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11
12
2.8 Parallel function
SNA series inverter support up to 10 units to composed single phase parallel system or three phase
parallel system, for parallel system setup
Step1. Cable connection: the system connection is as below:
EPS Bus-Bar(L,N)
PV
AC Input
AC Output
CAN 1
CAN 2
BAT
DC
DC
DC
AC
AC
AC
AC
L
N
PE
L
N
PE
L
N
PE
L
N
PE
L
N
PE
L
N
PE
AC
AC
PV
CAN 1
CAN 2
BAT
PV
CAN 1
CAN 2
BAT
AC Input
AC Output
Parallel line 1
Parallel line 2
Parallel line 3
Grid Bus-Bar(L,N)
Grid Bus-Bar(L,N)
EPS Bus-Bar(L,N)
PE
PE
Grid
EPS LOAD
Inverter 1
AC Input
AC Output
Inverter 2
AC Input
AC Output
Inverter 3
2.7 Dry Contact Signal control
The Dry port(NO2,COM2,NC2) could be used to deliver signal to external device when battery voltage
reaches warning level. The GEN port(NO1,COM1,NC1) could be used to wake-up the Generator and
then the generator can charge the battery.
Unit Status
Condition
Dry port GEN
Power Off
Inverter is off and no output is powered.
Close
Open
Power On
Without Grid
Battery voltage < Low DC
warning voltage
Battery voltage > Setting value or
battery charging reaches floating stage
Battery voltage < Low DC
warning voltage
Battery voltage > Setting value or
battery charging reaches floating stage
NO2 & COM2 NC2 & COM2
Close
Open
Close
Open
Close
Open
Close
Open
NO2 COM2 NC2 NO1 COM1 NC1
Dry port GEN
NO1 & COM1 NC1 & COM1
NO2 COM2 NC2 NO1 COM1 NC1
Close
Open
Close
Open
Close
Open
Close
Open
Close
Open
With Grid
Notice: NO---Normal open NC---Normal close
All lux units can work with generator.
Battery will get charged when the generator is turned on, and the generator is bypassed to AC output to
take all loads .
Users can connect the generator output to off grid inverters. GEN input terminal.
The generator will be automatically started when battery voltage is lower than the cut-off value or there is charge
request from BMS. When voltage is higher than AC charge setting value, it will stop the generator
The system will use AC first if there is both utility input and generator input.
MPP T485
Li- ion
CAN /RS48 5
WIF I
NTC
OFF
ON
EPS O utput
Par allel
BAT+ BAT- PVA PVB AC OU TPUTAC IN PUT GEN
Dry P ort
GEN
No2
COM2
Nc2 N o1
COM1
Nc1
OFF
ON
Pow er
PV
BATTERY
HOUSE Essential LOAD
L
N
PE
Generator
L
N
L
N
PE
L
N
Grid
L
N
Double interlock switch or
Dual Power Switch In≥63A
In≥63A
In≥63A
In≥140A
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