50Hz/ 60Hz (Auto detection). 47±0.3Hz 55±0.3Hz (50Hz)/ 57 ± 0.3Hz 65±0.3Hz (60Hz). Overload/ short circuit protection. Conversion time (bypass & inverter). Maximum bypass overload current. Rated output power (VA). Rated output power (W). Rated output voltage (Vac). Output frequency range (Hz). 50Hz ± 0.3Hz/60Hz ± 0.3Hz. 125% ± 10%: 5 seconds. Output short circuit protection. Rated battery input voltage. 24V (Minimum starting voltage 22V). 20.0Vdc33Vdc ± 0.6Vdc Undervoltage alarm/ shutdown voltage/ overvoltage alarm overvoltage recovery… Settable on LCD screen. Lead acid or lithium battery. Circuit breaker and blown fuse. Alarm and turn off charging after 1 minute. Maximum PV open circuit voltage. PV operating voltage range. PV charging current range (can be set). Charging short circuit protection. CE(IEC/EN62109-1,-2), ROHS2.0. 5% to 95% (Conformal coating protection). Forced air cooling, variable speed of fan. USB/ RS485(WiFi/ GPRS)/ Dry node control. ? Packing list: 1 24V 4KW Inverter 1 Manual EN A packet of accessory screws Package Weight: 8.5? Kg (18.74? Lbs) Dimensions: 46×31×15? Cm (18.11 × 12.20 × 5.91 in). Can it be powered without AC power? Reply: Yes, it can be powered without AC power; AC power is optional. Without AC power input, the solar panel and battery (24V) can power the inverter. Can the inverter be started without a 24V battery? Reply: Yes, the inverter can be started with both solar panel and AC power. Can the inverter output split-phase power (240VAC)? Reply: No, it can only output 100/110/120VAC, and it can only be used as a standalone unit.