Warnings and Notices

OVMS-33-7600G FCC Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.

  • Increase the separation between the equipment and receiver.

  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

  • Consult the dealer or an experienced radio/TV technician for help.

Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

OVMS-33-7600G Specific Absorption Rate (SAR) information

This OVMS-33-7600G meets the government’s requirements for exposure to radio waves. The guidelines are based on standards that were developed by independent scientific organizations through periodic and thorough evaluation of scientific studies. The standards include a substantial safety margin designed to assure the safety of all persons regardless of age or health. FCC RF Exposure Information and Statement the SAR limit of USA (FCC) is 1.6 W/kg averaged over one gram of tissue. Device types: OVMS-33-7600G has also been tested against this SAR limit. This device was tested for typical body-worn operations with the back of the phone kept 0mm from the body. To maintain compliance with FCC RF exposure requirements, use accessories that maintain an 0mm separation distance between the user’s body and the back of the phone. The use of belt clips, holsters and similar accessories should not contain metallic components in its assembly. The use of accessories that do not satisfy these requirements may not comply with FCC RF exposure requirements, and should be avoided.

OVMS-33-7600G CE Statement

EU importer information:

InTec F9
Ffordd y Parc, Parc Menai
LL57 4FG
United Kingdom

This product can be used across EU member states.



Open Vehicles Ltd

Hardware Version


Software Version


Frequency Range

  • 2.4G WIFI: 2412MHz ~ 2472MHz(Max power: Rated 15.69dBm)

  • GSM 900: 880MHz ~ 915MHz(Max power: Rated 32.66dBm)

  • DCS 1800: 1710MHz ~ 1785MHz(Max power: Rated 29.75dBm)

  • WCDMA Band I: 1920MHz ~ 1980MHz(Max power: Rated 23.40dBm)

  • WCDMA Band VIII: 880MHz~915MHz(Max power: Rated 23.10dBm)

  • E-UTRA Band 1: 1920MHz ~ 1980MHz(Max power: Rated 22.80dBm)

  • E-UTRA Band 3: 1710MHz~1785MHz(Max power: Rated 22.40dBm)

  • E-UTRA Band 7: 2500MHz ~ 2570MHz(Max power: Rated 22.97dBm)

  • E-UTRA Band 8: 880MHz ~ 915MHz(Max power: Rated 22.40dBm)

  • E-UTRA Band 20: 832MHz ~ 862MHz(Max power: Rated 22.95dBm)

  • E-UTRA Band 28: 703MHz ~ 748MHz(Max power: Rated 22.37dBm)

  • E-UTRA Band 34: 2010MHz ~ 2025MHz(Max power: Rated 22.79dBm)

  • E-UTRA Band 38: 2570MHz ~ 2620MHz(Max power: Rated 22.96dBm)

  • E-UTRA Band 40: 2300MHz ~ 2400MHz(Max power: Rated 23.48dBm)

Receiver category


Members applicability:

  1. Extreme temperature: -20-45 Celcius

  2. The device complies with RF specifications when the device used at 5mm form your body.

  3. RED 2014/53/EU

Declaration of Conformity

Hereby, Open Vehicles Ltd declares that this OVMS-33-7600G product is in compliance with essential requirements and other relevant provisions of Directive 2014/53/EU. A copy of the Declaration of conformity can be found at www.openvehicles.com.

General Warnings

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.
The OVMS module is continuously powered by the car, even when the car is off. While the OVMS module uses extremely low power, it does continuously draw power from the car’s battery, so it will contribute to ‘vampire’ power drains.

Do not allow your car battery to reach 0% SOC, and if it does, plug in and charge the car immediately. Failure to do this can result in unrecoverable failure of the car’s battery.

The module can monitor the main and 12V battery and send alert notifications if the SOC or voltage drops below a healthy level.

Average Power Usage

The power used by the module depends on the component activation and hardware configuration. You can save power by disabling unused components. This can be done automatically by the Power Management module to avoid deep discharging the 12V battery, or you can use scripts to automate switching components off and on.

The power manager can trigger deep sleep mode to save the 12V battery from deep discharging.

Most vehicles keep the 12V battery charged automatically using the main battery, so the power usage isn’t a real issue unless parking the vehicle for a long period.

If you want or need to have minimum power consumption, configure the module for minimum power usage (see below) and consider using an OBD cable with an integrated power switch, so you can easily turn off the module when not needed.

If you have fixed vehicle usage/parking times, you can use the scripting system to schedule regular sleep periods (see command module sleep).

Beginning with firmware release 3.3.004, the 12V monitoring can be configured to enable deep sleep based on a low 12V voltage level. On most vehicles, this can be used to automatically shut down the module when parking and reboot when driving or charging.

Module Version 3.3

For module hardware version 3.3, the base components need approximately these power levels continuously while powered on:


Avg Power

12V Current

Base System

340 mW

28 mA

Wifi Client

20 mW

2 mA

Wifi AP Mode

300 mW

25 mA


100 mW

8 mA


270 mW

23 mA


1030 mW

86 mA

With all features enabled, this adds up to:

  • ~ 25 Wh or 2 Ah / day

  • ~ 173 Wh or 14 Ah / week

  • ~ 754 Wh or 63 Ah / month

Note that depending on the vehicle type, the module may also need to wake up the ECU periodically to retrieve the vehicle status. Check the vehicle specific documentation sections for hints on the power usage for this and options to avoid or reduce this.

GPS consumption includes the active GPS antenna, which accounts for ~ 5 mA / 55 mW. Antenna power cannot be switched by the module.

ESP32 deep sleep mode (e.g. triggered by the power management module) reduces the consumption to ~ 15 mA / 165 mW with the active GPS antenna attached, or ~ 10 mA / 110 mW with the GPS antenna detached. The hardware isn’t capable to go any lower than this.

Module Version 3.2


Avg Power

12V Current

Base System

200 mW

17 mA


330 mW

28 mA


170 mW

13 mA


230 mW

19 mA


930 mW

78 mA

This adds up to:

  • ~ 22 Wh or 2 Ah / day

  • ~ 156 Wh or 13 Ah / week

  • ~ 680 Wh or 57 Ah / month