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 our final version (see picture). If you have a Pilot version of our Telraam S2 Outdoor, please refer to this page.

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1. Power supply

Each Telraam S2 Outdoor unit comes with a pre-mounted cable and a junction box for a waterproof connection. The final 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.

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

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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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.

⚠️ 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.

Option 1: 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, 90Ah with USB-C output cable) This solar kit comes with a USB-C cable and provide a steady 5V output, making them plug-and-play with the final 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

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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

Option 2: standard power adapter

You can use a standard USB power adapter, like the one you’d use for a mobile phone. It should supply 5V (standard) with at least 0.5A, most modern adapters easily meet this requirement. Just make sure the power cable and adapter are protected from water. A weatherproof connection box is a good solution, here’s an example.

Option 3: Combined power bank and power adapter

In some cases (e.g. street light), power will only be available for a certain amount of time and you will have to combine a power adapter and a power bank:

We tested some hardware in our office to give suggestions to you. The hardware used:

INIU B63 Power Bank 100W 25,000mAh which has 92.5Wh (should be enough for 3-4 days)
INIU USB C Charger, 65W 3-Port [USB-C + USB-A] (there seems to be a newer 100W version that we did not test)

⚠️ Warning: Not all power bank and adapter combinations work reliably. Some power banks don’t support pass-through charging, others may reset when the adapter is plugged in or unplugged. In some cases, the adapter may even drain the power bank when it’s not receiving power. So please test before deploying.

Option 4: External battery

We found a 12.8V 100Ah battery with a USB 5V port, and a build-in Battery Management System, theoretically we should be able to use it for 6-7 weeks. Currently we are still testing this one... (updated 17/06/2025).

Summary

Power supply for Final version of Telraam S2 outdoor is based on USB-C (5V 0.5A minimal)
Telraam clients in Belgium may request a solar kit (extra cost)
Power source installation is your responsibility – plan accordingly!