This inverter runs on 24 DC and outputs 120 AC 3000W. 
When 120 AC is supplied to the back of inverter this will operate as a 24V charger and automatically switch output from the DC 24 V to the AC 110. When the AC power in the back is disconnected it will operate as normal inverter converting 24V DC to 110 AC

Dimension(mm):396x180x128mm
Input voltage range: 20- 31V
Low voltage alarm: 21V 
Low voltage protection: 20V
Over voltage protection: 31V

Protection function
Low voltage
Alarm at first, voltage continously reduce. LED Red light on & shut sown.
Over voltage
LED Red light on, shut down
Over load
LED Red light on, shut down
Over temperature
Alarm at first, tempurature continously rise.LED Red light on & shut sown
Short circuit
LED Red light on
Input reverse polarity
Fuse burn-out
Working temperature
-10°- +50°
Storage temperature
-30°- +70°
Dimension(mm)
397x180x78mm
Packing(mm)
500x240x150mm
Net./gross weight(g)
4100/4500g
QTY/Ctn
4 Pcs
Meas./Ctn(mm)
510x490x315mm
Gross weight/Ctn(g)
18200g

Cooling method
Intelligent air cooling