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Could someone advice if one is better than the other in terms of performance, durability and efficiency. I currently use a transformer based inverter at home to power most home appliances in the event of power outage. I am shopping to replace the current one but now have the choice of transformer-less ones. They come much lighter and more affordable. But are they as reliable?
And got the following answer:
From what I can gather, they have a higher efficiency, which would mean less internal power dissipation, which would increase reliability. However they have a lot more parts, which could decrease it. From reference: The largest recent shift in inverter technology is the availability of transformerless inverters in the United States. They have long been popular in Europe, but now most inverter manufacturers have added a transformerless option to their existing inverter line. Without a heavy transformer, they weigh about 50% to 70% less than a transformer-based inverter of similar output, and the size of the inverter housing can be (but isn’t always) reduced. Inverter efficiency is also increased—there are no longer losses associated with having a transformer to step up the voltage. And because the transformer (which is comprised of copper windings on an iron or steel core) is eliminated, they are less expensive to produce. However, transformerless inverters are not without some drawbacks. They require the DC wiring to be ungrounded. Because neither the positive nor negative conductor is connected to ground, they must meet more NEC requirements, per NEC 690.35, including the use of PV wire (a double-insulated single conductor cable having added sunlight and mechanical protection) for exposed wires (i.e., module interconnects and exposed home run wiring). Overcurrent protection and disconnect devices are required on both the positive and negative conductors, since they are both ungrounded. Arrays that require the positive conductor be grounded (those using SunPower modules, for example) are not recommended for use with transformerless inverters, because the array must be ungrounded.