I get time I will write the guide here, all found from existing resources. For the cable I ordered a piggyback fuse cable (on amazon) and to split out the 12v from the odb I found this on ebay.com link here - though mine has colour coded wires

the basic principal is that you take the 12 volt feed from a fuse that is off when the car is off, so for example, I used the heated steering wheel fuse space (the niro 2 doesnt have the heated wheel but the slot is still there and is live)

then you splice it into the ODB cable which feeds the 12v to the OVMS. The splitter cable allows you to still use the odb as a diag port for servicing and everything fits behind the fuse door panel so no wiring showing.

This results in the OVMS powering up only when the car is on or charging. And doesnt affect the 12 battery.

I'll take a few photos of mine so you can see how it works.

 

If anyone interested in new Kia Niro EV (MY2023) with OVMS module connected to ODB2. Graph shows 12V aux battery voltage. I have this module connected now for 1 month, no issues with 12V battery drain.