oh my yes, it would be a shame to loose the extra energy, I produce much more then my batteries can absorb. so a diversion is needed. I don't know anything the Miss controller, if you even have the option of bypassing the controller, that is shutting down the solar. I have always used Midnite solar, the classic line of charge controllers.
Diversion loads
1. Resisters of your voltage, they are glorified heaters, I purchased from windynation.
2. Water heater elements, for the voltage you have. I think this is the best.
3. You could even use baseboard heater this you must read up on.
With the charge controller's of today such as midnite solar there are aux ports where you can add solid state relays, these aux ports are 12v so you need a relay, that the coil is 12v the other side of the contactor using ac power from inverter. I think your solid state controller coil needs to be about 200ma. you can also use a solenoid again 12v controlling, then diversion load side using same voltage as the battery bank. such as mine of 24v. using this method this is a better conversion, due to not needing a inverter.
You can also use a pwm controller such as xantrex c60 as a diversion controller. If you run a turbine you already do this.
in short YES, don't waste the energy.
