4-2
Some useful functions to know follow below.
Solar Overload:
Enhanced radiation or “edge of cloud effect” conditions can generate
more current than the controller’s rating. The SunStar will reduce this overload up to 130%
of rated current by regulating the current to safe levels. If the current from the solar array
exceeds 150%, the controller will interrupt charging.
Battery Temperature Compensation:
All charging setpoints are based on 25°C (77°F). If
the battery temperature varies by 5°C, the charging will change by 0.15 volts for a 12 volt
battery. This is a substantial change in the charging of the battery, and a remote temperature
sensor (BTS) is recommended to adjust charging to the actual battery temperature.
Day-Night Detection:
The SunStar will automatically detect day and night conditions. Any
functions that require measuring time or starting at dawn, for example, will be automatic.
Battery Types:
The SunStar’s standard battery charging programs are suitable for a wide
range of lead-acid battery types. These standard programs are reviewed in the following
Section 4.2. A general review of battery types and their charging needs is provided in
Section 8.0.
4.2 Standard Battery Charging Programs
The SunStar provides 8 standard battery charging algorithms (programs) that are selected
with the DIP switches. These standard algorithms are suitable for lead-acid batteries ranging
from sealed (gel, AGM, maintenance free) to flooded to L-16 cells and Ni-cad etc. In
addition, an 8th DIP switch provides for custom setpoints using the two potentiometer (VR2,
VR1)
The table below summarizes the major parameters of the standard charging algorithms.
Note that all the voltages are for 12V systems (24V = 2X, 48V = 4X).
All values are 25ºC (77ºF).
DIP
Switches
(4-5-6)
A
Battery
Type
B
Bulk
Voltage
C
Float
Voltage
D
Equalize
Voltage
E
Equalize
Time
(hours)
F
Equalize
Interval
(days)
off-off-off
1 – Sealed
14.0
13.4
None
-
-
off-off-on
2
–
Sealed 14.1 13.4 14.2 1
28
off-on-off
3 - Sealed
14.3 13.4 14.4 2
28
off-on-on
4 - Flooded
14.4 13.4 15.1 3
28
on-off-off
5 - Flooded
14.6 13.4 15.3 3
28
on-off-on
6 - Flooded
14.8 13.4 15.3 3
28
on-on-off
7 - L-16
15.0 13.4 15.3 3
14
on-on-on
8-NiCad
16.0 14.5 None -
-
8-on
Custom
VR2
VR1
VR2+1V
2
7
Table 4.2 Standard Battery Charging Programs
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