Voltacon 4KVA Manuale utente
1KVA-5KVA
INVERTER / CHARGER
Version: 1.2
User Manual
AUTONOMOUS SOLAR INVERTER
VOLTACON UK LIMITED | 5 ARGOSY COURT WHITLEY BUSINESS PARK | CV3 4GA | COVENTRY | UNITED KINGDOM
5 Years Manufacturer's Warranty
PARALLEL OPERATION
1
4KVA/5KVA Parallel Installation Guide
1. Introduction
This inverter can be used in parallel with two different operation modes.
1. Parallel operation in single phase with up to 4 units. The supported maximum output power is
16KW/20KVA.
2. Three units work together to support three-phase equipment, one inverter per phase. The supported
maximum output power is 12KW/15KVA.
NOTE: If this unit is bundled with share current cable and parallel cable, this inverter is default supported
parallel operation. You may skip section 3. If not, please purchase parallel kit and install this unit by
following instruction from professional technical personnel in local dealer.
2. Package Contents
In parallel kit, you will find the following items in the package:
Parallel board Parallel communication cable Current sharing cable
3. Parallel board installation
This installation steps are only applied to 4K/5K models.
Step 1: Remove wire cover by unscrewing all screws.
Step 2: Remove communication board by unscrewing two screws as below chart.
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Step 3: Remove two screws as below chart and remove 2-pin and 14-pin cables. Take out the board
under the communication board.
Step 4: Remove two screws as below chart to take out cover of parallel communication.
Step 5: Install new parallel board with 2 screws tightly.
Step 6: Re-connect 2-pin and 14-pin to original position.
Parallel board Communication board
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Step 7: Put communication board back to the unit.
Step 8: Put wire cover back to the unit. Now the inverter is providing parallel operation function.
4. Mounting the Unit
When installing multiple units, please follow below chart.
500mm 500mm 500mm 500mm500mm
500mm
500mm
NOTE: For proper air circulation to dissipate heat, allow a clearance of approx. 50 cm to the side and approx.
50 cm above and below the unit. Be sure to install each unit in the same level.
5. Battery Connection
WARNING! Be sure that all inverters will share the same sets of batteries. Otherwise, the inverters will
transfer to fault mode.
WARNING: Be sure the length of all battery cables is the same. Otherwise, there will be voltage
difference between inverter and battery to cause parallel inverters not working.
Follow below chart to connect batteries. All battery cables are connected from inverters to batteries via
the same BUS bar.
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Recommended battery capacity
Inverter parallel numbers 2 3 4
Battery Capacity 400AH 600AH 800AH
NOTE: Recommended spec of cable from inverter to BUS bar and breaker is
listed as below. The cable used from BUS bar to battery should be X pcs of
cable from inverter to BUS bar and breaker. X indicates the number of
inverters connected in parallel.
Recommended battery cable and terminal size:
Model Typical
Amperage
Battery
capacity Wire Size
Ring Terminal Torque
value
Cable
mm2
Dimensions
D (mm) L (mm)
4KVA 67A 200AH 1*4AWG 22 6.4 33.2 2~ 3 Nm
2*8AWG 14 6.4 29.2
5KVA 84A 200AH 1*4AWG 22 6.4 33.2 2~ 3 Nm
2*8AWG 14 6.4 29.2
Breaker
BUS Bar BUS Bar
Ring terminal:
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6. AC Input Connection
Parallel in single phase
Connect Line wires of AC input from each unit to Line BUS bar. Connect Neutral wires of AC input from each
unit to Neutral BUS bar. Refer to below figure for connection of AC input.
Support three-phase equipment
Connect Line wires of the inverter to each phase of the utility. Connect Neutral wires of AC input from each unit
to Neutral BUS bar. Refer to below figure for connection of AC input.
Breaker
Breaker
Breaker
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WARNING: Only Line wires can be connected breaker. It’s not allowed to add breaker into Neutral wires
between inverter and the BUS bar. All Neutral wires are connected to the BUS bar directly, and you can
add a breaker between the utility and the bus bar in the distributor.
WARNING: Be sure the length of all AC input cables is the same to guarantee reliability of sharing
current in each unit.
WARNING: Recommended spec of cable from inverter to BUS bar and breaker is listed as below. The
cable used from BUS bar to AC power should be X pcs of cable from inverter to BUS bar and breaker. X
indicates the number of inverters connected in parallel.
Suggested cable wire and breaker requirement for AC input connection:
Model Amperage for breaker AWG no. Torque
4KVA 40 A 10 AWG 1.4~1.6Nm
5KVA 50 A 8 AWG 1.4~1.6Nm
7. AC Output (Load) Connection
Parallel in single phase
Connect Line wires of AC output from each unit to Line BUS bar. Connect Neutral wires of AC output from each
unit to Neutral BUS bar. Refer to below figure for connection of AC output.
Support three-phase equipment
Connect Line wires of AC output from each unit to the load. Connect Neutral wires of AC output from each unit
to Neutral BUS bar. Refer to below figure for connection of AC output.
Breaker
BUS Bar BUS Bar BUS Bar
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WARNING: Only Line wires can be connected breaker. It’s not allowed to add breaker into Neutral wires. All
Neutral wires are connected to the BUS bar directly.
WARNING: Be sure the length of all AC output cables is the same to guarantee reliability of sharing current in
each unit.
WARNING: Recommended spec of cable from inverter to BUS bar and breaker is listed as below. The cable
used from BUS bar to AC output should be X pcs of cable from inverter to BUS bar and breaker. X indicates the
number of inverters connected in parallel.
Suggested cable and breaker requirement for AC output connection:
Model Amperage for breaker AWG no. Torque
4KVA 40A 10 AWG 1.4~1.6Nm
5KVA 50A 8 AWG 1.4~1.6Nm
8. PV Connection
Please refer to user manual of single unit for PV Connection.
CAUTION: Each inverter should connect to PV modules separately.
BUS Bar BUS Bar
Breaker
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9. Parallel Cable Connection
Parallel cable includes parallel communication cable and current sharing cable. Please follow below chart to
connect to the inverter.
9-1. Parallel Operation in Single phase
Two inverters in parallel:
Three inverters in parallel:
Four inverters in parallel:
9-2. Support 3-phase equipment
Follow below chart to connect inverters to support 3-phase equipment.
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10. LCD Setting and Display
Setting Program:
Program Description Selectable option
28
AC output mode
*This setting is only
available when the
inverter is in standby
mode (Switch off).
Single:
When the units are used in parallel with
single phase, please select “PAL”in
program 28.
Operation to support three-phase
equipment is required to have three
inverters. This setting for each unit
should be different in L1 phase, L2 phase
and L3 phase separately. Please set up
this setting corresponding to each phase
connection.
Besides, power saving function will be
automatically disabled.
Parallel:
L1 phase:
L2 phase:
L3 phase:
30
PV judge condition
(Only apply for
setting “Solar first”
in program 1:
Output source
priority)
One Inverter
(Default):
When “ONE”is selected, as long as one of
inverters has been connected to PV
modules and PV input is normal, parallel
or 3-phase system will continue working
according to rule of “solar first”setting.
For example, two units are connected in
parallel and set “SOL” in output source
priority. If one of two units has connected
to PV modules and PV input is normal, the
parallel system will provide power to
loads from solar or battery power. If both
of them are not sufficient, the system will
provide power to loads from utility.
All of Inverters:
When “ALL”is selected, parallel or
3-phase system will continue working
according to rule of “solar first”setting
only when all of inverters are connected
to PV modules.
For example, two units are connected in
parallel and set “SOL” in output source
priority. When selecting “ALL”in program
30, it’s necessary to have all inverters
connected to PV modules and PV input is
normal to allow the system to provide
power to loads from solar and battery
power. Otherwise, the system will provide
power to loads from utility.
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