User Manual
SeaStar Graphic Supporting Software
©2014 Star-Oddi. All Rights Reserved
Page 71
11.2
Battery Calculations
The voltage characteristics of the batteries used in our recorders make it almost
impossible to measure the energy available in the batteries, therefore we estimate the
energy consumption by calculation. All the energy consuming functions of the
recorder, like sleep, decay, running (microprocessor awake), measurements and
saving data are measured beforehand and used in our calculations. The calculations
recorders themselves do not perform any energy calculations, but in order to start the
recorder in one computer and retrieve data in another while still having the battery
energy information, they carry the percentage of remaining energy with them in a
register file (in the RID). At the time the recorder is in production (when the battery is
new) the energy number is set to 100%.
Each time the recorder is started up in a new measurement sequence, the energy
consumption, since last sequence-start, is calculated and subtracted from the energy
number retrieved from the recorder, and this new energy-left number is downloaded
into the recorder.
The energy-left register in the recorder can be corrupted for reasons such as:
The CRC check is turned off when connecting to the recorder and a
communication error occurs
When a write error occurs when starting up a new sequence or updating a
status to the recorder and a reconnection is performed instead of performing
the operation again.
Energy estimation calculations are not in accordance with actual energy
consumption.
To change/correct the battery energy numbers in the recorder refer to chapter 13.5.
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