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- เผยแพร่เมื่อ 2 ก.พ. 2024
- Don't even think about powering your whole house with a Chinese made solar generator. The Chinese made solar generators on today's market (and they're ALL made in China) are not only short lived and weak when compared to conventional off grid solar systems, they can also be dangerous. You'd be lucky to get even two years of service from these overpriced solar generators, especially when powering high inductance loads like full sized refrigerators, large power tools, portable AC units 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 "whole house" 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. It's a fact that high frequency 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 and ICs that are used in these solar generators, far more prone to early failure. Another major consideration with these so called whole house, high frequency, transformerless solar generators is safety.
All it takes is for the AC output monitoring circuitry to fail and one of the MOSFETs in the inverter's H-Bridge circuit to short to ground and these units can send 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 the transformers and other components in these AC appliances on fire.
Another consideration that is never mentioned by the hundreds of youtube, solar generator hucksters, is that the vast majority of these solar generators are non-repairable. After the warranty runs out, most consumers will not be able to afford the high cost of shipping these heavy units back to the manufacturer in China to have them repaired. And at a typical shop rate of $125 per hour here in the US, with no schematic and limited parts availability, in most cases, 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.
If you want to power your whole house or just a few appliances with solar, 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 real solar generator. Low frequency transformer based solar generators last many years longer than these toy high frequency solar generators, 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. I know this to be true because I've spent the last 24 years repairing inverters. High frequency solar generators/inverters simply don't last when powering inductive loads, they provide low surge capacity and can set your appliances, van, EV and even your home on fire.
