You can run direct, but you will not be getting as much heat out of the coils in the morning and evening and partly cloudy days. The MPPT tunes the energy for optimal use with the coil just like the MPPT does for a battery. If the voltage coming in does not match the ohms of the load it just does not work very well… I found this out by testing various solar panel configurations with my heating coils, also if you watch David Poz on youtube he shows why you have to match the panels to the ohms of the heating coil for optimal results.
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