Welcome to Yitai Tech: Here you can find all the Inverters with charger and automatic switch(UPS inverters). And there should be one or more fit to your needed.

Specification:
YTM-350C-UPS with meter inverter with charger and automatic switch and meter(UPS function)
Continuous power 350W
Max power 450W
Peak power 700W
Input volt 12VDC/24VDC
Output volt 100/110/120VAC/220 /230 /240VAC
Frequency 50 / 60Hz
Efficiency 90%
No load current draw <0.3A
LED indicate volt & load LED indicate the in/out put voltage
LED indicate power LED indicate output power
Output waveform Modified sine wave
Voltage meter: Indicate DV/AC voltage

Automatic protection Overload, Short circuit, Overthermal, Fuse, low/Over Volt
Switch time below 10ms
Battery charge (can charge to storage battery) Input: 110VAC/220VAC
Output: 12V8A/24V5A
Can switch automaticlly when power off
Packing Details:
Unit size: 230*150*70mm
Box size: 355*196*110mm
Carton size: 400*365*235
G. W: 8.8kg/4PCS