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Does work well. My solar array is around 2.4KW @ 240VDC. I use a voltage sensitive relay and a thermo switch to sense battery bank volts and solar insolation. On hot days with battery above 95% the relay closes a DC SSR and connects the 240V hot water element directly across the solar array...

Yes, its' failure mode is to short circuit the gate to the drain, so it's prudent to have some sort of 'fuse' here. Most car audio amps have the exact same protection. Interested to hear your outcome with this, most likely a failed mosfet. I have unit on the bench to repair as well.

hey everyone Does anyone know if the commonly available Master+Slave configuration of Hybrid units supports failover? That is, if the master unit develops a fault, does the slave unit continue to operate? As in this setup https://www.aliexpress.com/item/33048358388.html Many thanks. S

You could have a separate load-disconnect, but you'd have two different load-disconnect settings. :/ If you have plenty of horsepower, just plug it into the mains.

Yes you can. Wire the stator through the rectifier diodes direct to the MPPT input, and run the voltage regulator sense wire direct to the battery.

The Kisse unit doesn't address the problem of the alternator running hot because its burning up half of its output as heat. Learn about kirchhoff's laws.