F07 - SET TEMPERATURE COEFFICIENT

DEFAULT = 0.5

RANGE = 0.1–1.5

STEP = 0.1

This factor compensates for capacity change with temperature. Typical value 0.5% Capacity/°C. This coefficient must be supplied by the battery manufacturer. The default value is typical for lead acid liquid or gelled batteries. Normally this value is not changed.

F08 - SET PEUKERT'S EXPONENT

DEFAULT = 1.25*

RANGE = 1.0–1.50

STEP = 0.01

Sets the exponent for Peukert’s equation. A setting of 1.0 defeats Peukert's calculation. Properly setting Peukert's exponent ensures an accurate display of time remaining. See page 26 for a discussion of Peukert's equation and typical values for various batteries. *Default for liquid electrolyte batteries (F10 set to Type 1). When F10 is set to gelled electrolyte batteries (F10 set to Type 2), a default exponent of 1.11 is used.

F09 - LOW BATTERY DISCHARGE FLOOR

 

DEFAULT = 100% RANGE: 50%–100%

STEP: 5%

Your Link 20 allows you to declare the discharge floor used for meter calculations. An independent discharge floor may be selected for each battery bank. The display floor will be applied to the battery bank selected (BAT 1 or BAT2) at time this function is invoked. As supplied by the factory, the discharge floor is 100% of amp-hour capacity, corrected for high discharge rates. With the discharge floor to 100%, the TIME remaining display essentially reports TIME to "dead battery." If you change the discharge floor to 50%, you would essentially see the TIME "till the battery is 50% discharged." This is when charging should begin to conform to our "Mid Capacity Rule."

CAUTIONS: If you discharge below the discharge floor, partially charge, but remain below the discharge floor, the TIME remaining display will continue to read zero. The TIME display will not show meaningful readings until you have recharged above the discharge floor you have set. Also, remember that the light bar and TIME remaining displays are run on rate compensated (Peukert equation corrected) amp hours.

F10 - BATTERY TYPE

DEFAULT = 1 RANGE: 1 = WET (LIQUID) ELECTROLYTE 2 = GELLED ELECTROLYTE

This function declares your choice of liquid or gelled electrolyte batteries. Battery Type is applied to both battery banks. We strongly recommend against designing systems using both liquid and gel cells as their charging requirements are quite different. The default value is Type #1, a liquid electrolyte lead acid battery. To select Type #2, (gelled electrolyte lead acid batteries) set TYPE to 2. Changing the battery type sets an approximately appropriate Peukert rate compensation exponent (1.25 for liquid cells and

1.11for gel cells). When type 1 is selected, a Charged Voltage of 13.2 (or 26.4 V) is selected, while Type 2 sets a default Charged Voltage of 13.5 (or 27 V). You may wish to select a different Charged Voltage. See Temperature Compensation Table on page 17.

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