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Technical comparison between Low Frequency VS high Frequency Inverter

For those unaware, the purpose of an off-grid inverter is simple, yet essential for anyone looking to set up an off-grid or backup power system, including solar-powered systems. Inverters convert the DC power stored within a battery (direct current, 12V, 24V, or 48V)into AC power (alternating current, 230-240V) that can be used to run your household items and electrical appliances, from fridges to televisions to mobile phone chargers. Inverters are an essential item for anyone without access to the main power source, as they can easily provide a plentiful amount of electricity. 

Inverters come in many different shapes and sizes and vary in various ways. There are two main contrasting characteristics between different types of off-grid inverters: 

• The type of power output, categorized by which sine wave it uses – modified or pure sine wave. We produce only pure sine wave inverters, which are more efficient and have a broader range of suitable appliances they can power, compared to modified sine wave inverters. 

• What internal frequency the inverter circuits operate at – low frequency or high frequency (not to be confused with AC power output frequency which is a standard 50Hz for our inverters). 


Low-frequency inverters have the advantage over high-frequency inverters in two fields: peak power capacity and reliability. Low-frequency inverters are designed to deal with higher power spikes for longer periods of time than high-frequency inverters. Power spikes can occur for a number of reasons (e.g. devices like power tools, pumps, vacuum cleaners and other appliances with electric motors require high starting power); when inverters experience such spikes, they can endure the increased power for a short period of time before shutting down in order to prevent any damage being done to them. Low-frequency inverters have much greater peak power capacity to handle large loads with power spikes than high-frequency inverters. In fact, low-frequency inverters can operate at the peak power level which is up to 200% of their nominal power level for several seconds, while high-frequency inverters can operate at 150% power level for a small fraction of a second. The second main difference is reliability: low-frequency inverters operate using powerful transformers, which are more reliable and sturdy than the high-frequency inverter’s MOSFETs, which use electronic switching and are more prone to damage, particularly at high power levels. 

In addition to these qualities, low-frequency inverters come with a wide range of technical features and capabilities that most high-frequency inverters lack; these include a built-in battery charger; UPS (Uninterruptible Power Supply) functions; by-pass mode various charge settings (like different battery types and charging voltages). 

In terms of other differences, low-frequency inverters can sustain verse grid inputs conditions, like voltage fluctuations, high voltage spikes, and lightning. But high-frequency inverters cannot sustain the same. 

Serviceability is an important challenge for the inverter industry; in high-frequency inverters a lot of electronics components with complex design circuits in case of inverter failure you have to replace complete electronics PPCB, which cost is approx 80% of the new inverter. But with the transformer-based (Low-Frequency inverter) inverter's designs are much simple and easily repairable. Any technician can repair at the component level if in any verse case need to replace electronics PPCB with new PCB that cost will be not much more approx 30-40% of new inverter. 

Low-frequency inverters are not ideal for everyone; they’re very large and are considerably heavier than high-frequency inverters, and would be best suited for those who either are building an off-grid power system with no significant power restrictions or who run powerful appliances and devices with electric motors like power tools, washing machines, vacuum cleaners, and air conditioners. Low-frequency inverters are also best suited for those who want to power various kitchen appliances such as refrigerators, microwaves, dishwashers, and ovens. 
Enhanced peak performance capacity and improved reliability of low-frequency inverters mean that they cost more than high-frequency inverters. If you do not consume a lot of energy and you only have small appliances that you need to power, or you have limited space for an inverter, then a high-frequency inverter would be more suitable for you. 

Low-frequency inverters remain a fantastic investment for anyone who has a lot of powerful electrical appliances in a place with limited or no access to standard electricity. Coupled with a suitable solar power kit, low-frequency inverters can not only provide a reliable backup power solution but completely replace conventional electricity with the same quality power supply. The price you would pay for a low-frequency inverter over a high-frequency inverter should be considered a long-term investment, given how unlikely the low-frequency inverter is to break down. They are indeed bigger, stronger, and tougher.