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- เผยแพร่เมื่อ 17 ธ.ค. 2023
- Don't even think about powering your whole house with a high frequency, transformerless inverter. The Chinese made inverters and solar generators on today's market (and they're ALL Chinese made) are not only short lived and offer a weak surge capacity when compared to conventional off grid low frequency, transformer based solar systems, they can also be dangerous.
You'd be lucky to get even two years of service from the overpriced inverters and solar generators that are currently on the market, especially when powering high inductance loads like full sized refrigerators, large power tools, portable AC units, air compressors or large microwave ovens.
The reason for this is that all these high frequency inverters lack a very critical component. That critical component is an iron core, copper wound output transformer. Without an output transformer to act as a buffer to absorb electrical surges provided by the “Flywheel Effect” inherent in the physical amount of a transformer’s iron, these surges and damaging reverse voltage spikes must be handled directly by the inverter’s MOSFET transistors, essential shortening their life.
You might be able to start and run some high surge loads when these solar generators are new, but every time you fire up one of those inductive loads, you're shortening the life of the MOSFETs in your solar generator's inverter.
Even the best high frequency inverters and solar generators run much hotter than low frequency, transformer-based solar generators which makes the low cost, off spec, Chinese made components such as capacitors, diodes, resistors, inductors, ICs and knockoff MOSFETs that are used in the cheap inverters that are used in these solar generators, far more prone to early failure.
Another major consideration with these high frequency, transformerless solar generators is safety. All it takes is for the AC output monitoring circuitry to fail and one of their MOSFETs in the inverter's H-Bridge circuit to short to ground, and these units will can dangerous, high voltage, high amperage DC current straight to your connected AC loads which will not only damage most AC appliances but can also set those AC appliances on fire.
Another consideration that is never mentioned by those youtube, solar generator hucksters, is that the vast majority of these solar generators are non-repairable. After the warranty runs out, you're not going to be able to ship these units back to the manufacturer in China and have them repair them. And at a typical shop rate of $125 per hour here in the US, with no schematic and limited parts availability, it won't makes economic sense to even attempt to repair one of these units. Once the FETs have fried and have burned a good portion of the inverter's PCB, (And trust me, sooner rather than later, they will fry.) they basically become a brick.
A far better alternative is to invest less money and purchase a hybrid, low frequency, transformer based inverter charger and an LFP battery and assemble your own, easy to build "real" solar generator.
Low frequency transformer based solar generators last many years longer than these toy high frequency inverters, and can easily power high surge loads without being damaged and without damaging your appliances. That's why the big name brand inverter manufacturers like Schneider Electric, Outback Power, Sigineer Power, Victron Energy and others, all use a low frequency topology in their offerings.
