Trace Engineering LEGEND II Manual page 71

When the RC7 is connected to the inverter, the inverter's status LED still operates normally.
Installation and operating instructions are included with the RC7.
An optional plug-in external battery-temperature sensor (BTS) automatically fine-tunes the charging
by an additional 20 feet using standard phone cables with RJ-11 plugs. However, locating your
batteries 35 feet from the inverter exceeds the recommended distance and requires heavier battery
cables.
Trace Engineering UL listed battery cables are available from Trace Engineering authorized dealers
in various lengths to ensure maximum power transfer between the inverter and batteries. They are
available in two sizes: 2/0 and 4/0. Cable lengths include 1½, 3, 5, and 10 feet for both sizes. A 4/0
cable length of 15 feet is also available. All Trace Engineering cables have red or black color-coding,
and sealed, crimped ring terminal ends.
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process of the charger. When the temperature sensor is installed,
the inverter/charger adjusts the BULK and FLOAT charge voltage .
A BTS is shown below.
If the temperature sensor is NOT installed, charger configuration
must be manually set.
Install the BTS on the side of the battery below the electrolyte level.
It is best if the sensor is placed between batteries and if the
batteries are placed in an insulated box to reduce the influence of
the ambient temperature outside the battery enclosure. Ventilate
the battery box at the highest point to prevent hydrogen
accumulation.
The BTS provided may be extended beyond the standard 15 feet