— 33 —
Note (2):
The Peukert equation approximates the effect of discharge rate on battery capacity.
The Device takes the Peukert effect into account for the state of charge calculation.
An ideal (theoretical) battery has a value of 1.0. For lead-acid batteries, the value
of the Peukert constant is in the range of 1.10–1.25. If the manufacturer
has not specified the Peukert’s exponent for the battery, you may inquire about it.
If the battery documentation contains values of the battery capacity for at least two
different discharge hour rates, you may calculate the exponent on your own using
the following formula:
where:
k – Peukert’s exponent;
t1 and t2 – the discharge hour rates #1 and #2;
C1 and C2 – battery capacity values for discharge hour rates #1 and #2.
Please note that Peukert’s formula is no more than a rough approximation of reality,
and that at very high currents, battery capacity will be even lower than predicted from
a fixed exponent.
Note (3):
When the Maretron compatibility mode is ON, the Device sends the command message
PGN 126208 «Group Function» (for compatibility with Maretron and Carling Tech
equipment) after every PGN 127502 «Switch Bank Control» sent.
2. Device configuration with Installation Description strings
Installation description strings are stored in the Device’s memory. In practice, installers use them to specify
device location, or leave text notes or contact information. To set an installation description string,
you may use PC software and a hardware gateway to an NMEA 2000 network. Some MFDs also allow
editing of installation description strings. Please refer to your software or chart plotter documentation
for details.
Содержание NMEA 2000 YDBM-01
Страница 66: ......
