Use and Care Manual

4. Specifications
Model
GS-MPPT-320W
INPUT
MPPT Range @ Operating
Voltage
15 V ~ 37 V @ 12 V
Maximum Solar Module Open
Circuit Voltage
50 V
Maximum Solar Module Power
300 W
Maximum Current
18 A
OUTPUT
Nominal Battery Voltage
12V
Connected Battery Type
Sealed lead acid, vented, Gel, NiCd battery
Maximum Charging Current
25 A
Standby Power Consumption
2 W
Charging Method
Three stages: bulk, absorption, and floating
PHYSICAL
Dimension (DxWxH mm)
135 x 170 x 57.5
Net Weight (kgs)
0.92
ENVIRONMENT
Humidity
0-100 % RH (non-condensing)
Operating Temperature
-20°C - 55°C
Storage Temperature
-40°C - 75°C
5. Trouble Shooting
Problem
Possible Cause
Solutions
Yellow LED on
Polarity reversal on solar
module connection.
Reconnect polarity again
Red LED on.
Polarity reversal on
battery connection.
Reconnect polarity again.
Orange LED on.
Polarity reversal on solar
module and battery
connection.
Reconnect polarity of
solar module and battery
again.
No solar energy input
during daytime.
Wires are not firmly
connected.
Check if all wires are
connected properly.
Solar module defect.
Check solar modules or
call local dealer to
replace solar modules.
F0 fault code displays on
LCD panel
Battery wires are not
connected well.
Check if battery wires
are properly connected.
Battery defect.
Replace battery.
Backup time is shorter.
Battery defect.
Check battery life cycle
and replace battery.
Overload.
Remove excess loads.
Problem
Possible Cause
Solutions
F1 fault code displays on
LCD panel.
Battery wires are not
connected well.
Check if battery wires
are properly connected.
Battery defect.
Replace battery.
Charge controller defect.
Replace the unit.
F2 fault code displays on
LCD panel.
Overload.
Remove excess loads.
E1 fault code displays on
LCD panel.
Solar input voltage is too
high.
Check if solar wiring is
correct. And then check
solar input voltage.
If any abnormal situations occur which are not listed above, please call Grape Solar
Technical Support at 1-877-264-1014 or email [e-mail].
APPENDIX
Table 1: Recommended minimum battery cable size versus length
Model
Nominal battery
Voltage
Charging
Current
1 meter
(one-way)
Dia-mm
GS-MPPT-320W
12 V
25 A
AWG 12
2.0525
Table 2 External Battery Cable Size Reference
AWG
(American Wire Gauge Size)
Dia-mm
(Diameter in millimeters)
Ohms/Kft (Ohms per 1,000ft
or 304.8 meter)
0000(4/0)
11.684
0.049
000(3/0)
10.405
0.0618
00(2/0)
9.2657
0.0779
0(1/0)
8.2513
0.0983
1
7.348
0.1239
2
6.5436
0.1563
3
5.8272
0.197
4
5.1893
0.2485
5
4.6212
0.3133
6
4.1153
0.3951
7
3.6648
0.4982
8
3.2636
0.6282
9
2.9063
0.7921
10
2.5881
0.9989
11
2.3048
1.2596
12
2.0525
1.5883
9
10