Hybrid Inverter Super-Backup Function introduction

Introduction

This article will introduce the Super-Backup Function on Solax Hybrid G4 inverters. With the Super-Backup function, during black-out the inverter can supply the backup loads even if there are no batteries installed.  

Different from the normal backup solution with batteries, the Super-Backup solution, during EPS Mode, hybrid inverters export power only from PV panels (without batteries). As the PV input power is not stable, there will be some limitation. In order to avoid the overload①, the EPS ports (back-up loads) must be followed:

1. For single-phase inverters, the output power of EPS ports is restricted to half (50%) of the nominal output power of EPS ports (with battery). For more details in the Table1 below.

Table1. EPS output of X1-Hybrid G4 (without battery)

EPS output (without battery)	X1-Hybrid-3.0	X1-Hybrid-3.7	X1-Hybrid-4.6	X1-Hybrid-5.0	X1-Hybrid-6.0	X1-Hybrid-7.5
Nominal output power [W]	1500	1840	2300	2500	3000	3750
Peak apparent power [VA] (130% overload)	1950,10s	2400,10s	3000,10s	3250,10s	3900,10s	4900,10s

2. For three-phase inverters, the output power of EPS ports is restricted to half (50%) of the nominal output power of EPS ports (with battery) total phase, but there are some differences about per-phase power. For more details in the Table2 below.

Table2. EPS output of X3-Hybrid G4 (without battery)

EPS output (without battery)	X3-Hybrid-5.0	X3-Hybrid-6.0	X3-Hybrid-8.0	X3-Hybrid-10.0	X3-Hybrid-12.0	X3-Hybrid-15.0
Nominal output power [W]	2500	3000	4000	5000	6000	7500
Per-phase power [W]	2500	3000	4000	5000	5000	5000
Peak apparent power [VA] (130% overload)	3250,10s	3900,10s	5200,10s	6500,10s	7800,10s	9570,10s

Notes:

①  If PV input power is sufficient, there will not be any trouble. But if PV input power is not enough, an “EPS Overload” will be reported on the LCD.

Advantages

Some customers install the hybrid inverter first as a string inverter (Battery Ready) and add the batteries later, now they can use the back-up without battery.

Configuration

Setting path

Main → Settings → Advance Setting → EPS Setting → Super-Backup

This function is Disable by default.

If users want to supply EPS  loads only with PV, just Enable it.

Compatibility

Hardware version

X1-Hybrid G4                                               X3-Hybrid G4

Software version

Requirement for X1-Hybrid G4:

ARM≥1.33                                                    DSP≥1.34

Requirement for X3-Hybrid G4:

ARM≥1.30                                                    DSP≥1.31