Perhaps the problem is that I'm the kind of person who looks at something and says, "I wonder what other way I could use it?" I personally have wired up a waterbed heating mat through a solid state relay and thermostat to my solar panels (at MY risk) to keep my LiFePo4 battery bank warm in wintertime charging conditions. It absolutely kills output power from the MPPT (which is automatically switched off via MODBUS until the bank warms up above freezing)...but it gets the job done.
As you pointed out earlier, OP is well over the maximum input voltage of the inverter anyway (likely the cause for the audible buzzing)...and if the warranty is already void, well...enough of my reasoning

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