Overview of OVMS EV telematics system with road map to integrate with OpenEVSE for smart EV charging https://openvehicles.com

1. Brief Overview
Glyn Hudson 13/12/18

2. Nissan e-NV200

4. ● Connects to ODBII universal CAN bus port
● Based on ESP32
● Fully open-source hardware & software
● Integrated 3G, WiFi, GPS and Bluetooth
● Automatic OTA FW updates
● iOS & Android APP
● MQTT enabled
● Open API

5. Compatible with following EV’s
● Tesla Roadster
● Nissan LEAF 2011-2017
● Renault Twizy
● Kia Soul EV
● GM Volt / Ampera
● Mitsubishi Imei / Citroen C-Zero
● Renault Zoe (dev, basic functionality)
● Tesla Model S (dev, basic functionality)

7. OVMS Web Config

9. Nissan LEAF / eNV200 OVSM Features:
● Remote climate control enable / disable
● State of charge (SOC)
● State of health (SOH)
● Battery voltage
● Battery voltage
● Ambient, Cabin and Battery Temperatures
● GPS location
● Driving speed
● Lock / unlock status
● Headlight status
● Charging speed (voltage / current)
● Aux 12V (lead acid) voltage

10. OVMS Value
A new Nissan LEAF costs (including a battery):
Nissan LEAF Acenta: £24,290
Nissan LEAF Visia: £21,990
Difference of £2,300
Main difference between Acenta and Visia is the inclusion of telematics + cruise
control
OVMS adds more telematics functionality better performance for $150 = £120

11. GSM Connectivity
● Comes bundled
with Holegram.io
SIM IoT SIM card
● $1.5/month
● £0.40/Mb
=
● £1.20/month
● £0.32/Mb

12. GSM Connectivity Cost using Holegram.io
My data usage since July 2018 = 15Mb = approx 3Mb/Month
= £0.32/Mb * 3Mb = £0.96/month data
£1.20 month standing charge
TOTAL: £2.16/month*

13. OVMS VS Nissan API
OVMS
● Open-source
● Non-vehicle specific
● Same API: many different EV’s
● Open API fully-documented API
● Real-time data
● Instant refresh
● MQTT support
Nissan
● Reverse engineered unofficial
API which occasionally changes
without warning
● Data must be requested
manually
● Data request takes a number of
minutes
● May be discontinued in the
future?

14. Open Source ❤️
● Active development
community
● All code open-source
on GitHub
● Accepting of pull-
requests
● Based on standard
platforms e.g. ESP32
Espressive, Android
etc

15. Resources
User Guide: https://docs.google.com/document/d/16JrXR7rybp-
18DrEoeh1rg6GqQT_jVBvhaXh2oEWRHw
Developer Guide:
https://docs.google.com/document/d/1q5M9Lb5jzQhJzPMnkMKwy4Es5YK12ACQ
ejX_NWEixr0
OVMS V3 Firmware: https://github.com/openvehicles/Open-Vehicle-Monitoring-
System-3
Android App: https://github.com/openvehicles/Open-Vehicle-Android

16. Emoncms Integration

17. Home Assistant
Integration

18. OpenEVSE
Integration
Next step, work
in progress...

19. I have a smart meter!
● Secure liberty 100
● SMETS1
● Installed by Magnum engineer
for Ecotricity
● Same meter as used by:
Co-operative Energy Ltd, E, Economy Energy,
Ecotricity, Electricity Plus Supply Ltd, The Utility
Warehouse, EON Energy, Eversmart Energy Ltd,
First Utility Ltd, Robin Hood Energy Limited,
Spark Energy Supply Limited, Toto Energy
Limited and Utilita Energy Limited, Octopus

20. In home display (IHD)