Common issue with these large LF toroid transformer designs is the mounting straps. Gentry and Powerjack inverters have this arrangement.
If the center bolt makes contact to the perimeter metal support straps you get a short circuit secondary side turn on toroid transformer made of conductive straps, center bolt, and metal case. This causes a massive inverter DC input current that can blow out MOSFET's on primary side.
When this happens, overcurrent protect on AC side current sensors are not in short circuit load path so they will not shut down inverter to protect it. Not many inverters put independent primary side MOSFET overcurrent sensing protection, other than temp sensors on their heat sinks, so DC input breaker is last line of defense, which if it pops is usually after the MOSFET's are already destroyed.
It is better to have an isolated center support cup without perimeter straps to short out for mounting of toroid transformer.
Whether LF or HF inverters, poor quality designs on either will dominate results.
As to solid design and good quality, I would rate Victron(LF), SMA(LF), Xantrex(LF), and Outback(LF) on the top of the list. SolArk(HF), Magnum(LF) in middle. AIMS(LF), MPP Solar(HF), Growatt(HF), and Powerjack(LF) near bottom of list. A lot of HF inverter clones are very poor quality.
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