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- เผยแพร่เมื่อ 8 เม.ย. 2024
- Sure you can charge your EV with one of those budget brand, Chinese made, high frequency, transformerless inverters, but not for very long before you fry your EV's onboard charger and void your EV's warranty.
High frequency, transformerless inverters have much shorter life expectancies and a poorer surge capacity capacities than more reliable, heavy duty, low frequency, transformer-based inverters. And because there's no transformer in these inverters, there's no galvanic isolation between the DC boost stage of the inverter and the AC output which makes for far less safe operation when charging EVs. During a catastrophic failure of the H-bridge circuit and the AC output monitoring circuitry, high amperage DC current can pass through to an EV's onboard charger and not only damage the charger but also void the EV's warranty.
The high frequency technology that's used in all larger high frequency inverters is basically the same tech that's used in the Ecoflow portable power stations. Click here to learn how you can damage sensitive electronics when powering high inductance loads like power tools with any high frequency, transformerless inverter. • I ticked off a sponsor
If you want to install a high frequency inverter for your home with solar panels, click here to learn why some high frequency inverters are not legal to install. "6000xp is not UL9540 certified. YOU CANNOT LEGALLY install in the US along with solar panels." • 6000xp is not UL9540 c...
For a more detailed explanation regarding the use of high frequency inverters for charging an EV, please watch Solar Inverter Catastrophic Failure:
• Solar Inverter Catastr...
The high frequency technology that's used in all larger high frequency inverters is basically the same tech that's used in the Ecoflow portable power stations. Click here to learn how you can damage sensitive electronics when powering high inductance loads like power tools with any high frequency, transformerless inverter. • I ticked off a sponsor
For just a few hundred dollars more, you can buy a low frequency, transformer-based inverter charger with MPPT which provides a much higher surge capacity, a built in AC transfer switch, grid or generator battery charger with automatic generator start and a much longer life expectancy with galvanic isolation.
Without an output transformer to act as a buffer to absorb the 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 MOSFETs or IGBTs, essentially shortening their life. You might be able to charge your EV when these high frequency inverters are new, but every time you do, you're shortening the life of the MOSFETs or IGBTs in these inverters. To make things even worse, lightweight, high frequency inverters run much hotter and their internal components are far more stressed due to their high switching speeds and use of high voltage components.
Another consideration that is never mentioned by the TH-cam high frequency inverter affiliate salespeople, is the fact that the vast majority of these inverters 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 make 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 much better choice would be to invest in a UL-1741 listed all-in-one inverter and a bank of LFP batteries that uses low frequency, transformer based technology in its design. Low frequency inverters can handle high surge loads for at least 3x (300%) their continuous rated capacity and they can do this repeatedly, without sustaining damage to their MOSFET transistors, for minutes, rather than the milliseconds that a high frequency inverter offers and they offer galvanic isolation to keep your EV's on board charger safe during charging. That's why the big name brand inverter manufacturers like Schneider Electric, Outback Power, Sigineer Power, Magnum Energy, Victron Energy and others, all use a low frequency topology in their design.
