RBRcervello Deployment Calculator

RBRcervata Deployment Calculator

Parameters you'll likely want to change are shown in bold. Calculated/output values are shown in italics. Constant/measured values unlikely to change are shown in grey.

System

RBRcervello
RBRcervata

Batteries
Internal battery pack
None
120 Alkaline D cell (10s12p)
120 LiSOCl2 D cell (4s30p)
56 Alkaline D cell (8s7p)
56 LiSOCl2 D cells (4s14p)

External battery pack
None
8s7p Alkaline
4s14p LiSOCl2

RBRcervata's Parameters

Instrument

Instrument deployment lifetime is calculated separately in Ruskin. However, in order to calculate the modem duty cycle (a prerequisite for estimating its power consumption), we must know some basic information about the instrument to know how much data it will produce.

Instrument deployment lifetime is calculated separately in Ruskin. However, in order to calculate the download time (a prerequisite for estimating its power consumption), we must know some basic information about the instrument with the most channels/sample rate to know how much data it will produce.

Efficacy of direction-dependent sampling depends on configuration and deployment conditions. See the Logger3 command reference for details.

Second Instrument

Mooring Line Modem

Whether a HEM is included in the system, and its means of attachment to the inductive loop, have a significant impact on overall power consumption. SSM power consumption is not considered, as it draws power from the same source as the instrument, not the data controller.

GPS

Weather Station

The Airmar 200WX measures tilt, air temperature, wind speed and direction.

Telemetry

The default reduction value – 80% – is based on empirical data collected across multiple deployments. It encompasses the effects of not only compression, but also real-world telemetry overhead from the messaging protocol (connection metadata, diagnostic data, message delimiters) and any repeated data transmitted due to telemetry drops/outages. Strictly speaking, the actual compression (quantization + differential encoding) is significantly more effective, but to show only the compression ratio would be a misrepresentation of the true amount of data transferred.

For GSM, use “-5%”: no compression is used, but there is still protocol overhead which increases the payload size.

Single-board Computer

Overall