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VI. Installation and Connection of Device
The Device requires no maintenance. The Device’s case is not waterproof; please avoid installing the Device
in a location where it can be flooded or sprayed by water, or get wet in rain. To minimize any possible water
damage, we recommend that you cover the MicroSD card slot with a supplied sealing sticker when the slot
is not used.
1. Connecting to monitored batteries / DC circuits
The Device is designed to work with a standard 75 mV shunt (not supplied) with no limits for rated current
(shunts in the range from 5A to 1200A are widely available). If necessary, you may use a shunt with
a nominal voltage drop of 50 or 100 mV, however, with some trade-offs (see Section V). You have to specify
the shunt's rated current and nominal voltage drop in Device's settings, as well as battery's nominal voltage,
capacity and discharge rate.
When making connections, refer to the diagram below (see Figure 1 on the next page).
Make sure to use a marine grade power cable with proper voltage, current, temperature, and water/oil
resistance ratings.
Proper choice of wire gauge is also important: the voltage drop in cables that connect the positive terminal
of the battery to the shunt, and the ground wire of the Device to the negative terminal of the battery
directly affects the measurement accuracy. Determine the amperage in your circuit noting the lengths
of the cables. Assistance in choosing the optimal wire gauge for the lowest possible voltage drop
may be found on the Web.
Please note that the Device readings will be non-zero when the Device is not connected to the shunt
and the battery or when the Device is connected only to the shunt and not connected to the battery.
To prevent the Device from being damaged, NEVER leave any of the Battery Monitor’s red
or blue wires unconnected. If you have not installed a shunt, and use the Device
for measuring battery voltage, connect both wires to the positive terminal of the battery.
Summary of Contents for NMEA 2000 YDBM-01
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