Why Choose Low Frequency Heavy Duty Inverter/UPS

The low-Frequency Heavy Duty inverter/UPS/ Solar PCU are reliable products as the isolation transformer is built-in to handle external problems like high and Low voltages, Spikes and surges.

Low-frequency heavy-duty inverters have advantages over high-frequency inverters in peak power capacity and reliability. Low-frequency inverters are designed to handle higher power peaks longer than high-frequency inverters. So if one has to run high peak motors or machinery like CNC machines or central air conditioning plants or running a complete building or factory, then the low frequency based inverter/UPS is the only solution.https://www.sciencetimes.com/articles/42696/20230306/understanding-the-difference-between-low-frequency-and-high-frequency-inverters.htm#:~:text=In%20conclusion%2C%20low%20frequency%20and%20high%20frequency%20inverters,compact%2C%20making%20them%20suitable%20for%20powering%20electronic%20devices.

High capacity inverter 100KVA with lithium battery bank

Heavy-duty UPS with Lithium battery bank


According to the spectrum distinction table prepared by the Institute of Electrical and Electronics Engineers (IEEE), the low frequency is 30~300kHz, the middle frequency is 300~3000kHz, and the high frequency is 3~30MHz. The frequency plan in 30~300MHz is VHF, and in 300~1000MHz is UHF. Compared to the low-frequency signal, the high-frequency signal changes quickly and has sudden changes; the low-frequency signal changes slowly, and the waveform is smooth. This is why the THD in Low frequency is not very good for the smooth waveform. The THD of low-frequency inverter/UPS is very low compared to the high-frequency inverter/UPS.

Low-frequency inverters can operate at peak power levels for several seconds. This power level is up to 300% of its rated power level, while the high-frequency Inverter can use at 200% power level for a fraction of the time, which can be a game changer for the heavy-duty Inverter or high-capacity 3 Phase inverter/UPS


The second main difference is reliability: low-frequency Heavy duty inverters/UPS operate with powerful, more reliable and robust transformers than the IGBT/MOSFETs of high-frequency inverters. The latter use electronic switches more prone to damage, especially at high power or voltage variations.

3. Isolation transformer

A major challenge is the isolation between Neutral and line which becomes a major factor of failure in High frequency based Heavy Duty Inverters/UPS/Solar hybrid PCU. The isolation is very poor in high-frequency-based inverters/UPS. In Low frequency based Inverter/UPS/Solar hybrid PCU there is an isolation trand=sformer which is very heavy in weight and keeps the isolation so that the failure is averted during the charging.

4. the Overload and short circuit

are different in low-frequency and high-frequency heavy Duty inverter/UPS/Solar Hybrid PCU as the Low-frequency Overload retries are given, Short circuit also retries are given, and Short course is kept at 300%, which is very tough to maintain in the low-frequency Inverter/UPS

5. life span

life of the low-frequency heavy Duty 3 phase  Inverter/UPS/Solar hybrid PCU is very high compared to the low-frequency inverter/UPS as the switching happens at a very high frequency in the capacitors and Mosfets etc., so the life of the components is shortened. In contrast, the low frequency has a transformer, and the switching happens at a lower frequency, so the life is unlimited. I have experience with Su-kam, where we made inverters 25 years back. They have no problem and working without any faults till today because of the built-in transformers.

6. Bluetooth or Wi-Fi Heavy-duty UPS or High capacity inverter to monitor and control the Heavy Duty UPS or high capacity Inverter


Low-frequency Heavy duty inverters/UPS are very successful in countries or areas where the power is unstable, with fluctuating power and long power cuts. The high-Frequency High capacity inverters/UPS are successful in countries or regions with stable management and hardly any long power cuts: low-frequency heavy capacity 3 phase inverters/UPS are good for running higher loads like Air conditioners, motors, CNC machines, etc.https://suvastika.com/high-frequency-based-inverter-ups-or-transformer-based-inverter-ups-which-one-is-better/

The increased peak performance capability and reliability of low-frequency inverters means they cost more than high-frequency inverters. If your energy consumption is small and only small appliances need to be powered or have limited space to place the Inverter, a high-frequency inverter would be better for you.

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