BattaMax User Manual
Revision 2.0
Page 10 of 14
windy
nation
01/06/2016
4.1.2
Charge Characteristic Curve (Standby Use)
4.1.3
Temperature Compensation
Many charge controllers offer a Battery Temperature Sensor (BTS) that automatically adjusts the charging
parameters based on the measured battery temperature.
The temperature should be adjusted by subtracting 0.004 volt per cell from the voltage reading for every 1°C
above 25°C, or adding 0.004 volt per cell for every 1°C below 25°C.
4.2 D
ISCHARGING
Batteries should be sized so the rated capacity is double that of the required load. As an example, if the load will
require 50Ah on average, the battery capacity should be 100Ah. This will limit the average depth of discharge to
50% and will extend the life of the battery as shown below
4.2.1
Constant Current Discharge
Amperes at 25
o
C (77
o
F)
5min
10min
15min
30min
45min
1h
2h
3h
5h
10h
20h
F.V/Time
080 100 080 100 080 100 080 100 080 100 080 100 080 100 080 100 080 100 080 100 080 100
1.80V/cell
200.5 224.9 144.3 179.9 117.7 146.7 73.4 91.4 56.4 70.3 46.0 57.3 26.9 33.5 20.2 25.1 13.9 17.3 8.1 10.1 4.3
5.3
1.75V/cell
219.0 273.0 158.5 197.6 127.7 159.1 76.4 95.3 58.6 73.0 47.4 59.1 27.6 34.4 20.7 25.8 14.2 17.7 8.3 10.3 4.4
5.4
1.70V/cell
236.8 295.2 169.3 211.0 137.9 171.8 79.0 98.5 60.5 75.4 48.8 60.8 28.4 35.4 21.1 26.3 14.5 18.0 8.4 10.5 4.4
5.5
1.65V/cell
255.3 318.2 180.6 225.1 145.7 181.6 83.4 103.9 63.0 78.5 50.7 63.2 29.2 36.4 21.7 27.1 14.7 18.4 8.5 10.6 4.5
5.6
