9
PV Connection
CAUTION:
Before connecting to PV modules, please install
separately
a DC circuit breaker between inverter
and PV modules.
WARNING!
All wiring must be performed by a qualified personnel.
WARNING!
It's very important for system safety and efficient operation to use appropriate cable for PV
module connection. To reduce risk of injury, please use the proper recommended cable size as below.
Model
Typical Amperage
Cable Size
Torque
3KVA W/O MPPT
50A
8 AWG
1.4~1.6 Nm
3KVA With MPPT
40A
8 AWG
1.4~1.6 Nm
5KVA W/O MPPT
50A
8 AWG
1.4~1.6 Nm
5KVA With MPPT
60A
8 AWG
1.4~1.6 Nm
PV Module Selection:
When selecting proper PV modules, please be sure to consider below parameters:
1.
Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
2.
Open circuit Voltage (Voc) of PV modules should be higher than min. battery voltage.
Solar Charger
INVERTER MODEL
3KVA
W/O MPPT
3KVA
With MPPT
5KVA
W/O MPPT
5KVA
With MPPT
Max. PV Array Open Circuit Voltage
75VDC
100VDC
105VDC
145VDC
Recommended PV Array MPPT Voltage Range: Vmp*
30~32VDC 30~80VDC 60~72VDC 60~115VDC
Max. charging current
50A
40A
50A
60A
Note:
* Vmp: panel max power point voltage.
The PV charging efficiency is maximized while PV system voltage is close to Best Vmp.
Maximum PV module numbers in Series:
Vmpp of PV module * X pcs
≒
Best Vmp of Inverter or Vmp
range
PV module numbers in Parallel:
Max. charging current of inverter / Impp
Total PV module numbers = maximum PV module numbers in series * PV module numbers in
parallel
Take 5K W/O MPPT model inverter as an example to select proper PV module. After considering Voc of PV
module not exceed 105Vdc and max. Vmpp of PV module close to 60Vdc or within 56Vdc ~ 72Vdc, we can
choose PV module with below specification.
Maximum Power (Pmax)
260W
Max. PV module numbers in series
2
30.9 x 2
≒
56 ~ 72
Max. Power Voltage Vmpp(V) 30.9V
Max. Power Current Impp(A) 8.42A
PV module numbers in parallel
6
50 A / 8.42
Total PV module numbers
2 x 6 = 12
Open Circuit Voltage Voc(V)
37.7V
Short Circuit Current Isc(A)
8.89A
Maximum PV module numbers in Series: 2
PV module numbers in Parallel: 6
Total PV module numbers: 2 x 6 = 12
Please follow below steps to implement PV module connection:
1.
Remove insulation sleeve 10 mm for positive and negative conductors.
2.
Check correct polarity of connection cable from PV modules and PV input
connectors. Then, connect positive pole (+) of connection cable to positive
pole (+) of PV input connector. Connect negative pole (-) of connection
cable to negative pole (-) of PV input connector.
