Instruction Manual

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function to read “true” amp hours instead of being compensated by assumed battery self discharge, as
more fully described in section 7. It will also prevent the amp hours from being automatically reset to
0, which can occur if a “capacity” value is entered which is non zero.
P16: Filter time constant.
Sets the filtering time for “filtered” Amps display (AD10-AD12) and filtered “volts” display AD3, AD4.
Choose 0, 0.5, 2 or 8 minutes. This makes these displays respond more or less slowly. “0” represents
no filtering, (which will give displays which match the normal “fast” displays) with 8 minutes being the
highest degree filtering, which results in the most “sluggish” readings. See AD3, AD4 (section 6.B) for
more detailed description of what the filter times mean. Values from those (filtered) displays are also
used for determining “Alarm” battery voltage set points, “relay” set points, and they are used by the
logged data functions when recording battery “volts” and “amps”. If you do not wish to use “filtered”
values for these, you can enter “0” as the time constant
P17-P20: Charge control parameters
For possible future solar charger. These are not presently being used.
P22-P23: Alarm Levels for battery 1
This determines which alarms are activated, and whether they should be visual only, or visual with
audio alarm. See Section 6.E, “List of each alarm option” for more details.
Set all of the following to either 0= no alarm, 1= visual only alarm 2=audible and visual alarm.
P22: Lo: Alarms when Battery 1 voltage low.
Chgd: Alarms when Battery 1 meets charged criteria
Hi: Alarms when Battery 1 high
P23: TimCh: Alarms when Battery 1 time to recharge battery
TimE: Alarms when Battery 1 time to equalize battery
P24-P25: Alarm Levels for battery 2.
Similar to P22-P23, except for battery 2.
P26: Batt 1 low battery alarm criteria.
These determine the two criteria which define a “low battery 1 alarm”. One is the (filtered) battery
voltage (AD3) below which the alarm will occur, and the other is the “Battery1 % full” (AD22) value,
below which will cause an alarm. The alarm will occur when EITHER (or both) conditions are true. If
you only want the “Battery1 % full” criterion to cause the alarm, then set the voltage very low, so that
the low voltage can’t possibly be reached. If you want only the voltage to cause the alarm, set the
“Battery1 % full” to “0”, which will cause “N/A” to appear. See section 6.E List of each alarm option,
for more details.
P27: Batt 1 high battery alarm criteria.
This specifies the voltage above which the “high battery 1” alarm will occur. See section 6.E List of
each alarm option, for more details.
P28: Batt 2 low battery alarm criteria.
Same as P26, except for battery 2.
P29: Batt 2 high battery alarm criteria
Same as P27, except for battery 2.
P30-P31: Relay ON criteria and Relay OFF criteria
The relay control is designed so that you can make the relay ON when the battery charge is low and
OFF when more fully charged. Or it can be OFF when low and ON when high depending on the
values you select. To determine the state of charge, the relay is controlled by both the “Batt1 % Full”
data (AD22) and by the “Batt 1 average voltage” (AD3). (For firmware version 2.0 or greater only,
there is an option to turn OFF (or ON) the relay when the battery #1 is sensed as “fully charged” (as
defined by program P32) Here are the six rules that govern the relay: Using PMComm to program
these (with computer interface) will make setting these easier than using the display unit.