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Inverters change DC current from batteries or solar panels to 220V 50Hz alternating current (AC) as needed for appliances. The generated AC output is in a pure sine wave form that is identical to the grid AC. 

The Axpert-type inverters are considered to be hybrid inverters because they can charge batteries from the grid (Eskom) and from solar panels.

Model 5kVA/4kW 80A 5kVA/5kW 80A PLUS 5kVA/5kW 80A VICTOR
Rated power 5000VA/4000W 5000VA/5000W 5000VA/5000W
Parallel capability Yes, 6 units Yes, 9 units No
Voltage 230 VAC 230 VAC 230 VAC
Selectable voltage range 170-280 VAC (for personal computers)
  90-280 VAC (for home appliances)
Frequency range 50 Hz/60 Hz (auto sensing)
AC voltage regulation (Batt. Mode) 230 VAC± 5%
Surge Power 10000 VA
Efficiency (Peak) 93%
Transfer time 10 ms (for personal computers)
  20 ms (for home appliances)
Waveform Pure sine wave
Battery voltage 48 VDC
Floating charge voltage 54 VDC
Overcharge protection 60 VDC
Maximum charge current 80 A
Operate without batteries No Yes, if PV voltage > 150V
Maximum PV array power 4000 W
MPPT range @ operating voltage  60 VDC - 115 VDC 120 - 450 VDC
Maximum PV array open circuit voltage 145 VDC 450 VDC
Maximum charging current 80A
Maximum efficiency 98%
Standby power consumption 2 W
Dimension, D x W x H (mm) 140 x 295 x 540 100 x 300 x 400
Net weight (kg) 13.5 9.7
Humidity 5 to 95 % Relative humidity (non-condensing)
Operating temperature 0°C - 55°C
Storage temperature -15°C - 60°C