> For the complete documentation index, see [llms.txt](https://manual.fotokite.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual.fotokite.com/system-profile/rooftop-box-rtb.md).

# Rooftop Box (RTB)

The Rooftop Box (RTB) is a configuration of the Sigma system that can be mounted on the roof of a vehicle. This allows for deployment of the Sigma system as soon as a vehicle is parked and without the need for an external power source.

{% hint style="warning" %}
The Rooftop Box is designed for static deployment. Do not attempt to drive the vehicle while the system is flying.
{% endhint %}

<figure><img src="/files/ApwxzHClarKPsDkpdK75" alt=""><figcaption><p>Rooftop Box</p></figcaption></figure>

## Rooftop Box Operation

Before launching the system:

* Ensure the vehicle is parked on level ground with the parking brake engaged
* Look above the vehicle for any trees, power lines, or other obstructions
* Keep the engine idling (depending on vehicle power configuration)

The lid of the box will automatically open prior to the Fotokite launching, and automatically close after the Fotokite lands. After closing the lid, all system LEDs go out.

## Installation

This configuration is intended to be semi-permanently integrated to the vehicle by a professional upfitter.&#x20;

### Safety Land Button

The installation will optionally include an external Safety Land Button which will be installed on a panel in the vehicle near the tablet dock. Pressing the button will trigger a Safety Landing and close the lid. The button will be illuminated solid red while the kite is flying and will flash during a safety landing.&#x20;

<figure><img src="/files/qdZAuAoNcT1wCJcg8Ngx" alt=""><figcaption><p>Safety Land Button LED states</p></figcaption></figure>

### Park Break Interface

The rooftop box provides an electronic interface that can be connected to the vehicle’s parking brake. Takeoff is only possible when the parking brake is engaged. If the brake is released during an active flight, a safety landing will be initiated.&#x20;

## Rooftop Box Electrical

In a vehicle setup, the engine and alternator must remain continuously running to ensure proper operation of the Rooftop Box System. When connecting the unit to the vehicle's DC power supply, the input power cables must be protected by a 60A external fuse or a fused disconnect switch. This prevents damage to the cable or the system in the event of a thermal or electrical overload, or due to external weather phenomena such as heavy wind gusts or propeller icing.

When using a power supply, it must be capable of providing at least 50 A and should be set to a minimum output voltage of 13.1 V continuously.

| Power Specification                   | Value    |
| ------------------------------------- | -------- |
| Nominal Input Voltage (DC) \*         | 12V      |
| Operational Input Current: Peak       | 55A      |
| Operational Input Current: Continuous | 50A      |
| Idle Power Consumption (not flying)   | 40-80W   |
| Maximum Power Consumption (in flight) | 300-700W |
| Sleep Mode Power Consumption \*\*     | 0.25W    |

\*The nominal input voltage is 12 V. In practice, automotive batteries typically provide 12.6 V when idle and up to 13.6 V while the engine—and thus the alternator—is running.

\*\*The Rooftop Box System enters Sleep Mode after 5 minutes running without the alternator (car battery voltage reading <12.4V) and exits Sleep Mode once the alternator is running.

### Digital Inputs and Outputs

The RTB provides digital inputs and outputs to connect LEDs and switches.\
Some are required during a vehicle installation, some are optional.\
The outputs are dry contact style, normally open, and capable of switching a maximum of 350mA.\
The inputs are isolated and operate with 12V nominal voltage (28V tolerant, 1kΩ input impedance).

<table><thead><tr><th width="192.150390625"></th><th width="83.82421875"></th><th width="370.74609375"></th><th width="100"></th></tr></thead><tbody><tr><td>RTB open status output</td><td>Pins<br>A1-B1</td><td>CLOSED if the RTB is open,<br>OPEN in all other cases</td><td>optional</td></tr><tr><td>RTB status<br>output</td><td>Pins<br>A2-B2</td><td>TOGGELING (flashing at 4Hz) when emergency landing,<br>CLOSED when RTB is open,<br>OPEN all other cases</td><td>optional</td></tr><tr><td>Safety Land Button input</td><td>Pins<br>A4-B4</td><td>TOGGLED system will emergency land,<br>OPEN no action</td><td>optional</td></tr><tr><td>Park Break Switch input</td><td>Pins<br>A3-B3</td><td>CLOSED system may take off, <br>OPEN system will not take off and show error</td><td>required</td></tr></tbody></table>


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