300 Watt Pure Sine Wave UPS Inverter

High efficiency 300W pure sine wave ups inverter with a good price for sale, DC input voltage can select 12V, 24V, 48V, with uninterruptible power source, output frequency 50Hz or 60Hz, ups inverter with short circuit and over temperature protection.
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300 watt (330VA) pure sine wave ups inverter with charging, 12V, 24V, 48V DC input voltage can be selected, high efficiency and lightweight sine wave inverter worth buying.


  • UPS inverter with pure sine wave output (THD<3%)
  • Built-in 3-stages battery charger, allow to run loads while charging.
  • Automatically switch with a ultra-fast switching time.
  • Pure sine wave ups inverter uses soft-start technology.
  • High efficiency-converts the battery’s available power.
  • 90% pure sine wave output, low distortion, waveform and main power line AC waveform are basically the same, equipment accuracy is small, low interference, low noise, strong load capacity, can meet any type of AC load, without damaging the load.
  • Aluminum shell with good heat dissipation and strong shock resistance.
  • Optional crocodile clip and cigar lighters, easy to connect batteries or vehicles' batteries.
  • Uninterruptible power supply with USB charging port: 5V, ideally qualified for powering your phone, laptop, pc, etc.
  • LED indicators for power and protections.
  • Switch-mode design in 300 watt ups inverter, easy to use.
  • Intelligent fan for cooling, long use life.

Parameter List:

Model ATO-UPSI-300
Rated power 300W (330VA)
Peak power 600W
Input voltage DC 12V DC 24V DC 48V (if you want, please contact us)
Output voltage 100VAC or 110VAC or 120VAC or 220VAC or 230VAC or 240VAC±5%
Unload current less than 0.3A 0.2A 0.2A
Output frequency 50Hz±0.5Hz or 60Hz±0.5Hz
Output waveform Pure Sine Wave
Power switching time ≤ 9 ms
Phase 1- Phase (L, N, G), Do Not provide split phase configuration (L1, L2 + N, G)
Waveform distortion THD<3% (Linear load)
USB port 5V 1A
Max.efficiency 90%
Input current 20A 10A 5A
Input voltage range 10-15.5V 20-31V 40-61V
Low voltage alarm 10.5±0.5V 21±0.5V 42±1V
Low voltage protection 10±0.5V 20±0.5V 40±15V
Over voltage protection 15.5±0.5V 31±0.5V 61±1V
Low voltage recover 12.3±0.5V 24±0.5V 48±1V
Over voltage recover 14.8V±0.5V 29.5V±0.5V 59V±1V
Low voltage Alarm at first, voltage continuously reduce. LED red light on and shut down
Over voltage LED Red light on, shut down
Over load LED Red light on, shut down
Over temperature Alarm at first, tempurature continuously rise. LED red light on and shut down
Short circuit LED red light on
Input reverse polarity Fuse burn-out
Working temperature —10 ℃—+50 ℃
Storage temperature —30 ℃—+70 ℃
Dimension (mm) 308*135*78
Packing (mm) 360*215*90
Net. / gross weight (g) 2350/2800
QTY / Cth 8Pcs
Meas.Ctn (mm) 470*430*310
Warranty 12 months
Cooling method Intelligent air cooling

Pure Sine Wave UPS Inverter Output Sockets (Optional)

UPS inverter sockets


UPS inverter application

Tips:Pure Sine Wave VS Modified Sine Wave

The pure sine wave output is equal to or better than our grid power. Different inverter manufacturers may use different terms, which mean the same thing, like true or full sine waves. As you can see in the figure below, 120VAC pure sine wave voltage rises evenly at the smooth phase angle and decreases evenly at the smooth angle. When it passes through 0V, its polarity also changes immediately.

Form of pure sine wave

With the modified sine wave, the voltage rises and falls sharply. The angle of the phase is not smooth and can change suddenly, causing the waveform to look much like a staircase. The modified sine wave also briefly stays at 0V before changing polarity. You cannot get an accurate voltage reading with a standard voltmeter, you must use a "True RMS" meter to read the modified sine wave.

Form of modified sine wave

Existing reviews
Love this ups inverter
Love this ups inverter. I power macbook and various electronics in my van conversion. I choose this 300W pure sine wave ups inverter because I want to make sure I had clean, high quality power to ensure the safety of my equipment.
Ahugy White | 1/12/2023 8:24 PM
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Works well
Once setup this 300W ups inverter works well. I switches without a noticeable glitch when the AC power goes off. This appears to be a well made device that functions as advertised. I will recommend this ups inverter to my friends.
Holley Edwin | 11/17/2022 8:53 PM
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So happy with this 300W ups inverter
Purchased this 300W pure sine wave ups inverter for our camping and received it on time. It was well-packaged. So happy with this inverter during the camping as it works great. So far I have this item for 2 months and works as usual. Good!
Glenda Johnson | 10/25/2022 1:28 AM
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Really like this 300W ups inverter
I found this ups inverter after a long search. I really like this ups inverter. 300 watt is enough for me. I will continue to buy from
Edwin Smith | 8/9/2022 2:28 AM
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Charge my phone and tablet
High quality ups inverter. I took this 300W ups inverter on a camping trip. It's very practical and helps charge my phone and tablet. Highly recommended!
Bruce Adam | 7/20/2022 7:00 PM
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High quality 300W pure sine wave ups inverter
The quality of this 300 watt pure sine wave ups inverter is very good. It came into its own last week when our electricity went out. Thanks to this pure sine wave ups inverter my work is not affected. Highly recommended!!
Ahugy White | 6/17/2022 2:36 AM
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300 watt pure sine wave inverter that satisfies me
I received this 300 watt pure sine wave inverter and tested it. I am very satisfied with it and will buy it again.
Margaret Margaret | 1/6/2022 1:41 AM
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Really happy with this ups inverter
It seems to do a great job supplying AC to the RV and keeping the battery's charged. I've been really happy with this pure sine wave ups inverter, it's work very well so far no problems.
Seamus Davis | 11/10/2021 1:22 AM
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