Welcome - OVMS User Manual

OVMS: Renault Twizy User Guide

Welcome!

The OVMS (Open Vehicle Monitoring System) team is a group of enthusiasts who are developing a
means to remotely communicate with our cars, and are having fun while doing it.
The OVMS module is a low-cost hardware device that you install in your car simply by installing a
SIM card, connecting the module to your car's Diagnostic port connector, and positioning a cellular
antenna. Once connected, the OVMS module enables remote control and monitoring of your car.
There are two ways for you to communicate with the OVMS module:
1. Send text messages from a cell phone to the OVMS module's phone number. The module
will respond back via text messaging. If you want, the OVMS module can also send text
messages to you when the car reaches certain states, such as if charging is interrupted.
2. Use a smartphone App. Both the OVMS module and the App communicate with an OVMS
server via UDP/IP or TCP/IP over the Internet. The smartphone Apps provide a richer
experience and more functionality, but they do require a data plan on the SIM car you
purchase and install in the OVMS module.
This Guide will help you setup and configure your OVMS module. Initial configuration of the
OVMS module is done via SMS. Once configured, you can use either SMS and/or the cellphone
Apps to communicate with the OVMS module.
Warning!
OVMS is a hobbyist project, not a commercial product. It was designed by
enthusiasts for enthusiasts. Installation and use of this module requires some
technical knowledge, and if you don't have that we recommend you contact other
users in your area to ask for assistance.
Legal disclaimer: by using the OVMS you agree to do so completely on your own risk. Being a
hobbyist project, the OVMS has neither CE approval nor undergone any official EMC tests.
It has no ECE approval, so depending on your country may not be legal on public roads.
Warning!
The OVMS module currently draws about 2.7 Ah per day from the 12V battery,
which unfortunately has only 12-14 Ah capacity on the Twizy. If you do not charge
or drive for more than 3 days, you must charge the Twizy or unplug the OVMS to
avoid deep discharge of the 12V battery! Failure to do this can result in
unrecoverable failure of the 12V battery. If the car does not power up, that can be
due to low voltage on the 12V battery: try charging! The OVMS will send an alert if
it detects the voltage dropping below 11.5V reminding you to charge in time.
Note: charger version 2 recharges the 12V battery from the main battery, you should
get about 2-3 months parking time without recharge with that charger.
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2019/05/02 RT3.9.1