3500 Watt Pure Sine Wave UPS Inverter

Cost-effective 3500W uninterruptible power source inverter for sale online, with pure sine wave, DC input voltage can select 12V, 24V, 48V, input current 20A, 10A, 5A. Automatically switch with a ultra-fast switching time. Powering pc, phone and digital camera. Switch-mode design in 3.5KVA UPS inverter, it is easy to use.
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Pure sine wave ups inverter with 3500 watt (3.5KVA) and uninterruptible power supply. It provides over load, over temperature, over voltage, low voltage and short circuit protection. In order to prevent the inverter from being burned out, there is input reverse polarity protection.


  • UPS inverter with pure sine wave output (THD<3%)
  • 3500 watt UPS inverter built-in 3-stages battery charger, allow to run loads while charging.
  • Automatically switch with a ultra-fast switching time.
  • 3.5KVA UPS inverter has 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.
  • USB charging port: 5V, ideally qualified for powering your phone, laptop, pc, etc.
  • LED indicators for power and protections.
  • Switch-mode design in 3.5KVA uninterruptible power supply inverter, easy to use.
  • Intelligent fan for cooling, long use life.

Parameter List:

Model ATO-UPSI-3500
Rated power 3500W (3.5KVA)
Peak power 7000W
Input voltage range DC 12V DC 24V DC 48V
Output voltage 100VAC or 110VAC or 120VAC
Unload current less than 0.4A 0.3A 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) 450*180*130
Packing (mm) 550*280*220
Net. / gross weight (g) 7800/9100
QTY / Cth 2Pcs
Meas.Ctn (mm) 570*300*270
Warranty 12 months
Cooling method Intelligent air cooling

Pure Sine Wave UPS Inverter Output Sockets (Optional)

UPS inverter socketsApplication:

UPS inverter application

Tips: Types of UPS

  • Passive backup ups power supply. It refers to the inverter connected in parallel between the mains and the load is simply used as a backup power source. This kind of UPS power supply, when the mains is normal, the load is completely and directly municipal power supply, the inverter does not do any power conversion, the battery is powered by an independent charger. When the mains is abnormal, the load is completely supplied by the inverter.
  • Online interactive ups power supply. It refers to the inverter connected in parallel between the mains and the load, play the role of backup power supply, while the inverter as a charger to charge the battery. The reversible operation of the inverter interacts with the mains, so it is called interactive. This kind of ups power supply, when the mains is normal, the load by the improved mains power supply, and the inverter as a charger to charge the battery, at this time the inverter plays the role of AC/DC converter; When the mains fails, the load is completely powered by the inverter. At this time, the inverter acts as a DC/AC converter. The online interactive ups has the advantages of simple structure, convenient implementation, easy parallel connection, easy maintenance and repair, high efficiency, low operating cost, and high reliability of the whole machine. The performance meets some load requirements, especially suitable for the distributed power supply system of some computer equipment in the network.
  • Double transform ups power supply. Double transform ups is the main product of ups power supply. It has the advantages of good performance, high voltage stability and frequency stability, strong function, hot backup connection and parallel redundancy connection. Its deficiency is that when the capacity is less than 10kVA below, the efficiency of the whole machine is not high, generally about 85%.
Existing reviews
Perfect combination of pure sine wave and ups
I am most satisfied that this 3500W inverter is a ups inverter. Perfect combination of pure sine wave and ups. I use the 3500W pure sine wave ups inverter about twice a month. So far, there have been no problems with the inverter.
Chobe Edward | 6/20/2022 3:29 AM
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Working great
It works great for what I need, I might up grade to larger inverter for added uses I may have in my commercial vehicle. I am very satisfied with this ups inverter and completely recommend this product.
Humphrey Edward | 1/10/2022 1:37 AM
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Very useful
I have used it for about three weeks now and haven't had any problems whatsoever. This pure sine wave ups inverter seems to be working just fine so far. I'm very happy with this purchase. Very useful!
Wayne Smith | 11/11/2021 1:45 AM
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