Windy Nation TrakMax 40 MPPT Solar Charge Controller - Manual (Page 11)

TrakMax 40 User Manual
Revision 1.0
3.8 C OMMUNICATION P ORT
Network connections allow the TrakMax to communicate with other controllers or computers.
3.8.1 Remote: RJ11
Use standard 4-wire or 6-wire RJ-11 telephone cables (straight-through, not a Null Modem / cross-over). If
possible, pull the telephone cable through conduit before crimping on the RJ-11 connectors. If using pre-
assembled cables, take care not to damage the plugs when the cables are pulled through conduit.
WARNING: Shock Hazard
Never route network cables in the same conduit as the power conductors.
3.9 B ATTERY T EMPERATURE S ENSOR (BTS)
The charge voltage required by batteries changes with battery temperature. Temperature compensation of
the charge voltage enhances battery performance and life, and decreases battery maintenance. Automatic
temperature compensation can be provided through use of the optional battery temperature sensor
(included). Table 3.9 describes approximately how much the voltage may vary depending on the temperature
of the batteries.
3.9.1 Temperature Compensation
Temperature 12 Volt Units 24 Volt Units
Celsius Fahrenheit
Lead Acid
(6 cells)
NiCad
(10 cells)
Lead Acid
(12 cells)
NiCad
(20 cells)
60 140 -1.05 -0.7 -2.1 -1.4
55 131 -0.9 -0.6 -1.8 -1.2
50 122 -0.75 -0.5 -1.5 -1
45 113 -0.6 -0.4 -1.2 -0.8
40 104 -0.45 -0.3 -0.9 -0.6
35 95 -0.3 -0.2 -0.6 -0.4
30 86 -0.15 -0.1 -0.3 -0.2
25 77 0 0 0 0
20 68 0.15 0.1 0.3 0.2
15 59 0.3 0.2 0.6 0.4
10 50 0.45 0.3 0.9 0.6
5 41 0.6 0.4 1.2 0.8
0 32 0.75 0.5 1.5 1
-5 23 0.9 0.6 1.8 1.2
-10 14 1.05 0.7 2.1 1.4
-15 5 1.2 0.8 2.4 1.6
-20 -4 1.35 0.9 2.7 1.8
-25 -13 1.5 1 3 2
-30 -22 1.65 1.1 3.3 2.2
-35 -31 1.8 1.2 3.6 2.4
-40 -40 1.95 1.3 3.9 2.6
Table 3.9: Variances in charging voltage based on battery temperature
Temperature compensation is based on battery type-5mv /cell for lead acid type batteries and 2mv/cell for
alkaline type batteries (NiCad or NiFe). The temperature compensation calculations are derived from the
following table:
Page 11 of 20 windy nation 03/06/2013