Power supply for Telraam S2 Outdoor

To power your Telraam S2 Outdoor correctly and safely, it’s important to know which hardware version you’re working with. This guide explains the power requirements for both device versions and offers examples of suitable power sources.

1. Power supply

Each Telraam S2 Outdoor unit comes with a pre-mounted cable and a junction box for a waterproof connection. The type of power input depends on the device version:

Final version (released in April 2025): USB-C power input (5V)
Pilot version (anno 2024): DC barrel jack input (12–24 V DC)

⚠️ Warning: If you're using an external battery (e.g. car battery or DIY power source), remember that the Telraam S2 Outdoor does not include automatic battery cut-off protection. Always use a safe and regulated power source to avoid draining your battery or damaging the device.

⚠️ Warning: Only connect to correct power sources. Using other voltages may permanently damage the unit.

Final version (released in April 2025)

The newer version of the Telraam S2 Outdoor features a female USB-C connector inside the junction box. This makes powering the unit easier and more flexible.

Power Requirements

Input voltage: 5V
Connector: USB-C
Power consumption: ~1W (0.2A)
Recommended: Use a power source that can supply at least 0.5A for stability
You can use any USB-C power supply that meets the above specs – solar panel, power bank, wall adapter, etc.

How to connect

Open the junction box by unscrewing it at both ends and also at the third seal (marked by the red rubber line).
Feed the male USB-C connector from your power source through the nut and rubber gaskets and the larger plastic section of the junction box.
Plug it into the female USB-C connector.
Close the waterproof junction box by tightening the nuts securely to ensure a watertight seal. It is best to first tighten the seal between the two parts of the body, and then tighten the ends.

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Pilot version (anno 2024)

Power Requirements

Input voltage: 12–24 V DC
Connector: Barrel jack (5.5 x 2.1 mm).
Female barrel jack at the end of the cable from the Telraam S2 Outdoor unit.
Compatible Power Sources: AC/DC adapter (12V or 24V), battery setup with regulated DC output, solar power systems with DC output in the correct range

How to connect

Pass the male barrel jack from your power source through the nut and rubber gaskets on the junction box.
Plug it into the female connector inside the box.
Tighten the nuts securely to ensure a watertight seal.

2. Power sources

The installation and supply of power is the responsibility of the customer. Below are some general suggestions, but Telraam is not responsible for third-party power configurations.

Option 1: Local power source

Power from a nearby source such as existing lighting infrastructure (e.g., streetlights), external batteries, ... Ensure compatibility with the barrel jack connector for first version, or USB-c for the second version.

We don’t currently offer a ready-made solution for 12V or 24V (car) batteries with the second version of Telraam S2 Outdoor. However, it is possible — you’ll just need a little DIY spirit and the right components:

Use a DC-DC converter that steps down from 12V (or 24V) to 5V USB-C (example).
Ideally, combine this with battery protector. These help avoid draining your battery too low and getting stuck somewhere you’d rather not be. (the Victron Energy BatteryProtect 12/24 Volt 65 amp).

This was how we handled power in the Pilot model, so feel free to borrow from that setup if you're feeling confident.

Option 2: Solar battery kit

For Telraam S2 Outdoor installations without access to local power, a solar-powered setup is a great option — as long as it’s sized correctly for your location and sunlight availability. For clients in Belgium, we offer pre-tested solar battery kits as an optional add-on (available at additional cost). For clients outside of Belgium, we recommend calculating the Solar Kit Requirements (see more info below). Depending on the outcome, you could order yourself the same battery-solar kit we provide in Belgium (TecDeft 60W Solar Panel Kits 5V/12V). This solar kit comes with a USB-C cable and provide a steady 5V output, making them plug-and-play with the 2nd version of our Telraam S2 Outdoor.

⚙️ What are the Solar Kit Requirements?

The ideal solar panel and battery size depends on two factors:

Your tolerance for downtime (How okay are you with the device going offline occasionally?)
Your geographical location (Sunlight varies, and so does solar panel efficiency)

To calculate the right balance for your needs, we suggest using this free simulation tool from the European Commission: 🔗 PVGIS Solar Simulation Tool

or scan 032025-Installation-manual-Telraam-S2-Outdoor-(2).png

How to use the tool:

Select your installation location on the map
Enter the Watt-peak value of your solar panel (e.g. 20W, 30W...)
Enter the battery capacity (in Wh)
Enter the power consumption of the device
- Telraam consumes about 1W, so roughly 24Wh per day
Run the simulation
The tool will estimate the percentage of days the device may be offline due to insufficient power

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🛠️ Installation tips:

Install the photovoltaic panel facing between south-east and south-west
Ensure no shading or obstructions (e.g. trees, buildings, birds with opinions)
Follow the manual of the solar kit for proper setup

Summary

Power supply is different for first and second version of Telraam S2 Outdoor
- Version 1: 12–24 V DC power input via a standard 5.5 x 2.1 mm barrel jack, junction box included
- Version 2: 5V power input via USB-C (female connector)
Telraam clients in Belgium may request a solar kit (extra cost)
Power source installation is your responsibility – plan accordingly!