03/03/97
3
LINK 20 INTRODUCTION
Congratulations! You have purchased the world's only Dual Watch
tm
battery monitor. In
order to understand, use, and install it, PLEASE read this manual!! It provides important
information. Please contact us with suggested improvements. For Link 20 installation,
operation, warranty support, and repair questions please contact Heart Interface.
This symbol is used to point out very important sections of this manual or to indicate
items that may need to be changed through Set Up routines. Please take the time to read
these sections.
The following warnings must be considered during the installation of the Link 20.
Failure to read and follow these special notes can lead to damage to the Link 20 or other
electrical equipment.
POWER CONNECTION WARNINGS
1. When installing your Link 20, make all shunt and ground connections BEFORE
applying power to the unit.
2. The wires connecting the battery to the dual shunt, and from the dual shunt to your
system ground, will carry large current. Size the wire appropriately. Large batterry
banks contain enough energy to start a fire if improperly sized wire is used.
3. Disconnect all charging sources during the installation process.
IMPORTANT BATTERY FACTS
1. An Amp-hour (A hr) is 1 Amp of current flowing for one hour, or 2 Amps for
1/2 hour, or 4 Amps for 1/4 hour, etc.
2. Many batteries designed for deep cycling service are rated at their 20 hour rate.
This means a 12 Volt, 100 A hr battery will sustain 5 amps for 20 hours before its
voltage under load drops to 10.5 volts. A 12 Volt lead-acid battery which will not
maintain 10.5 Volts under load is considered "dead" - it's completely discharged.
3. Our Mid-Capacity Rule says discharging more than 50% of a battery's capacity
shortens life. Charging more than 85% takes too long with an engine driven
charging system. So, 35% of the battery capacity is all that is normally available.
If you regularly need 100 Amp-hours of energy, your battery capacity should be
about 300 Amp-hours.
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